Process for the preparation of ethane-1,2-diphosphinic acid dies

Details Process for the preparation of ethane-1,2-diphosphinic acid dies Process for the preparation of ethane-1,2-diphosphinic acid dies

1975-04-25

1977-01-04

Raymond, Richard L.

Chemistry of carbon compounds

Dipeptides, e.g., aspartame, anserine, carnosine, etc.

204158R, C07F 940

Patent

active

040013529

ABSTRACT:
A process for the preparation of ethane-1,2,-diphosphinic acid diesters of the formula ##STR1## where R.sub.1 represents alkyl, phenyl and/or phenalkyl groups having from 1 to 18 carbon atoms and R.sub.2 alkyl groups having from 1 to 18 carbon atoms, which may be optionally substituted by halogen atoms, which comprises reacting phosphonous acid esters of the formula ##STR2## where R.sub.1 and R.sub.2 are as define above, with acetylene in the presence of catalytic amounts of radical-forming agents and/or with UV irradiation.

REFERENCES:
patent: 2957931 (1960-10-01), Hamilton et al.
patent: 3812222 (1974-05-01), Kleiner et al.

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