Abstract
6-Formyl-1,2,2,4-tetraalkyldi- and -tetrahydroquinolines have been synthesized by the Vilsmeier reaction and they are readily condensed with 1,3-indanedione to give 2-hetarylidene-1,3-indanediones. The latter exist as complexes with charge transfer from the quinoid structure of the heterocyclic fragment.
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REFERENCES
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Krysin, M.Y., Shikhaliev, K.S., Anokhina, I.K. et al. 6-(1,3-Dioxoindan-2-ylidenemethyl)-1,2,2,4-tetramethyl-1,2-dihydro- and 1,2,3,4-Tetrahydroquinolines. Chemistry of Heterocyclic Compounds 37, 227–230 (2001). https://doi.org/10.1023/A:1017523701357
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DOI: https://doi.org/10.1023/A:1017523701357