Alkane-bisalkyl-phosphinic anhydrides and process for the manufacture of alkane-phosphonic anhydrides and alkane-bis alkyl-phosphinic anhydrides
AssigneeHoechst Aktiengesellschaft
InventorsHans-Jerg Kleiner, Walter Dursch
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Abstract
Alkane-bisalkylphosphinic anhydrides consisting of repeating units of the formula ##STR1## and process for the manufacture of alkane-phosphonicanhydrides and alkane-bisalkyl-phosphonic anhydrides consisting of repeating units of the formula ##STR2## wherein alkane-phosphonic acids or alkane-bisalkyl-phosphinic acids of the formula ##STR3## are heated to 250.degree. to 450.degree. C. under reduced pressure while splitting off water.
Claims3
A process for the manufacture of alkane-phosphonic anhydrides and alkane-bisalkyl-phosphinic anhydrides of the formula II ##STR8## in which R.sub.1 and R.sub.2 are alkyl having from 1 to 20 carbon atoms, A is alkylene having from 1 to 20 carbon atoms, x is zero or 1 and y is an integer equal to or greater than 1, which comprises heating to 250.degree. to 450.degree. C. an alkane-phosphonic acid or alkane-bisalkyl-phosphinic acid of the formula III ##STR9## in which R.sub.1, R.sub.2 and x have the aforesaid meaning, under reduced pressure and with splitting off of water.
Dependencies are inferred from the claim text.