1, 4-bis-(trichloromethyl) benzene purification - - by crystallization from 7-10c hydrocarbons

摘要

by chlorination of p-xylene and crystallisation of the product from a petroleum hydrocarbon fraction (C7-C10) at 75-150 degrees C. 2 or 3 crystallisation may be necessary and, with receyling, an 80-85% yield is obtained. Purification is more efficient than that by crystallisation from glacial acetic acid, and the product is suitable for use in human and veterinary medicine as an anthelmintic and also as an intermediate for preparing terephthaloyl dichloride.