Process for O-acylating phenol derivatives and acylating compositions for this purpose

摘要

The invention relates to a process for the preparation of carbamic acid phenyl esters of the formula (I) <IMAGE> (I) by acylating phenol derivatives of the formula (II) <IMAGE> (II) wherein R is alkyl having 1 to 8 carbon atoms, aryl, cycloalkyl having 5 or 6 carbon atoms, aralkyl having 7 to 16 carbon atoms which groups can be substituted by one or more alkyl groups, R1 is hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or acylamino, R2 is hydrogen, halogen, alkyl having 1 to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms, or if R1 and R2 represent alkyl and/or alkoxy, they can form together a carbocyclic ring. According to the invention the phenol derivatives of the general formula (II), wherein R1 and R2 are as defined above, are reacted with N-carbamoyl-saccharin derivatives of the formula (IV) <IMAGE> (IV) wherein R has the same meaning as defined above, in the presence of a base.