| abstract |
Novel indolenine methine dyes of formula (I) are claimed, in which ring A may be substituted; R<1> = hydrogen (H), (substituted) 1-13C alkyl (optionally with 1-4 ether oxygen (O) atoms in the chain), 3-4C alkenyl, 5-7C cycloalkyl or (substituted) phenyl; R<2> = (substituted) 1-13C alkyl (optionally with 1-4 ether O atoms in the chain), 3-4C alkenyl, (substituted) phenyl or NE<1>E<2>; E<1>, E<2> = H, (substituted) 1-13C alkyl (optionally with 1-4 ether O atoms in the chain), 3-4C alkenyl, 1-13C alkoxycarbonyl, 5-7C cycloalkyl-sulphonyl, pyridylcarbonyl, thienylcarbonyl or a (substituted) phenyl, pyridyl, 1-13C alkanoyl, 1-13C alkylsulphonyl, phenylsulphonyl, pyridylsulphonyl or benzoyl group; or NE<1>E<2> = a succinimido or phthalimido group, optionally substituted by 1-4C alkyl, or a 5-6-membered heterocyclic group, optionally containing other hetero-atoms. |