SALICYLIC ACID DERIVATIVE AND ITS USE AS INTERMEDIATE FOR THE PREPARATION OF SALICYLALDEHYDE DERIVATIVE

摘要

Salicylic acid derivative of the formula II'(see formula I) where A is an unsubstituted or substituted phenyl radical, an unsubstituted 5-member heteroaromatic radical having from 2 to 4 nitrogen atoms or one or two nitrogen atoms and additionally one sulfur or oxygen atom or an unsubstituted or substituted thienyl, pyridyl, naphthyl, quinolyl, indaxolyl or benzotriazolyl radical, and the radicals R4 and R5 have the meanings given in the specification, and its use as intermediate for the preparation of salicyladehyde derivatives.