| abstract |
Novel compounds of the formula II <IMAGE> (II) are described, in which M1 and M2 individually are -OH or together are -O-, X is -NO2, -OR', -SR' or SO2R' and the (R')s independently of one another are C1-20-alkyl, C3-5-alkenyl, C3-5-alkynyl, C2-4-monohydroxyalkyl, C1-12-halogenoalkyl, benzyl, C5-12-cycloalkyl, phenyl, carboxyphenyl, halogenophenyl, nitrophenyl, alkyl- or alkoxy-phenyl each having 1-4 C atoms in the alkyl or alkoxy moieties, or acetylaminophenyl, such as for example 3-n-butylthio-5-nitrophthalic anhydride. The compounds (II) in which M1 and M2 together are -O- are suitable as sensitizers for photo-crosslinkable polymers or as initiators for the photopolymerization of ethylenically unsaturated compounds or for the photochemical crosslinking of polyolefins, and those where M1 and M2 are -OH are useful intermediates for those wherein M1 and M2 together are -O-. |