Process of producing amino methylene phosphonic acids

Details Process of producing amino methylene phosphonic acids Process of producing amino methylene phosphonic acids

1973-12-11

1976-05-25

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 938

Patent

active

039593614

ABSTRACT:
Substantially pure amino methylene phosphonic acids, such as ethylene diamine tetra-(methylene phosphonic acid), nitrilo tris-(methylene phosphonic acid), and others are obtained in a high yield by reacting .alpha.-amino mono- or polycarboxylic acids which are substituted at their amino nitrogen atom, or their alkali metal salts with phosphorous acid and/or a phosphorus trihalogenide, preferably phosphorus trichloride in the presence or absence of an inert diluent.

REFERENCES:
patent: 3796749 (1974-03-01), Krueger et al.
patent: 3816517 (1974-06-01), Krueger et al.

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