Preparation of polycyclic dyes

Details Preparation of polycyclic dyes Preparation of polycyclic dyes

C - Chemistry, Metallurgy

09

B

C09B 57/00 (2006.01) C07C 205/56 (2006.01) C07D 493/04 (2006.01)

Patent

CA 2069457

SMC 36410 ABSTRACT PREPARATION OF POLYCYCLIC DYES A process for the preparation of a polycyclic dye of the Formula (1): Image Formula 1 by reacting a ketal ester of the Formula (2): Image Formula 2 with a benzofuranone of the Formula (3): Image 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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