Process for making halogenated phosphonophosphoric acid-esters a

Details Process for making halogenated phosphonophosphoric acid-esters a Process for making halogenated phosphonophosphoric acid-esters a

1987-12-04

1990-01-16

Howard, Jacqueline V.

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

Organic compounds

Phosphorus esters

558115, 558163, 524123, C07F 920

Patent

active

048944696

ABSTRACT:
Halogenated phosphonophosphoric acid esters of the general formula ##STR1## in which X stands for a halogen
R' stands for an alkylene having from 1 to 4 carbon atoms
A stands for ##STR2## R'" stands for identical or different alkyl groups having from 1 to 4 carbon atoms, a halogen or hydrogen, and R.sup.IV stands for a halogen or hydrogen, are made. To this end, phosphorus (III) chloride is reacted in a first step with an alkylene oxide in the presence of a catalyst; the resulting reaction product consisting substantially of phosphorous acid trialkylesters is freed from alkylene oxide in excess and reacted in a second step with a suitable halogenoacyl halide in a molar ratio of 2:1-1.5; the resulting phosphonophosphoric acid ester is repeatedly scrubbed with water and/or an aqueous solution of ammonia and then either separated or halogenated in a third step under ultraviolet light, repeatedly scrubbed with water and/or an aqueous ammonia solution, and separated.

REFERENCES:
patent: 2934469 (1960-04-01), Baker et al.
patent: 4407103 (1978-03-01), Mazour
patent: 4407765 (1983-10-01), Hardy
Sasse, K., "Phosphorsaeurederivitate" in Houber-Weyl: Methoden der Organischen Chemie, Vol. XII/2, p. 352.

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