C. Reidlinger et al., STRUCTURE COLOR CORRELATIONS OF PENTAMETHINES AND HEPTAMETHINES - SYNTHESES WITH NITRILES XCIV, Dyes and pigments, 24(3), 1994, pp. 185-204
The synthesis of asymmetric cyanine dyes (penta- and heptamethines), p
repared by coupling Fischer's base with indandione, benzo[b]thiophene
and pyrazole derivatives via a C-1 unit, is described. Three different
synthetic strategies for substituted polymethines are presented Dye c
haracteristics are given and the correlation between the chemical stru
ctures and the dye properties are discussed by means of semiempirical
PPP calculations.