Journal of heterocyclic chemistry

Bridged cyanine dyes. Part 1. 1??(N??methyl??4??pyridinio)??3??(N??methylpyridylene) cyclopenta??1, 4??dienes

AR Katritzky, WQ Fan, QL Li

文献索引：Katritzky, Alan R.; Fan, Wei-Qiang; Li, Qiao-Ling Journal of Heterocyclic Chemistry, 1988 , vol. 25, p. 1311 - 1314

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被引用次数: 7

摘要

Abstract 1, 3-Bis (N-methyl-4-pyridinio) propane is condensed with a series of α-diketones to form deep red monocyanine dyes 8. In strongly acidic solutions C-protonation occurs at the central carbon atom. A similar condensation with α-ketoesters yields zwitterionic cyanines 12 with extinction coefficients exceeding 10 5.