The resent invention provides dyes of the general formula (I) where processes for their H 1 is hydrogen, (C
1 -C
6 )-alkyl, (C
1 -C
4 )-alkoxy, hydroxyl, halogen, -NHCHO, -NHCO(C
1 -C
6 )-alkyl, -NHCOaryl, -NHSO
2 (C
1 -C
6 )-alkyl or -NHSO
2 aryl; R
2 is hydrogen, (C
1 -C
6 )-alkyl, C
1 -C
4 )-alkoxy, phenoxy or halogen; R
3 is hydrogen, (C
1 -C
6 )-alkyl, substituted (C
1 -C
6 )-alkyl, (C
3 -C
4 )-alkenyl or, substituted (C
3 -C
4 )-alkenyl; or R
2 and R
3 combine to form the radical -C*H(CH
3 )CH
2 C(CH
3 )
2- , where the carbon atom marked * is attached to the phenyl nucleus; R
4 is hydrogen, (C
1 -C
6 )-alkyl or phenyl; R
5 is vinyl or a group of the formula -CHR
6 COR
7 , where R
6 is hydrogen, (C
1 -C
6 )- alkyl or phenyl; R
7 is (C
1 -C
6 )-alkyl, substituted (C
1 -C
6 )-alkyl, phenyl or substituted phenyl; and X is (C
1 -C
5 )-alkylen.