Patent ID: 7538104

Claim:
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.