Abstract
1-Alkyl- and 1-aryl-5, 6-benzolepidinium salts undergo cyanine condensation with 1-ethylquinolinium iodide in ethanol in the presence of basic condensation catalysts to give unsymmetrical monomethinecyanine dyes. The steric hindrance present in the molecules of these dyes is responsible for a low absorption intensity of ethanol solutions of these dyes.
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For Part LX see [2].
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Gorichok, Y.O., Pilyugin, G.T. & Gorichok, S.I. Researches on synthetic dyes. Chem Heterocycl Compd 2, 453–456 (1967). https://doi.org/10.1007/BF00509444
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DOI: https://doi.org/10.1007/BF00509444