Benzpyrylium dyes, and processes for their preparation and use

Details Benzpyrylium dyes, and processes for their preparation and use Benzpyrylium dyes, and processes for their preparation and use

1993-03-29

1993-11-16

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549406, 549408, 549409, 549218, 548962, 548950, 548525, 548454, 546196, 544151, 540596, 540480, C07D31158, C07D41314, C07D40514

Patent

active

052625494

ABSTRACT:
4-[3-(benz[b]pyran-4-ylidene)prop-1-enyl]benz[b]pyrylium, 4-[5-(4H-benz[b]pyran-4-ylidene)penta-1,3-dienyl]benz[b]pyrylium and 4-[7-(4H-benz[b]pyran-4-ylidene)hepta-1,3,5-trienyl]benz[b]pyrylium dyes, wherein at least one of the benzpyrylium nuclei carries at its 2-position a substituent in which a non-aromatic carbon atom is bonded directly to the benzpyrylium nucleus, subject to the proviso that if the or each 2-substituent contains an aromatic nucleus, this aromatic nucleus is not conjugated with the benzpyrylium nucleus, are useful as visible and near infra-red absorbers, having high extinction coefficients and a reduced tendency to develop absorptions at shorter wavelengths when dispersed in polymeric media.

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