AROMATIC ACID CHLORIDE PROCESS

摘要

Process for preparing benzene carbonyl chlorides useful as intermediates for making polyester, polyamide and the like condensation polymers by (1) mixing a trichloromethyl benzene bearing at least one additional halogen, trichloromethyl or carbonyl chloride group, all carbon-containing groups being nonadajacent to each other, with at least about two molecules of sulfur trioxide per trichloromethyl group; and (2) maintaining the mixture at a temperature at which it is molten but below which ring sulfonation occurs for a time sufficient to convert at least one trichloromethyl group to a carbonyl chloride group.