A process for the preparation of a substituted-phenyl-N-alkyl-carbamate of the formula ##STR1## wherein R.sup.1 and R.sup.2 form part of a carbamoyloxy group and are identical or different and each is hydrogen or lower alkyl, R is halogen, formyl group or a group of the formula ##STR2## in ortho or meta-position to the carbamoyloxy group, wherein X.sup.1 and X.sup.2 are identical or different and each is oxygen or sulphur and R.sup.3 and R.sup.4 are identical or different and each is alkyl, alkenyl or alkynyl or together form a 5-membered saturated or unsaturated heterocycle in which X.sup.1 and X.sup.2 are heteroatoms, said process comprising reacting a compound of the formula ##STR3## in the presence of a base with a compound of the formula ##STR4## wherein A is phenyl substituted with two or more electron withdragroups.
制备式为##STR1##的取代苯基-N-烷基-
氨基甲酸酯的方法,其中R.sup.1和R.sup.2形成一个
氨基甲酸酯氧基团的一部分,且相同或不同,且每个是氢或低碳基,R是卤素,甲酰基或式为##STR2##的基团,位于与
氨基甲酸酯氧基团的邻位或间位,其中X.sup.1和X.sup.2相同或不同,且每个是氧或
硫,R.sup.3和R.sup.4相同或不同,且每个是烷基,烯基或炔基,或者一起形成一个5-成员饱和或不饱和杂环,在其中X.sup.1和X.sup.2是杂原子,所述方法包括将式为##STR3##的化合物与式为##STR4##的化合物在碱存在下反应,其中A是苯基,取代有两个或更多电子吸引基团。