Kinetic resolution of racemic epsilon-lactones by Pig Liver Esterase give optically active R (+) epsilon-lactones. When alkyl group is higher than propyl, Horse Liver Esterase leads to the destruction of the opposite enantiomer. Enantiomeric excess is easily evaluated by G.C. on a chiral stationary phase.
Kinetic resolution of racemic epsilon-lactones by Pig Liver Esterase give optically active R (+) epsilon-lactones. When alkyl group is higher than propyl, Horse Liver Esterase leads to the destruction of the opposite enantiomer. Enantiomeric excess is easily evaluated by G.C. on a chiral stationary phase.
Two-step or three-step one-carbon ringenlargement of lactones is realized from lactones and chloromethyl phenyl sulfoxide via a rearrangement of alkylidene carbenoid followed by intramolecular cyclization of the ω-hydroxyalkyl ketene intermediate or via a 2-pyridinethiol ester.
Abbasov; Alimardanov; Suleimanova, Russian Journal of Applied Chemistry, 1997, vol. 70, # 4, p. 621 - 626
作者:Abbasov、Alimardanov、Suleimanova
DOI:——
日期:——
COMPOSITION AND POLYMER
申请人:Asahi Kasei Kabushiki Kaisha
公开号:EP2735581B1
公开(公告)日:2021-07-14
Composition and Polymer
申请人:Nakamura Akitake
公开号:US20140121293A1
公开(公告)日:2014-05-01
Disclosed is a composition comprising (A) at least one compound selected from the group consisting of an ether compound having two or more ether groups, a trivalent phosphorus compound, and a ketone compound, (B) a boron trihalide, and (C) an episulfide compound.