Preparation of haloalylphosphonic acid

Details Preparation of haloalylphosphonic acid Preparation of haloalylphosphonic acid

C - Chemistry, Metallurgy

07

F

260/501.4

C07F 9/38 (2006.01) C07F 9/40 (2006.01)

Patent

CA 1085870

PREPARATION OF HALOALKYLPHOSPHONIC ACID Abstract of the Disclosure A process for the preparation of haloalkylphosphonic acid which comprises contacting hydrogen halide with a haloalkylphosphonate of the formula: Image wherein X is halogen such as fluorine, chlorine, bromine or iodine; R is hydrogen or -(CH2)nX and n is an integer of 1 to 6, in the presence of from about 0.1 to 1.8 moles of water per mole of said phosphonate, which concentration of water is maintained throughout the reaction and which process includes incremental addition, at a temperature of between about 110° and 160°C. of sufficient dry hydrogen halide into a pressure-tight reactor containing the reaction mixture to maintain a pressure of at least 100 psig therein during at least a major portion of the reaction. Completion of the reaction results in a liquid mixture comprising primarily the corresponding alkyl dialide and the haloalkylphosphonic acid.

287599

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