Methyne dyes and photographic elements

Details Methyne dyes and photographic elements Methyne dyes and photographic elements

1975-04-14

1977-05-31

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

96120, 96130, 96131, 96143, 2602401, 2602404, 2602406, 2602409, 260250BC, 260260, 260288R, 260298, 260304R, 2603067R, 260307D, 260309, 2603092, C09B 2300

Patent

active

040268845

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.
Bourson, Bull. Soc. Chim. France, 1975, pp. 644-646.
Mee, J. Am. Chem. Soc. vol. 96, pp. 4712 to 4714 (1974).
Eiter et al., Annalen Der Chemie, vol. 682, pp. 62-70 (1965).
Selvarajan et al., J. Org. Chem. vol. 36, pp. 1679 to 1682 (1971).
Hamer, The Cyanine Dyes and Related Compounds, pp. 89, 464 and 478, Interscience Publishers (NY) 1964.

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