| 摘要 |
SMC 36410 PREPARATION OF POLYCYCLIC DYES A process for the preparation of a polycyclic dye of the Formula (1): Formula 1 by reacting a ketal ester of the Formula (2): Formula 2 with a benzofuranone of the Formula (3): Formula 3 16 SMC 36410 wherein: Ring A is unsubstituted or is substituted by from one to three groups; Ring B is unsubstituted, apart from the nitro group, or is substituted by one or two additional groups; each R is independently alkyl. The polycyclic dyes described are useful for the coloration of synthetic textile materials especially polyesters.
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