Difunctional polyfluoroaromatic derivatives and a process of preparing the same

摘要

The difunctional polyfluoroaromatic compounds represented by the formula <IMAGE> wherein X and Y are identical and are selected from the class consisting of -COOR1, -CH2NH2, -CH2NCO and <IMAGE> wherein R1 is -H, alkyl and R2 and R3 independently are either -H, X or alkyl and n is either 0 or 1 are disclosed. These compounds are derived from those wherein X and Y are -CN which are produced in a solvent specific reaction. The process comprises reacting pentafluorobenzonitrile with a Grignard reagent of the formula CH3MgHal, wherein Hal is -Cl or -Br, in the presence of either tetrahydrofuran, 1,3-dioxolane, dimethoxyethane or diglyme. When the solvent employed is tetrahydrofuran, the cyano compound wherein n is 1 is obtained. When the solvent is 1,3-dioxolane, the cyano compound wherein n is 0 is obtained.