Über 1-Hydroxyalkan-1,1- diphosphonsäuren

The reaction of acylating agents with H₃PO₃ or carbonic acids with PCl₃ and calculated amounts of water gives raw products converted by steam treatment into high yields of 1-hydroxyalkane-1,1-diphosphonic acids. A cyclic condensation product of two molecules 1-hydroxyethane-1,1-diphosphonic acid was found in the raw product of the reaction of acetylating agents with H₃PO₃. Two structure proposals are discussed.