abstract |
Formula (I) wherein A is S or O; x is 0 or 1; a is SR 10 or N (R 11 ) (R 12 ); R 1 and R 2 are C 3 -C 24 alkyl, OR 10 , CF 3 or halogen; R 3 , R 4 and R 5 are hydrogen, C 1 -C 24 alkyl, OR 10 or halogen; or R 11 , R Two of the 21 , R 31 , R 4 and / or R 9 groups together form a C 1 -C 20 alkylene that is uninterrupted or interrupted by O, S, or NR 13. R 6 , R 11 , R 8 and R 9 are hydrogen, C 1 -C 24 alkyl; interrupted one or more times by non-continuous O atoms and are unsubstituted or OH and / or or a C 2 -C 24 alkyl which is substituted by SH; or R 6, R 7, R 8 and R 9, oR 10, halogen; or non Or a conversion, or C 1 -C 4 alkyl by phenyl which is substituted one or more times; R 10, R 11 and R 12, for example, hydrogen; X is, for example, be a (II) And R 2 ′ is one of the meanings of R 1 and R 2 ; and R 3 ′, R 4 ′ and R 5 ′ are one of the meanings of R 3 , R 4 and R 5. Are suitable as photoinitiators, particularly for irradiation with light of relatively long wavelengths. |