Process for the manufacture of vinyl phosphonic acid derivatives
AssigneeHoechst Aktiengesellschaft
InventorsWalter Dursch, Hans-Jerg Kleiner
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Abstract
Process for the manufacture of vinyl phosphonic acid derivatives of the formula ##STR1## with R.sub.1 being hydrogen or alkyl with 1 to 4, preferably 1 to 2, carbon atoms and n being 1 or 2, which comprises heating to 150.degree.-270.degree. C., preferably 170.degree. to 230.degree. C., 2-acetoxyethane phosphonic acid dialkyl esters of the formula ##STR2## with R.sub.2 being alkyl with 1 to 4, preferably 1 to 2, carbon atoms, in the presence of acidic or basic catalysts.
Claims4
A process for the manufacture of a vinyl phosphonic acid derivative of the formula ##STR5## wherein R.sub.1 is hydrogen of alkyl having 1 to 4 carbon atoms and n is 1 or 2, said process comprising heating to 150.degree.-270.degree. C. a 2-acetoxyethane phosphonic acid dialkyl ester of the formula ##STR6## wherein R.sub.2 is alkyl having 1 to 4 carbon atoms in the presence of a catalytic amount of an acidic or basic catalyst.
Dependencies are inferred from the claim text.