Process for the preparation of triphenylmethane dyes

Details Process for the preparation of triphenylmethane dyes Process for the preparation of triphenylmethane dyes

1990-12-18

1993-03-30

Ivy, C. Warren

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

Organic compounds

Acyclic carbon bonded directly to three benzene rings or to...

552114, C07C22100

Patent

active

051985586

ABSTRACT:
A process for the preparation of triphenylmethane dye of the formula ##STR1## wherein R.sub.1 and R.sub.2 each denote hydrogen, C.sub.1 -C.sub.4 alkyl, benzyl or sulfobenzyl,

REFERENCES:
patent: 3927044 (1975-12-01), Foster et al.
patent: 4566999 (1986-01-01), Engelmann
patent: 5013857 (1991-05-01), Berneth et al.

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