Process for preparing phosphorus-containing dicarboxylic acids a

Details Process for preparing phosphorus-containing dicarboxylic acids a Process for preparing phosphorus-containing dicarboxylic acids a

1996-09-05

1997-12-02

Deej, Jose G.

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

Organic compounds

Phosphorus esters

558 87, 568 11, 568 14, 568 15, C07F 902

Patent

active

056938420

ABSTRACT:
The invention relates to a process for preparing phosphorus-containing compounds of the formula I ##STR1## in which R.sup.1 and R.sup.2 are an alkyl radical having 1 to 8 carbon atoms, a cyclohexyl radical, a cyclopentyl radical, an aryl radical or a halogen-, alkyl- or alkoxy-substituted aryl radical, where R.sup.1 and R.sup.2 together with the phosphorus atom can also form a ring, n and m=0 or 1 and R.sup.3 and R.sup.4 are alkyl radicals having 1 to 4 carbon atoms or n=0, m=0 or 1 and R.sup.3 and R.sup.4 are H, by adding compounds of the formula II ##STR2## into dialkyl esters of fumaric acid or of maleic acid of the formula (III) or dialkyl esters of itaconic acid of the formula (IV) ##STR3## in which R.sup.3 and R.sup.4 have the meaning given above, and, optionally reacting an alkyl ester of a phosphorus-containing dicarboxylic acid of the formula (I), where n=0, with water in the presence of catalytic amounts of an acid to give the phosphorus-containing dicarboxylic acid.

REFERENCES:
Chemical Abstracts, Abstract No. 088714, vol. 75, No. 13, "Phosphinic and phosphinous acid derivatives..."(Sep./1971).
Journal of the American Chemical Society, vol. 78, "Disubstituted Phosphine Oxides. III. Addition to alpha, beta-Unsaturated Nitriles and Carbonyl Compounds", pp. 5299-5303 (1956).
Chemical Abstracts, Abstract No. 059359, vol. 121, No. 6, "Epoxy resin-based thermosetting resin films..."(Mar./1994).
Kleiner, H-J, Liebigs Ann. Chem. 1974: 751-764.

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