Multimer forms of acylphosphines and their derivatives

Abstract

Compounds of the formula (I), in which E is O or S; and x is 0 or 1, A is cyclopentyl, cyclohexyl, naphthyl, biphenylyl, anthracyl or an O-, S- or N-containing 5- or 6-membered heterocyclic ring, where the mentioned radicals are unsubstituted or substituted by halogen, C–Calkyl or C–Calkoxy; or A is a group formula (II) R is C–Calkyl, unsubstituted or substituted, C–Calkyl which is interrupted once or more than once by nonconsecutive O, S or NRand which is unsubstituted or substituted, C–Calkenyl which is uninterrupted or interrupted once or more than once by nonconsecutive O, S or NRand which is unsubstituted or substituted, C–Ccycloalkenyl which is uninterrupted or interrupted once or more than once by nonconsecutive O, S or NRand which is unsubstituted or substituted; C–Carylalkyl which is unsubstituted or substituted on the aryl group. C–Ccycloalkyl which is uninterrupted or interrupted once or more then once by O, S or NRand which is unsubstituted or substituted, C–Carylcycloalkyl or C–Carylcycloalkenyl; or, R is a group of the formula (III) W is a bond, —CO—O— or —CO—N(R)—; L a di-tri-or tetravalent linking group, n is a number of 2,3 or 4;