[EN] CATALYSED ALTERNATING COPOLYMERISATION AND PRODUCT
申请人:——
公开号:WO1981001289A1
公开(公告)日:1981-05-14
(EN) A Process for the preparation of a copolymer comprising sequences of alternating monomer residues, which process comprises reacting at least one donor monomer with at least one acceptor monomer in the presence of: 1) a transition metal complex comprising at least one (Alpha)-acid ligand; 2) an organic compound, which may be a polymer, comprising at least one carbon-halogen bond, an acetylenic bond or an ethylenic bond conjugated with one or more electron attracting (-R) groups; and 3) a Lewis acid. (FR) Procede de preparation d'un copolymere comprenant des sequences de restes monomeres alternes, ce procede se basant sur la reaction entre au moins un monomere donneur et un monomere accepteur en presence de: (i) un complexe de metal de transition comprenant au moins un groupe de coordination (Alpha)-acide; (ii) un compose organique, qui peut etre un polymere, comprenant au moins une liaison carbone-halogene, une liaison acetylenique ou une liaison ethylenique conjuguee avec un ou plusieurs groupes d'attraction d'electrons (-R); et (iii) un acide de Lewis.
Microbial deracemization of α-substituted carboxylic acids: control of the reaction path
作者:Dai-ichiro Kato、Kenji Miyamoto、Hiromichi Ohta
DOI:10.1016/j.tetasy.2004.06.049
日期:2004.9
A novel approach to preparing optically active alpha-substituted carboxylic acids using the whole cells of Nocardia diaphanozonaria JCM 3208 is described. When 2-phenylthiopropanoic acid and 2-methyl-3-phenylpropanoic acid were subjected to the reaction under aerobic conditions, the oxidation reaction proceeded preferentially rather than deracemization of these substrates. Herein, we report the design of reaction conditions to increase the deracemization activity in preference to oxidation reactions. In addition, we have successfully detected a metabolic intermediate in the reaction mixture of 2-methyl-3-plienylpropanoic acid, which indicates that the deracemization is a competitive reaction against the beta-oxidation pathway of fatty acid metabolism. (C) 2004 Elsevier Ltd. All rights reserved.
Kasahara, Akira; Izumi, Taeko; Ogihara, Takao, Journal of Heterocyclic Chemistry, 1989, vol. 26, p. 597 - 599
作者:Kasahara, Akira、Izumi, Taeko、Ogihara, Takao
DOI:——
日期:——
Dandarova, Miloslava; Kovac, Jaroslav; Vegh, Daniel, Collection of Czechoslovak Chemical Communications, 1982, vol. 47, # 12, p. 3412 - 3417
作者:Dandarova, Miloslava、Kovac, Jaroslav、Vegh, Daniel、Zvak, Vladimir
DOI:——
日期:——
KASAHARA, AKIRA;IZUMI, TAEKO;OGIHARA, TAKAO, J. HETEROCYCL. CHEM., 26,(1989) N, C. 597-599