Synthesis of tetraalkyl vinylidene diphosphonate monomer
AssigneeThe University of Tennessee Research Corporation
InventorSpiro D. Alexandratos
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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.
Claims23
A method of making a monomer of tetraalkyl vinylidene-1, 1-diphosphonate, comprising the steps of:
- (a) combining a secondary amine, a formaldehyde and a tetra (alkyl) methylene diphosphonate to form a first aqueous mixture;
- (b) maintaining the pH of said aqueous mixture above about 6 while reaction occurs in said mixture;
- and
- (c) refluxing said aqueous mixture to obtain a refluxed product of said monomer of tetraalkyl vinylidene-1, 1-diphosphonate.
A method of making a monomer of tetraalkyl vinylidene-1, 1-diphosphonate, comprising the steps of:
- (a) combining a secondary amine with water to form an aqueous amine solution;
- (b) combining a formaldehyde and a tetra (alkyl) methylene diphosphonate with said aqueous amine solution to form a first aqueous solution;
- (c) adjusting pH of said first aqueous solution to be between about 6 and 14;
- (d) refluxing said first aqueous solution for about 3 hours to form a refluxed product;
- and
- (e) purifying said refluxed product to produce said monomer.
A method of making a monomer of tetraalkyl vinylidene-1, 1-diphosphonate, comprising the steps of:
- (a) combining a secondary amine, a formalin and a tetra (alkyl) methylene diphosphonate to form a first aqueous mixture;
- and
- (b) refluxing said aqueous mixture to obtain a refluxed product of said monomer of tetraalkyl vinylidene-1, 1-diphosphonate.
The method as defined in claim 30 wherein said formalin is varied from about 0.1-1.0 moles.
Dependencies are inferred from the claim text.