and
-Pinene Oxides over Binary Oxide Catalysts of Alumina-Rare Earth Oxides
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Articles
General and Physical
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and
-Pinene Oxides over Binary Oxide Catalysts of Alumina-Rare Earth Oxides
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-Carrageenan by Molecular Mechanics and Molecular Dynamics Simulations
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and
Setsuko Nakagawa
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Martyn C. R. Symons,*,
and
Jane L. Wyatt
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Hisao Tsutsumi, and
Kaoru Tsujii
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Hiroko Shimada,*
and
Ryoichi Shimada
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Articles
Analitical and Inorganic
=============================
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-Diketon Mixed-Ligand Systems
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-Amido-
-hyperoxo-dicobalt(III) Complexes with Ammine and Polyamine Ligands in Aqueous Solutions:
Effects of Ligand and pH
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,
'
-diyl Group as an
2
(
C
,
N
) :
3
(
C
,
C'
,
N
)-Bridging Ligand
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Orgainc and Biological
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and
Mitsuo Hayashi
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Yoshinori Tanaka,
Seiji Taniguchi,
Tadashi Okada,
Iwao Yamazaki,
and
Yoshinobu Nishimura
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and
Katsumi Tokumaru*
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-Ethylidenecycloalkanones to
-Alkylidenecycloalkanones Induced by Trimethylstannyllithium/Aldehyde Equivalents/Lewis Acids
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and
Naoka Utsumi
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-Hydroxy Carboxylic Acid Containing Octaether Linkages as a Synthetic Analog of Natural Carboxylic Acid Ionophores through an Organic Liquid Membrane
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Hitoshi Kuboniwa,
Satoru Nagami,
Toru Bando,
Akira Hirao,
Seiichi Nakahama, and
Noboru Yamazaki
-Radicals of Carbonyl Compounds from the
-Stannyl Derivatives and Their Reactions with Electron-Rich Olefins
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and
Saburo Aimoto*
-[Phenyl(or Methyl)seleno]alkyl Aryl Ketones with Metal Hydrides
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,
-Diketo Esters.
A Novel Strategy for the Synthesis of Artificial HMG-CoA Reductase Inhibitors
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Articles
Applied and Materials
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Kohji Yoshinaga,
Youichi Ishihara,
Michio Komatsu,
and
Hiroyasu Nishida
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Copyright (C) 1995 The Chemical Society of Japan
=============================
Accounts
=============================
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 1-16 (1995) [Vol. 68, No. 1, January, 1995]
Microwave and/or infrared spectra of alkali monoxides and NO3 were observed to characterize these molecules in detail, which play significant roles in atmospheric chemistry. Similar studies were carried out on a few inorganic molecules, including Sin Hm neutrals and ions with n=1 , 2 and m=1 , 2, 3, in view of their important roles in electronic-device processing. Recent innovations in high-resolution spectroscopic methods are briefly discussed.
LiO , NaO , KO , RbO , CsO , NO3 , SiH3 , SiH2 , LiBH4
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 17-35 (1995) [Vol. 68, No. 1, January, 1995]
Recent advances in aerobic oxygenations of olefins using transition-metal complex catalysts are reviewed. Main topics are focused on cobalt(II)-complex-catalyzed oxygenation of olefins, nickel(II)-complex-catalyzed aerobic epoxidation, enantioselective aerobic epoxidation using chiral manganese(III) complex catalysts, aerobic Baeyer-Villiger oxidation and direct oxygenation of aromatic compounds.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 36-55 (1995) [Vol. 68, No. 1, January, 1995]
The second-order stereoselective synthesis via dynamic kinetic resolution (DKR) of chirally unstable racemic substances presents a viable strategy for the access to chiral compounds of high enantiomeric purity. BINAP-Ru catalyzed hydrogenation of
-substituted
-keto esters via DKR has been quantitatively analyzed.
=============================
Headline Articles
=============================
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 56-61 (1995) [Vol. 68, No. 1, January, 1995]
Enzymatic ring-opening polymerization of macrolides was carried out by using lipase catalyst to produce a polyester. The polymerization of the macrolides proceeded much faster than that of 
-CL. This tendency was opposite to the ring-strains and to the anionic polymerizabilities of these cyclic monomers.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 62-83 (1995) [Vol. 68, No. 1, January, 1995]
Ruthenium phosphine complexes, e.g., Ru(H)2 (CO)(PPh3 )3 , catalyzed the addition of ortho C-H bond in aromatic ketones to olefins with unprecedented degree of efficiency and selectivity. This C-H/olefin coupling is applicable to a wide range of olefins and aromatic ketones. In many cases, the coupling products were obtained in excellent yields.
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=============================
Articles
General and Physical
=============================
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 84-88 (1995) [Vol. 68, No. 1, January, 1995]
All catalysts used in the study produced two chemical shifts in 27 Al NMR spectrum. One around 60 ppm for tetrahedral coordination of aluminium. The other chemical shift around 10 ppm can be attributed to octahedral coordination of aluminium.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 89-94 (1995) [Vol. 68, No. 1, January, 1995]
and
-Pinene Oxides over Binary Oxide Catalysts of Alumina-Rare Earth Oxides
Among the various binary oxides Al2
O3
-Eu2
O3
and Al2
O3
-Nd2
O3
are found to be best catalysts for
-pinene oxide isomerization. 2,2,3-Trimethylcyclopentene-1-acetaldehyde and trans
-myrtanal, the major products obtained from
and
-pinene oxides have perfumery value.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 95-106 (1995) [Vol. 68, No. 1, January, 1995]
-Carrageenan by Molecular Mechanics and Molecular Dynamics Simulations
and
Setsuko Nakagawa
The conformational behavior of
-carrageenan was investigated by using molecular mechanics and molecular dynamics simulations. The stability of single and double helical conformers elucidated is discussed in terms of the electrostatic and van der Waals forces.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 107-119 (1995) [Vol. 68, No. 1, January, 1995]
Mechanical mixtures of supported catalysts, namely MoS2
, 
-Al2
O3
and CoS/C, and unsupported CoMoS phase and Co9
S8
evidenced that both hydrodesulfurization of thiophene and hydrogenation of cyclohexene are enhanced as compared with single phase. The remote control mechanism through hydrogen spillover allows to explain the activity of these supported catalysts.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 120-122 (1995) [Vol. 68, No. 1, January, 1995]
Ab initio calculations with a truncated basis set for lithium were carried out to elucidate the molecular structure and the 1JCLi value for trichloromethyllithium. 1a was predicted for the structure observed by NMR spectroscopy, although previous calculations have shown 1b and 1e to be more stable.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 123-127 (1995) [Vol. 68, No. 1, January, 1995]
1,3 : 2,4-Di-O -benzylidene- D -sorbitol ( D -DBS) can cause gelation of the organic solvents into gel state. we discuss about the changes of the texture, structure of the gel, and the aggregated structure of D -DBS depending upon the polarity of solvents.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 128-134 (1995) [Vol. 68, No. 1, January, 1995]
The Raman noncoincidence effect in the S=O stretching band of liquid DMSO is simulated. The calculated sign and magnitude of the Raman noncoincidence are in reasonable agreement with the observed. The large Raman noncoincidence is explained by the liquid structures obtained without specific interactions involving the hydrogen atoms.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 135-139 (1995) [Vol. 68, No. 1, January, 1995]
The microviscosity increased with the growth of the micelles, it changed at the sphere to rodlike micelles transition point, and it became constant at the overlap point of micelles, that is, the overlapping of micelles did not influence the microviscosity. Phase diagrams of the micellar solutions were determined from these data.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 140-145 (1995) [Vol. 68, No. 1, January, 1995]
Martyn C. R. Symons,*,
and
Jane L. Wyatt
The ESR spectrum of the t -butyl radical exhibits 19 lines at 6.6 K, which indicates that the hyperfine interaction removes the degeneracy in the internal rotational states of the methyl groups. The relative intensities of the lines provide information on the interaction between the methyl groups, while the temperature dependence of the spectra gives the activation energy for the internal rotation.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 146-151 (1995) [Vol. 68, No. 1, January, 1995]
Hisao Tsutsumi, and
Kaoru Tsujii
1,3 : 2,4-Di-O -benzylidene- D -sorbitol ( D -DBS) can cause gelation of the organic solvents into gel state. The D -DBS formed a fibrous super-helical structure in the gel state. The aggregated structure of D -DBS molecules in the gel state have been studied, utilizing the IR, UV, and CD spectral measurements.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 152-159 (1995) [Vol. 68, No. 1, January, 1995]
The self diffusion coefficient in Lennard-Jones fluid was studied by molecular dynamics simulation. Simulations were done at 414 states in the temperature-volume plane. An equation of state for the self diffusion coefficient was derived by the least square fitting. The calculated equation of state was in agreement with the experimental results on CO 2 .
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 160-164 (1995) [Vol. 68, No. 1, January, 1995]
Hiroko Shimada,*
and
Ryoichi Shimada
The relative value of the principal elements of the Raman polarizability of the totally symmetric vibrations of naphthalene and maleic anhydride was estimated fairly well by analyzing the polarized Raman spectrum in single crystal and the interesting relation between the Raman polarizability and vibrational mode was discussed.
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=============================
Articles
Analitical and Inorganic
=============================
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 165-171 (1995) [Vol. 68, No. 1, January, 1995]
A novel homogeneous electrochemical immunoassay using ferrocene-(Fec-), digoxin- (Dig-) double conjugated protein, has been developed. The system is based on the principle of that electrochemical activity of the conjugate is suppressed in the presence of an antibody, and restored in the presence of free digoxin.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 172-177 (1995) [Vol. 68, No. 1, January, 1995]
-Diketon Mixed-Ligand Systems
From poly(pyrazol-1-yl)borate-
-diketone mixed-ligand systems, trivalent lanthanoid ions are extracted into benzene as [M{Hn
B(pz)4-n
}2
(
-diketone)]. The stability and extractability of [M{Hn
B(pz)4-n
}2
(
-diketone)] complexes are governed by intra- and interligand contact. The intraligand contact between the pyrazol-1-yl groups in the poly(pyrazol-1-yl)borates prevents [B(pa)4
]-
from opening the bite size.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 178-182 (1995) [Vol. 68, No. 1, January, 1995]
-Amido-
-hyperoxo-dicobalt(III) Complexes with Ammine and Polyamine Ligands in Aqueous Solutions:
Effects of Ligand and pH
Photolyses of
-hyperoxo dicobalt(III) complexes with polyamine ligands in a neutral aqueous solution produce a
-peroxo dicobalt complex as one of the decomposition products which, however, differ with the kinds of the coordinated ligands as shown below.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 183-190 (1995) [Vol. 68, No. 1, January, 1995]
,
'
-diyl Group as an
2
(
C
,
N
) :
3
(
C
,
C'
,
N
)-Bridging Ligand
Oxidative addition of 2-(chloromethyl)pyridine to [RhCl(PPh3
)3
] generates mononuclear Rh(III) complexes, cis
(PP
)- and trans
(PP
)-[RhCl2
(C5
H3
N-2-CH2
)(PPh3
)2
]. With 2,6-bis(chloromethyl)pyridine, however, a novel dinuclear Rh(III) complex having an 3
-pseudo-1-azaallylic functionality as shown below is formed in addition to mononuclear complexes analogous to those mentioned above.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 191-196 (1995) [Vol. 68, No. 1, January, 1995]
Radiochemical measurements were carried out to determine Na+ -diffusion coefficient and its activation energy in two hydrous titanium (IV) oxides, precipitated at pH 6 (Ti6) and pH 13 (Ti13). The rates differ markedly between the two exchangers, reflecting large differences in equilibrium properties between them.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 197-203 (1995) [Vol. 68, No. 1, January, 1995]
Dissociation rates of the imidazole ligands in tetraarylporphyrinatocobalt(III) complexes were determined by the saturation transfer method. The rates in the TMP complexes were smaller than those of the corresponding TPP complexes. The results were explained in terms of the deformation of the porphyrin ring together with the attractive interactions between o
-methyls and imidazole 
systems.
=============================
Articles
Orgainc and Biological
=============================
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 204-210 (1995) [Vol. 68, No. 1, January, 1995]
The ethyl groups on the naphthalene nucleus were found to be converted to carboxyl groups mainly via acetyl groups in the Co(OAc)2 -Mn(OAc)2 -NaBr-catalyzed oxidation of 2,6-diethylnaphthalene by molecular oxygen, giving a nearly 90% yield of 2,6-naphthalenedicarboxylic acid at 160 °C after 1 h. The oxidation was retarded by the naphthalene nucleus.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 211-218 (1995) [Vol. 68, No. 1, January, 1995]
Reaction of trans -decalin-9-sulfenic acid with the methyl arenesulfenates is demonstrated to be a good model to elucidate the mechanism of the self-condensation reaction of sulfenic acids. From the kinetic investigation comparing the hydrolysis of methyl arenesulfenates, it was suggested that the S-S bond formation is expected to be more advanced relative to the S-O bond cleavage in the transition state.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 219-226 (1995) [Vol. 68, No. 1, January, 1995]
and
Mitsuo Hayashi
Physalin K and its new stereoisomer, named physalin Q, were isolated from Physalis alkekengi
var. francheti
. The reported structure of physalin K at the AB ring moiety was revised to 2
,5
-epidioxy-6
-hydroxy-3-en-1-one based on spectroscopic studies and chemical correlations.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 227-229 (1995) [Vol. 68, No. 1, January, 1995]
Cyclization reaction of S-substituted thioglycerol and oligoethylene glycol ditosylate gave thiolariat ethers in moderate yields. Mercaptomethyl crown ethers were obtained easily from benzylthiomethyl crown ethers by Na in liq. NH3 -BuOH.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 230-236 (1995) [Vol. 68, No. 1, January, 1995]
The reflection spectrum of glucose oxidase stanined by coomassie brilliant blue could be successfully observed by reflection spectroscopy.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 237-242 (1995) [Vol. 68, No. 1, January, 1995]
A simple one-pot reaction system, which yields 2-C hydroxymethylated aldopentose was investigated. 2-C hydroxymethylated D -ribose (Hamamelose), L -lyxose were prepared from corresponding ketoses, D -fructose, L -sorbose, respectively. The isomerization of ketose to the branched sugar proceeded in the ternary nickel complex through the stereospecific rearrangement of carbon sequences in the sugar.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 243-249 (1995) [Vol. 68, No. 1, January, 1995]
A series of triarylmethanols bearing o -methoxyl groups ( 1a : [2,6-(MeO)2 C6 H3 ]3 COH, 1b : (2-MeOC6 H4 )[2,6-(MeO)2 C6 H3 ]2 COH, 1c : Ph[2,6-(MeO)2 C6 H3 ]2 COH, 1d : [2,5-(MeO)2 C6 H3 ]3 COH, 1e : Ph2 [2,6-(MeO)2 C6 H3 ]COH) were prepared. The triarylmethanols 1a - e and the corresponding carbenium salts, [Ar3 C]X 2a - c , were reduced in acidic primary alcohols to triarylmethane Ar3 CH. The reaction rates in several alcohols increased in the order 2a<2b<2c , and the reaction rates of alcohol for 2c decreased in the order ethanol>3-methyl-1-butanol>1-butanol>2-propanol>methanol>2-butanol>2 -methyl-1-propanol. Compounds 2b , c were also reduced in tetrahydrofuran, and formed xanthene derivatives in dimethyl sulfoxide or in water.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 250-261 (1995) [Vol. 68, No. 1, January, 1995]
Treatment of 1-(1-iodoalkyl)silacyclobutanes with t -BuOK provided 2-alkylsilacyclopentanes which were easily converted into 1,4-diols. An addition of i -PrOLi to 1-[(Z )-1,2-epoxyhexyl]-1-methylsilacyclobutane gave erythro -2-(hydroxypentyl)-1-isopropoxy-1-methylsilacyclopentane, which was converted into (Z )-4-nonen-1-ol, (E )-4-nonen-1-ol, or 1,4,5-nonanetriol.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 262-276 (1995) [Vol. 68, No. 1, January, 1995]
Yoshinori Tanaka,
Seiji Taniguchi,
Tadashi Okada,
Iwao Yamazaki,
and
Yoshinobu Nishimura
Synthesis and excited-state dynamics are described for fixed-distance porphyrin-oxochlorin-pyromellitdimide triads (P-C-Im). In DMF, a long-lived charge separated state (ZnP)+ -H2 C-(Im)- is generated from ZnP-1 (H2 C)* -Im via two-step electron transfer of initial charge separation between the 1 (H2 C)* and ZnP followed by a charge shift reaction from the (H2 C)- to the Im.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 277-281 (1995) [Vol. 68, No. 1, January, 1995]
and
Katsumi Tokumaru*
Pulsed laser excitation of contact charge transfer pairs of hexamethylbenzene and oxygen in methanol-acetonitrile gave no evidence for intermediacy of reactive species such as HMB radical cations and pentamethylbenzyl cations, though stationary irradiation of the pair in hydroxylic solvents afforded distinct products arising from the cationic species.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 282-284 (1995) [Vol. 68, No. 1, January, 1995]
Zinc dust in acetic acid has been found to be a versatile and chemoselective reagent for reduction of various arylcarbonyls to corresponding alcohols or alcoholic acetates in fair yields.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 285-288 (1995) [Vol. 68, No. 1, January, 1995]
Stereoselectivity of microbial reduction of ethyl 2-methyl-3-oxobutanoate can be controlled by the addition of methyl vinyl ketone to the reaction system. The reduction by mold with an additive affords the corresponding anti -(2S ,3S )-hydroxy ester selectively, whereas the reduction by yeast with an additive gives the corresponding syn -(2R ,3S )-hydroxy ester selectively.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 289-296 (1995) [Vol. 68, No. 1, January, 1995]
-Ethylidenecycloalkanones to
-Alkylidenecycloalkanones Induced by Trimethylstannyllithium/Aldehyde Equivalents/Lewis Acids
Ethylidenecycloalkanones underwent a ring enlargement upon treatment with trimethylstannyllithium/aldehyde equivalents/Lewis acids with high stereoselectivity.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 297-300 (1995) [Vol. 68, No. 1, January, 1995]
and
Naoka Utsumi
Several 2-alkynyl and 2-alkenyl alcohols were effectively sulfonated with methanesulfonyl chloride or p -toluenesulfonyl chloride using the combined bases of catalytic amount of tertiary amine and potassium carbonate. The reaction was conducted with reliable safety and with avoiding the disposal of wasted amines on a large scale.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 301-304 (1995) [Vol. 68, No. 1, January, 1995]
Thermolyses of isomeric mixtures of dicyclopentadienylmethyl alcohols at 300 °C by a flow method give the corresponding isomeric mixtures of cyclopentadienylmethyl alcohols which in turn furnish fulvene derivatives upon treatment with bases.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 305-308 (1995) [Vol. 68, No. 1, January, 1995]
Methyl 5-methoxy-2-methyl-7-pentyl-2H -chromen-2-acetate ( 2 ), prepared from 2-hydroxy-6-methoxy-4-pentylbenzaldehyde and dimethyl isopropylidenemalonate, was converted to natural dl -cannabichromene ( 1 ).
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 309-314 (1995) [Vol. 68, No. 1, January, 1995]
A synthesis of new carbonate``alkoxymethyl carbonate ( 1 )" is presented starting with alcohol. In the presence of potassium carbonate, primary alcohols react with chloromethyl alkyl ethers in N ,N -dimethylformamide under mild conditions to give the corresponding alkoxymethyl carbonates in good yields.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 315-321 (1995) [Vol. 68, No. 1, January, 1995]
-Hydroxy Carboxylic Acid Containing Octaether Linkages as a Synthetic Analog of Natural Carboxylic Acid Ionophores through an Organic Liquid Membrane
Hitoshi Kuboniwa,
Satoru Nagami,
Toru Bando,
Akira Hirao,
Seiichi Nakahama, and
Noboru Yamazaki
Compound
1
was employed for a carrier to transport alkali metal ions through organic liquid membrane. The selectivity sequence was K+
Rb+
>Cs+
>Na+
Li+
. The high preference of K+
to Na+
was explained by the difference of transport mode: K+
transported as a salt molecule, while Na+
transported as an emulsion-like aggregate of the salt.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 322-329 (1995) [Vol. 68, No. 1, January, 1995]
-Radicals of Carbonyl Compounds from the
-Stannyl Derivatives and Their Reactions with Electron-Rich Olefins
The oxidation of
-tributylstannyl alkanoates with tetrabutylammonium hexanitratocerate(IV) (TBACN) generates
-radicals of the alkanoates by eliminating the stannylium ion. The thus-formed radicals react with various electron-rich olefinic compounds, such as silyl enol ethers, giving addition products in good yield.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 330-336 (1995) [Vol. 68, No. 1, January, 1995]
and
Saburo Aimoto*
A method for the preparation of cysteine-containing peptide thioester was developed, based on a Npys mode solid-phased method. Using the thioester as a building block, the barnase-like domain in DNA-directed RNA polymerase II, consisting of 112 amino acid residues, was synthesized.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 337-340 (1995) [Vol. 68, No. 1, January, 1995]
-[Phenyl(or Methyl)seleno]alkyl Aryl Ketones with Metal Hydrides
Metal hydride reduction of a variety of
-[phenyl(or methyl)seleno]alkyl aryl ketones gives a threo
-major mixture of threo
- and erythro
-
-aryl-
-hydroxyalkyl phenyl selenides by carbonyl reduction and 1-aryl-1-alkanol by the substitution of a phenyl(or methyl)seleno group with hydrogen.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 341-349 (1995) [Vol. 68, No. 1, January, 1995]
The rearrangement mode on thermolysis of 1 depends on the halogen atom and the reaction media. Polar solvents guide the pass of 1 (X=Cl ) to 3 , while basic additives to 2 . 1 (X=F ) decay preferentially to 3 .
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 350-363 (1995) [Vol. 68, No. 1, January, 1995]
,
-Diketo Esters.
A Novel Strategy for the Synthesis of Artificial HMG-CoA Reductase Inhibitors
Stepwise reduction of
,
-diketo esters of an enantiomeric form of the Taber's alcohol first with i
-Bu2
AlH and then with NaBH4
-Et2
BOMe proceeded selectively to give syn
-
,
-dihydroxy esters of high enantiomeric excess. The resulting diols were hydrolyzed and lactonized to give various types of
-hydroxy-
-lactones commonly found in artificial HMG-CoA reductase inhibitors.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 364-372 (1995) [Vol. 68, No. 1, January, 1995]
Asymmetric reduction of
,
-diketo esters derived from
D
-tartrate afforded (-)-6-oxo-3,5-isopropylidenedioxyhexanoate esters, which was converted into highly potent HMG-CoA reductase inhibitors.
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 373-377 (1995) [Vol. 68, No. 1, January, 1995]
The Beckmann rearrangement of oximes is catalyzed with tetrabutylammonium perrhenate (Bu4 NReO4 ), trifluoromethanesulfonic acid and hydroxylamine hydrochloride in nitromethane under azeotropic conditions, giving amides in high yield. By the use of the above-mentioned catalytic system, amides are prepared directly from ketones and hydroxylamine hydrochloride.
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=============================
Articles
Applied and Materials
=============================
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 378-384 (1995) [Vol. 68, No. 1, January, 1995]
On the basis of a consecutive reaction mechanism for the electroreduction of benzoic acid to benzaldehyde and benzyl alcohol, the product selectivity is theoretically simulated and agrees with an experimental value. For the simulation, mass transfer rate and equilibrium constant of benzoic acid are taken into account.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 385-387 (1995) [Vol. 68, No. 1, January, 1995]
The dehydrogenation reaction of cyclohexanol to cyclohexanone, shown in the scheme below, was effectively catalyzed by activated carbon-supported Co. Highly dispersed and well-reduced cobalt catalyst showed pronounced activity and stability.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 388-392 (1995) [Vol. 68, No. 1, January, 1995]
Kohji Yoshinaga,
Youichi Ishihara,
Michio Komatsu,
and
Hiroyasu Nishida
Silica surface is modified with a polyol-based coupling polymer ( CP ). The redispersibility markedly depends on charged CP /silica ratio. Other factors examined are the Mw of CP and the size of the modified silica particles. Free polymers are not required for the redispersibility.
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1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 393-397 (1995) [Vol. 68, No. 1, January, 1995]
Sulfur-containing aromatic disubstituted acetylenes (
1a
,
2a
, and
3
) polymerize with Mo and/or W catalysts. Poly(
1a
) and poly(
2a
) are yellow solids soluble in toluene and chloroform (
Copyright (C)
1995 The Chemical Society of Japan
Bull. Chem. Soc. Jpn.,
68, 398-402 (1995) [Vol. 68, No. 1, January, 1995]
1-(1-Naphthyl)-1-propyne polymerized with NbCl5 -based catalysts in high yields. The polymer was a pale yellow solid soluble in toluene and CHCl3 , and formed a free-standing film on solution casting. The onset temperature of weight loss of the polymer in air was ca. 340 °C. The oxygen permeability coefficient at 25 °C was 80 barrers.
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