US Patent 4,393,011
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
Fluorine-containing phosphonates and phosphonic acids are described. The method of preparation is a reaction of trialkylphosphites with dihalodifluoromethanes or a reaction of the salts of dialkylphosphites with halodifluoromethylphosphonates. The corresponding phosphonic acids are prepared by hydrolysis of the phosphonates.
Burton, Donald J. and Flynn, Richard M. Method for the preparation of fluorine-containing phosphonates and phosphonic acids. US Patent 4,393,011 filed March 08, 1982 and issued July 12, 1983. https://ir.uiowa.edu/patents/32