Bulletin of the Chemical Society of Japan Vol. 83 No. 2

Chiral Phosphoric Acids as Versatile Catalysts for Enantioselective Carbon–Carbon Bond Forming Reactions

Masahiro Terada — Fri, 29 Jan 2010

Binaphthol-derived monophosphoric acids were designed as novel chiral Brønsted acid catalysts. The chiral phosphoric acids thus developed functioned as efficient enantioselective catalysts for a variety of carbon–carbon bond forming reactions affording enantioenriched products in excellent selectivities.

Easy Separation of Optically Active Secondary Alcohols by Enzymatic Hydrolysis of Soluble Polymer-Supported Carbonates

Fri, 29 Jan 2010

The enzyme-mediated enantioselective hydrolysis of middle molecular weight poly(ethylene glycol) (PEG)-supported carbonates is disclosed. In this system, the separation of the remaining (S)-substrate and the resulting (R)-alcohol was achieved by a simple procedure without any laborious column chromatography.

Adsorption of Simazine on a Glassy Carbon Electrode

Sara Pintado and José Miguel Rodríguez Mellado — Fri, 29 Jan 2010

Measurements of differential capacity vs. potential have been made for the herbicide simazine (2-chloro-4,6-bis(ethylamino)-1,3,5-triazine). The decrease in capacity was independent of the applied potential, so the adsorption is independent of the potential. The adsorption follows a Langmuir type isotherm.

A Novel 3D Photoluminescent Silver(I) Coordination Polymer Featuring Unusual μ4-Bonded and Usual μ2-Bonded 2-Aminopyrazine

Fri, 29 Jan 2010

The coexistence of unusual μ₄- and usual μ₂-bonded modes of 2-aminopyrazine is observed for the first time in a novel 3D Ag(I) coordination polymer incorporating 1D {[Ag₄(μ₄-NHpyz)₂]²⁺}_n cylinders. Moreover, 1 exhibits photoluminescence properties.

A Comparative Study on Chiral and Racemic 12-Hydroxyoctadecanoic Acids in the Solutions and Aggregation States: Does the Racemic Form Really Form a Gel?

Fri, 29 Jan 2010

Separately formed gels of d- and l-12HOAs became a solution on maintaining contact, showing that dl-12HOA does not form a gel. NMR spectroscopy shows that molecular aggregation is more favorable in the dl-12HOA solutions than in the d-12HOA solutions.

Preparation and Reactivity of Vitamin B12–TiO2 Hybrid Catalyst Immobilized on a Glass Plate

Fri, 29 Jan 2010

The vitamin B₁₂–TiO₂ hybrid catalyst was effectively immobilized on a glass plate, and the immobilized catalyst shows efficient reactivity for various molecular transformations during irradiation by UV light.

Incorporation of Non-Natural Amino Acids with Two Labeling Groups into the N-Terminus of Proteins

Fri, 29 Jan 2010

Non-natural amino acids with both fluorophore and biotin were designed, synthesized, and incorporated into the N-terminus of proteins in response to a UAG initiator codon in a cell-free protein synthesizing system.

Reactions of Molybdenum Tetrahydrido Complex with Halohydrosilanes

Fri, 29 Jan 2010

The thermal reactions of [MoH₄(dppe)₂] (1, dppe = Ph₂PCH₂CH₂PPh₂) with RSiH₂X afford [MoH₂X(dppe){[Ph₂PCH₂CH₂P(Ph)C₆H₄-o]RXSi-P,P,Si}] (R = Ph, X = Cl (5a); R = cyclo-C₆H₁₁, X = Cl (5b); and R = Ph, X = Br (6)) by synchronous activation of the Si–H bond and the ortho C–H bond of the dppe ligand. Reduction of the Si–Cl and Mo–Cl bonds in 5a with LiAlH₄ gives the original complex 1 as a result of Si–C bond cleavage.

Synthesis and Structure of Group 10 Metal Complexes with New Tripodal Tetradentate Ligand Bearing One Phosphine and Three Thioether Moieties

Nobuhiro Takeda, Yusuke Tanaka, Fumiaki Sakakibara and Masafumi Unno — Fri, 29 Jan 2010

A new phosphine ligand tethered with three thioether moieties, [2-(i-PrS)C₆H₄]₃P, forms five-coordinate trigonal-bipyramidal complexes with nickel(II) and palladium(II) and a square-planar complex with platinum(II). These results are consistent with the tendency to form five-coordinate complex in the order of Ni^II > Pd^II > Pt^II.

Partial Pair Correlation Functions of Highly Concentrated Aqueous Urea Solutions Determined by Neutron Diffraction with 14N/15N and H/D Isotopic Substitution Methods

Yasuo Kameda, Asami Maki, Yuko Amo and Takeshi Usuki — Fri, 29 Jan 2010

Neutron diffraction measurements were carried out on ¹⁴N/¹⁵N and H/D isotopically substituted aqueous 25 mol % urea solutions in order to obtain direct experimental information on the short-range structure of the urea–urea, urea–water, and water–water interactions in highly concentrated aqueous urea solutions near saturation.

Viscoelasticity, Leachability, and Antimicrobial Activity of Poly(vinyl chloride) Blended with Benzyldimethyltetradecylammonium Bis(2-ethylhexyl) Sulfonatosuccinate

Hajime Katano and Toshihide Tsukatani — Fri, 29 Jan 2010

Benzyldimethyltetradecylammonium salt with bis(2-ethylhexyl) sulfonatosuccinate (BA14BEHS) is a halogen-free low-volatile liquid material. BA14BEHS showed good compatibility with poly(vinyl chloride). BA14BEHS-blended poly(vinyl chloride) film exhibited low-leachability. Nevertheless, the film exhibited an antimicrobial performance.