Direct positive dimethine cyanine dyes containing 1-aryl-2-heter

Details Direct positive dimethine cyanine dyes containing 1-aryl-2-heter Direct positive dimethine cyanine dyes containing 1-aryl-2-heter

1990-01-22

1991-04-02

Higel, Floyd D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07C40100

Patent

active

050048120

ABSTRACT:
Compounds as defined having a 1-phenylindole nucleus substituted in the 2-position with a 3-pyridyl group. Such compounds are useful in the preparation of cyanine dyes which can be used to sensitize silver halide emulsions for fogged direct-positive films.

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