A process for the production of benzophenone derivatives

摘要

A compound of general formula in which X<-> represents one equivalent of an anion; R<5> represents a hydrogen atom or a methyl group; each R<4> independently represents a methyl or ethyl group; and each of R<1> , R<2> and R<3> independently represents a hydrogen or halogen atom, an alkyl, alkoxy or alkylthio group having from 1 to 4 carbon atoms, an arylthio group or a group of formula in which R<4> , R<5> and X have the meanings given above, are useful as water soluble co-polymerisable photoinitiators.