申请人:Monsanto Company
公开号:US04521344A1
公开(公告)日:1985-06-04
A phenylethyl substituted dimer of ethylene and maleic anhydride, named 7-phenyloctane-(1,2),(5,6)-dianhydride, is chemically synthesized by (a) alkylating alkyl 2,4-dihalobutyrate with alkyl 2-cyano-3-phenylbutyrate, (b) alkylating the resulting halide condensation product with a carboxylate selected from the group consisting of trialkyl ethane-1,1,2-tricarboxylate and dimethyl cyanoethane-1,2-dicarboxylate, (c) acid hydrolyzing the resulting tetra or pentaester accompanied by decarboxylating, and (d) dehydrating the resulting tetra-acid to yield the desired phenylethyl substituted dimer of ethylene and maleic anhydride, wherein the alkyls in the butyrate and carboxylate ester groups each contain from one to about four carbon atoms and halo is selected from the group consisting of bromo, chloro and iodo.
一种苯乙基取代的乙烯和马来酸酐二聚体,命名为7-苯基辛烷-(1,2),(5,6)-二酸酐,通过以下化学合成:(a)用2-氰基-3-苯基丁酸酯烷基化2,4-二卤丁酸酯,(b)用三烷基乙烷-1,1,2-三羧酸酯或二甲基氰乙烷-1,2-二羧酸酯中选择的羧酸酯烷基化所得的卤代缩合产物,(c)酸水解所得的四酯或五酯并伴随脱羧作用,(d)脱水所得的四酸,以得到所需的苯乙基取代的乙烯和马来酸酐二聚体,其中丁酸酯和羧酸酯中的烷基均含有1至约4个碳原子,卤素选择自溴、氯和碘。