Convenient synthesis of t-butyl Z-3-substituted glycidates under conditions of phase-transfer catalysis
摘要:
Reactions of mixtures of t-butyl E- and Z-3-substituted glycidates 1a-h with 50% aq. sodium hydroxide and a catalyst, benzyltriethylammonium chloride, TEBAC in dichloromethane (phase-transfer catalysis, PTC led to preferential hydrolysis of the E-isomers to afford pure (90-98%) t-butyl Z-3-substituted glycidates 1a-i in good yields; PTC cleavage of glycidates additionally substituted at C-2, 1g or C-3, 1h,i suggests that an aryl group in the Z isomers hampers attack of HO- on the carbonyl carbon atom. As described in the literature, the diastereoselective PTC synthesis of Z-3-substituted glycidates and glycidonitriles consists of fast hydrolysis of E isomers present in mixtures with Z ones. (C) 2003 Elsevier Science Ltd. All rights reserved.
Method for producing polydienes and polydiene copolymers with reduced cold flow
申请人:BRIDGESTONE CORPORATION
公开号:US10301397B2
公开(公告)日:2019-05-28
A method for preparing a coupled polymer, the method comprising the steps of (i) polymerizing monomers to form a reactive polymer, and (ii) reacting the reactive polymer with a glycidic ester.
AVI A. I.; REMLI M.; CONDOM R.; GUEDJ R., J. FLUOR. CHEM., 1981, 17, NO 6, 565-580
作者:AVI A. I.、 REMLI M.、 CONDOM R.、 GUEDJ R.
DOI:——
日期:——
METHOD FOR PRODUCING POLYDIENES AND POLYDIENE COPOLYMERS WITH REDUCED COLD FLOW
申请人:Bridgestone Corporation
公开号:EP2780177A1
公开(公告)日:2014-09-24
Method For Producing Polydienes And Polydiene Copolymers With Reduced Cold Flow
申请人:LUO Steven
公开号:US20140296445A1
公开(公告)日:2014-10-02
A method for preparing a coupled polymer, the method comprising the steps of: (i) polymerizing monomers to form a reactive polymer, and (ii) reacting the reactive polymer with a glycidic ester.