Process for the preparation of ethane-1,2-diphosphinic acid diesters
AssigneeHoechst Aktiengesellschaft
InventorsHans-Jerg Kleiner, Sigurd Rosinger
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Abstract
A process for the preparation of ethane-1,2-diphosphinic acid diesters of the formula ##EQU1## 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 ##EQU2## where R.sub.1 and R.sub.2 are as defined above, with acetylene using high-energy irradiation.
Claims7
In a process for the preparation of an ethane-1,2-diphosphinic acid diester of the formula ##EQU5## wherein R.sub.1 represents an alkyl, phenyl or phenalkyl group having from 1 to 18 carbon atoms and R.sub.2 is an alkyl group or a halogen substituted alkyl group having from 1 to 18 carbon atoms by reacting with acetylene a phosphorous acid ester of the formula ##EQU6## wherein R.sub.1 and R.sub.2 are as defined above, the improvement which comprises activating the reaction with high-energy irradiation.
Dependencies are inferred from the claim text.