Production of 1-hydroxyalkylidene-1, 1-diphosphonic acid esters

Details Production of 1-hydroxyalkylidene-1, 1-diphosphonic acid esters Production of 1-hydroxyalkylidene-1, 1-diphosphonic acid esters

1980-09-22

1982-06-01

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

560266, 2605024A, C07F 938

Patent

active

043327362

ABSTRACT:
Acylated 1-hydroxyalkylidene-1, 1-diphosphonic acid (HADPA) can be produced almost instantaneously with less than 5% (by weight) phosphorus acid byproduct by introducing PX.sub.3 (where X is a halide) into a reactor containing R--COOH at or above a specified temperature. The acylated HADPA can then be hydrolyzed and substantially pure HADPA obtained by vacuum distillation. Of particular importance is the addition of PCl.sub.3 to acetic acid at a temperature of between 105.degree. C. and 120.degree. C. to produce acetylated 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDPA).

REFERENCES:
patent: 3959360 (1976-05-01), Vazopolos

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