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Atsuyoshi Ohno Yuji Ishihara Satoshi Ushida Shinzaburo Oka 《Tetrahedron letters》1982,23(31):3185-3188
Benzaldehyde are reduced to benzyl alcohol by a model compound of NAD(P)H almost quantitatively. Reductions of some other aldehydes are also mentioned. 相似文献
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Racemic and optically active title compound was reduced with chiral and achiral NAD(P)H models. The composition of diastereomers in the product was determined and the steric relationship is discussed. 相似文献
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The "flexible" 3 and "rigid" cyclic viologens 4, diquarternary salts of 2,2'-bipyridine and 1,10-phenanthroline, respectively, were treated with tributylphosphine (1) in acetonitrile containing a large amount of methanol under an argon atmosphere. A single electron transfer (SET) easily occurred from the latter to the former, the SET to 4 being 10(5)-10(6) times faster than the SET to 3. The reorganization energy lambda for the latter SET is thought to be larger than that for the former SET, because 3 undergoes a structural change upon the one-electron reduction to its radical cation, whereas the one-electron reduction of 4 takes place without a structural change. Taking into account the difference in lambda, and also taking into account the bond formation energy brought about by the follow-up reaction of the phosphine radical cation 1*(+) with methanol, the observed kinetics were well interpreted in terms of the Marcus theory. 相似文献
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Atsuyoshi Nakayama Minoru UkitaJun Iyoda Norioki KawasakiNoboru Yamamoto 《Polymer Degradation and Stability》2012,97(1):14-20
Copolyesters of poly(ε-caprolactone) diol and 1,18-octadecane dicarboxylic acid were synthesized by polyaddition. The copolymers have a "mixed" structure of ’polyester-polyethylene’. Characterization was carried out by using 1H and 13C NMR, FT-IR, viscosities, DSC, and GPC. The tensile strength varied from 11.9 to 19.9 MPa, and elongation at break varied from 370 to 660 %, respectively. Biodegradability was evaluated by enzymatic hydrolysis (lipases from Rhizopus arrhizus and Candida cylindracea and an esterase form hog liver) and by soil burial test. Both tests showed that the copolyesters were characterized by enhanced biodegradability. 相似文献
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Kaoru Nakamura Masato Higaki Kazutoshi Ushio Shinzaburo Oka Atsuyoshi Ohno 《Tetrahedron letters》1985,26(35):4213-4216
Ketones in β-keto esters are reduced asymmetrically by immobilized bakers' yeast. The configuration and the enantiomer excess of the products are dramatically changed by the entrapment of yeast cells in dense polyurethane matrices. 相似文献