Photoactivable nitrogen bases
Compounds of the formula I R7″N—R6 RS—C,N—R4 H C, R′/I R, 3 R 2 (I) in which R, is an aromatic or heteroaromatic radical which is capable of absorbing light in the wave-length range from 200 nm to 650 nm and which is unsubstituted or substituted one or more times by C,—C,8alkyl, C2-C,ealkenyl, C2-C,8alkynyl, C,—C,ehaloalkyl, NO2, NR,OR, CN, OR,2, SR,2, C(O)R,3, C(O)OR,4, halogen or a radical of the formula II R˜—N′ R6 1 R5-C,N.R4 H I C—R3 I R2 (II) and which on absorption brings about a photoelimination which leads to the generation of an amidine group, R2 and R3 independently of one another are hydrogen, C,—C,ealkyl or phenyl which is unsubstituted or is substituted one or more times by C,—C,8alkyl, CN, OR,2, SR,2, halogen or C,—C,ehaloalkyl; R5 is C,—C,ealkyl or NR8R9; R4, R6, R, R8, R9, R,o and R independently of one another are hydrogen or C,—C,8alkyl; or R4 and R6 together form a C2-C,2alkylene bridge which is unsubstituted or is substituted by one or more C1-C4alkyl radicals; or R5 and R, independently of R4 and R6, together form a C2-C,2alkylene bridge which is unsubstituted or is substituted by one or more C1-C4alkyl radicals; or, if R5 is a radical NR8R9, R, and R9 together form a C2-C,2alkylene bridge which is unsubstituted or is substituted by one or more C1-C4alkyl radicals; and R,2, R,3 and R,4 independently of one another are hydrogen or C,—C,ealkyl; are suitable as photoinitiators for compounds which react under base catalysis.
1. A compound to of the formula
wherein Ar
is capable of absorbing light in the wavelength range from 200 nm to 650 nm, which on absorption brings about a photoelimination which leads to the generation of an amidine group and is unsubstituted phenyl, naphthyl, phenanthryl, anthryl, thienyl, thianthrenyl, anthraquinonyl, xanthenyl, thioxanthyl, phenoxathiinyl, carbazolyl, fluorenyl or phenoxazinyl;
or phenyl, naphthyl, phenanthryl, anthryl, thienyl, thianthrenyl, anthraquinonyl, xanthenyl, thioxanthyl, phenoxathiinyl, carbazolyl, fluorenyl or phenoxazinyl substituted one or more times by C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 1 -C 18 haloalkyl, NO 2 , NR 10 R 11 , CN, OR 12 , SR 12 , C(O)R 13 , C(O) OR 14 , halogen or a radical of the formula II
wherein
R 2 and R 3 are hydrogen,
R 4 and R 6 together form a propylene bridge;
R 5 and R 7 together form a propylene bridge or a pentylene bridge;
R 10 , and R 11 independently of one another are hydrogen or C 1 -C 18 alkyl;
R 12 , R 13 and R 14 independently of one another are hydrogen or C 1 -C 18 alkyl;
or Ar is a radical of the formula III
wherein R 15 is C 1 -C 18 alkyl, OH, CN, OR 10 , halogen or a radical of formula II; and n is 0 or 1.
2. A compound to of the formula
wherein Ar is capable of absorbing light in the wavelength range from 200 nm to 650 nm, which on absorption brings about a photoelimination which leads to the generation of an amidine group and is unsubstituted phenyl, naphthyl, phenanthryl, anthryl, thienyl, thianthrenyl, anthraquinonyl, xanthenyl, thioxanthyl, phenoxathiinyl, carbazolyl, fluorenyl or phenoxazinyl;
or phenyl, naphthyl, phenanthryl, anthryl, thienyl, thianthrenyl, anthraquinonyl, xanthenyl, thioxanthyl, phenoxathiinyl, carbazolyl, fluorenyl or phenoxazinyl substituted one or more times by C 1 -C 18 alkyl, C 2 -C 18 alkenyl, C 1 -C 18 haloalkyl, NO 2 , NR 10 R 11 , CN, OR 12 , SR 12 , C(O)R 13 , C(O)OR 14 , halogen or a radical of the formula II
wherein
R 2 and R 3 are hydrogen,
R 4 and R 6 together form a propylene bridge;
R 5 and R 7 together form a propylene bridge or a pentylene bridge;
R 10 , and R 11 independently of one another are hydrogen or C 1 -C 18 alkyl;
R 12 , R 13 and R 14 independently of one another are hydrogen or C 1 -C 18 alkyl;
or Ar is a radical of the formula III
wherein R 15 is C 1 -C 18 alkyl, OH, CN, OR 10 , halogen or a radical of formula II; and n is 0 or 1;
with the proviso that 8-benzyl-1,8-diazabicyclo[5.4.0]undecane is excluded.