US Patent 4,895,991
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
The process of direct synthesis of trifluoromethyl copper and trifluoromethyl aromatics, both intermediate reagents useful in direct synthesis of certain perfluoroalkyl compounds. The process involves a direct reaction between on the one hand an aromatic halide and a difluorodihalomethane and on the other hand copper and a difluorodihalomethane.
Burton, Donald J.; Wiemers, Denise M.; and Easdon, Jerome C. Method of preparation of trifluoromethyl copper and trifluoromethyl aromatics. US Patent 4,895,991 filed January 25, 1989 and issued January 23, 1990. https://ir.uiowa.edu/patents/70