US Patent 4,478,761
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 preparing fluorine-containing phosphonates. US Patent 4,478,761 filed April 22, 1983 and issued October 23, 1984. https://ir.uiowa.edu/patents/35