Poly(3,4‐dimethyl‐5‐vinylthiazolium) was synthesized from 3,4‐dimethyl‐5‐vinylthiazole through free radical polymerization and was examined as polymer precatalysts in the presence of 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) for the thioesterification of aldehydes with thiols. The poly(5‐vinylthiazolium)/DBU had excellent catalytic activity and could be reused 10 times without a considerable loss of
METHOD FOR PREPARING S-(-)-BENZOYLMERCAPTO-2-METHYLPROPANOIC ACID COMPOUND
申请人:Zhejiang Huahai Pharmaceutical Co., Ltd.
公开号:EP3912970A1
公开(公告)日:2021-11-24
Disclosed is a method for synthesizing a S-(-)-benzoylmercapto-2-methylpropanoic acid compound, comprising hydrolyzing S-(-)-3-acetylmercapto-2-methylpropanoic acid represented by formula (II) as a raw material in a reaction solvent to obtain S-(-)-3-mercapto-2-methylpropanoic acid represented by formula (III), followed by condensing with benzoyl chloride to obtain S-(-)-benzoylmercapto-2-methylpropanoic acid represented by formula (I). The method of the present application is simple to implement, and the raw and auxiliary materials are cheap and readily available. The reaction conditions are mild, the yield is high, and the quality is high.
本发明公开了一种合成 S-(-)-苯甲酰基巯基-2-甲基丙酸化合物的方法,包括在反应溶剂中水解以式 (II) 代表的 S-(-)-3-乙酰基巯基-2-甲基丙酸为原料,得到以式 (III) 代表的 S-(-)-3-巯基-2-甲基丙酸、然后与苯甲酰氯缩合,得到式(I)代表的 S-(-)-苯甲酰巯基-2-甲基丙酸。本申请的方法简单易行,原辅材料便宜易得。反应条件温和,产率高,质量好。
Procatalysts, catalyst systems, and use in olefin polymerization
申请人:——
公开号:US20010025005A1
公开(公告)日:2001-09-27
There are described solid procatalysts, catalyst systems incorporating the solid procatalysts, and the use of the catalyst systems in olefin polymerization and interpolymerization.
本文介绍了固体原催化剂、含有固体原催化剂的催化剂体系以及催化剂体系在烯烃聚合和互聚中的应用。
Procatalysts, catalyst systems, and use in OLEFIN polymerization
申请人:——
公开号:US20010029286A1
公开(公告)日:2001-10-11
There are described solid procatalysts, catalyst systems incorporating the solid procatalysts, and the use of the catalyst systems in olefin polymerization and interpolymerization.
本文介绍了固体原催化剂、含有固体原催化剂的催化剂体系以及催化剂体系在烯烃聚合和互聚中的应用。
[EN] METHOD FOR PREPARING S-(-)-BENZOYLMERCAPTO-2-METHYLPROPANOIC ACID COMPOUND<br/>[FR] PROCÉDÉ DE PRÉPARATION DE COMPOSÉ D'ACIDE S-(-)-BENZOYLMERCAPTO-2-MÉTHYLPROPANOÏQUE<br/>[ZH] 一种制备S-(-)-苯甲酰巯基-2-甲基丙酸化合物的方法