Substituted squarylium dyes, and processes and intermediates for

Details Substituted squarylium dyes, and processes and intermediates for Substituted squarylium dyes, and processes and intermediates for

1991-11-20

1993-07-13

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549415, 549408, 549398, 549220, 549218, 549 28, 549 23, 549 13, 549 5, 548525, 548517, 548454, 546207, 546196, 546 66, 544151, 544149, 544145, 540 1, C07D31158, C07D30934, C07D33506, C07D34500

Patent

active

052274993

ABSTRACT:
Squarylium compounds of the formula: ##STR1## in which: Q.sup.1 and Q.sup.2 are each a Chromophoric group having an unsaturated system conjugated with the squarylium ring and such that in the compounds of formulae Q.sup.1 CH.sub.2 R.sup.1 and Q.sup.2 CH.sub.2 R.sup.2 the methylene hydrogens are active hydrogens;

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Fatiadi, A. J., New Bond-Delocalized (Dicyanomethylidene)croconate Derivatives: "Croconate Violet" and Croconate Blue, in West, R. (ed.), Oxocarbons, Academic Press (1980).
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