| abstract |
PCT No. PCT/EP92/00660 Sec. 371 Date Jul. 20, 1993 Sec. 102(e) Date Jul. 20, 1993 PCT Filed Mar. 25, 1992 PCT Pub. No. WO92/17548 PCT Pub. Date Oct. 15, 1992.Indolizinetrimethine dyes useful for laser-optical recording media have the formula <IMAGE> I where the variables are defined as follows: R1 is C1-C22-alkyl which may be substituted by halogen, hydroxyl, C1-C6-alkoxy, benzyloxy, C1-C6-alkanoyl, C1-C6-alkoxycarbonyl or phenyl, C3-C7-cycloalkyl, which may be substituted by halogen, C1-C4-alkyl or C1-C4-alkoxy, or phenyl which may be substituted by halogen, hydroxyl, cyano, C1-C6-alkyl, C1-C6-alkoxy, carboxyl, C1-C6-alkoxycarbonyl or hydroxysulfonyl, R2 has one of the meanings of R1, except than the carbon chain of C1-C22-alkyl may be interrupted by from one to five oxygen atoms in ether function, R3 is hydrogen, halogen or C1-C6-alkyl, Z is -O- or -NH-, and An(-) is one equivalent of an acid anion. |