PROCESS FOR THE PREPARATION OF 25,26,27,28-TETRAHYDROXYCALIX4ARENE-5,17-DICARBOXYLIC ACIDS

摘要

A process for the preparation of25,26,27,28-tetrahydroxycalix[4]arene-5,17-dicarboxylic acid of general formula:,wherein X=H, Hal. In addition, 25, 27-di(25,26,27, 28-tetra)alkoxycalix[4]arene-5,17- dicarboxylic acids are dealkylated with Lewis acids in benzene, while heating, for 1-12 hours with further separation of final product by conventional methods.