Patent ID: 7041235

Claim:
A fluorescent diketopyrrolopyrrole analogue of the formula wherein A and A are C 1 –C 18 alkyl, C 2 –C 18 alkenyl, C 2 –C 18 alkynyl, C 5 –C 8 cycloalkyl, C 5 –C 8 cycloalkenyl, aryl or heteroaryl, A 3 and A 4 are independently of each other C 1 –C 18 alkyl, Ar 3 , —CR 30 R 31 —(CH 2 ) m —Ar 3 , or Y—R 32 , wherein R 30 and R 31 independently of each other stand for hydrogen or C 1 –C 4 alkyl, or phenyl which can be substituted up to three times with C 1 –C 3 alkyl, Ar 3 stands for aryl, C 5 –C 8 cycloalkyl, or heteroaryl, which can be substituted one to three times with C 1 –C 8 alkyl, C 1 –C 8 alkoxy, halogen or phenyl, which can be substituted with C 1 –C 8 alkyl or C 1 –C 8 alkoxy one to three times, and m stands for 0, 1, 2, 3 or 4, Y is —C(O)— or —SO 2 — and R 32 is C 1 –C 18 alkyl, Ar 3 , or aralkyl and A 3 can additionally be hydrogen, C 1 –C 8 alkyloxycarbonyl, or aralkyloxycarbonyl.