申请人:AMERICAN CYANAMID COMPANY
公开号:EP0101877A1
公开(公告)日:1984-03-07
Processes for the preparation of N-allyl-O-alkyl thionocarbamates are disclosed. The first comprises reacting an an aqueous solvent and in the presence of a phase transfer catalyst a cyanide salt, sulfur and an allyl halide to form an allyl isothiocyanate and then reacting said allyl isothiocyanate in the presence of certain catalysts with an alcohol.
The second comprises an improvement in the process for the preparation of N-allyl-O-alkyl thionocarbamates by the reaction of an allyl isothiocyanate with an alcohol. The improvement comprises the use of a catalyst of the general formula:
wherein R1, R2, R3, R4, and Rs are individually selected from alkyl or aryl or a mixture thereof, M represents a metal from Group III B, IV B, or V B of the Periodic Table of the Elements, and n is the integer 0 or 1; provided that the sum of n1, n2, n3, n4, and ns equals the valance of said metal M.
本发明公开了制备 N-烯丙基-O-烷基硫代氨基甲酸酯的工艺。第一种工艺包括在相转移催化剂存在下,使氰化盐、硫和烯丙基卤化物与水性溶剂反应生成异硫氰酸烯丙酯,然后在某些催化剂存在下使所述异硫氰酸烯丙酯与醇反应。
第二种包括通过异硫氰酸烯丙酯与醇反应制备 N-烯丙基-O-烷基硫代氨基甲酸盐工艺的改进。该改进包括使用通式的催化剂:
其中 R1、R2、R3、R4 和 Rs 分别选自烷基或芳基或它们的混合物,M 代表元素周期表中第 III B、IV B 或 V B 族的金属,n 是 0 或 1 的整数;条件是 n1、n2、n3、n4 和 ns 的总和等于所述金属 M 的价。