| abstract |
Compounds of formula (I), (II), and (III), wherein R 1 , R 2 , R′ 2 and R′″ 2 for example are C 1 -C 20 alkyl, provided that at least one of R 1 , R 2 , R′ 2 and R′″ 2 carries a specified substituent; R 3 , R 4 , and R 5 for example independently of one another are hydrogen or a defined substituent provided that at least one of R 3 , R 4 or R 5 is other than hydrogen or C 1 -C 20 alkyl; R 6 , R 7 , R 8 , R′ 7 , RV, R′ 8 , R″ 6 , R″ 7 , R′″ 6 and R′″ 7 for example independently of one another have one of the meanings as given for R 3 , R 4 , and R 5 ; and R 9 for example is C 1 -C 20 alkyl; exhibit an unexpectedly good performance in photopolymerization reactions. |