Methyne dyes and photographic elements

Details Methyne dyes and photographic elements Methyne dyes and photographic elements

1976-12-10

1978-03-21

Demers, Arthur P.

Harness for working animal

96120, 96130, 96131, 96143, 260250BC, 260288R, 260298, 260304R, 2603067, 260307D, 542436, 542428, 542429, 542435, 542466, 542446, 542475, 542471, 542474, 542442, 542443, 542444, 542472, 548325, C07D52100

Patent

active

040804968

ABSTRACT:
Novel methyne dyes comprising two auxochromic groups of the type used in a cyanine or merocyanine dye linked by a carbon atom chain wherein each of the carbon atoms have an unsaturated linkage to at least one adjacent carbon atom in the chain and at least one pair of carbon atoms in the chain being joined by a triple bond or, in an alternate resonance form, the chain including three consecutive carbon to carbon double bonds. The dyes are useful as spectral sensitizing dyes for silver halide emulsions and as intermediates for synthesizing chain-substituted methine dyes.

REFERENCES:
patent: 3414568 (1968-12-01), Collet et al.
Selvarajan et al., J. Org. Chem., 36 (1971) pp. 1679-1682.
Eiter et al., Annalen der Chemie, 682 (1965) pp. 62-70.
Reimlinger, Ang. Chem., 74 (1962) p. 252.

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