Preparation of polycyclic dyes

Details Preparation of polycyclic dyes Preparation of polycyclic dyes

1992-06-15

1993-05-25

Dentz, Bernard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

560 60, C07D30777

Patent

active

052141616

ABSTRACT:
A process for the preparation of a polycyclic dye of the Formula (1): ##STR1## by reacting a ketal ester of the Formula (2): ##STR2## with a benzofuranone of the Formula (3): ##STR3## wherein: Ring A is unsubstituted or is substituted by from one to three groups:

REFERENCES:
patent: 3549699 (1970-12-01), Simon

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