Synthesis of tetraalkyl vinylidene diphosphonate monomer

Details Synthesis of tetraalkyl vinylidene diphosphonate monomer Synthesis of tetraalkyl vinylidene diphosphonate monomer

1993-10-05

1995-08-15

Ramsuer, Robert W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

558161, C07F 940

Patent

active

054420857

ABSTRACT:
A method of making a monomer of tetraalkyl vinylidene-1, 1-diphosphonate. The monomer is manufactured by combining an aqueous secondary amine solution with a formaldehyde and a tetra (alkyl) methylene diphosphonate. The resulting mixture is maintained at a pH above about 6 and refluxed for two hours to enable reaction to produce the monomer of tetraalkyl vinylidene-1, 1-diphosphonate. The product monomer is then purified to produce the final end product.

REFERENCES:
patent: 3686290 (1972-08-01), Carroll
patent: 4939284 (1990-07-01), Degenhardt
Charles R. Degenhardt & Don C. Burdsall, "Synthesis of Ethenylidenebis (phosphonic acid) and Its Tetraalkyl Esters," J. Org. Chem. 51, pp. 3488-3490 (1986).
Lehnert W., Tetrahedron, 30, pp. 301-305 (1974).

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