Chemistry of Heterocyclic Compounds p. 501 - 506 (1985)
Update date:2022-08-04
Topics:
Bespalov, B. P.
Abolin, A. G.
Rumyantsev, V. G.
The condensation of γ-pyrones with 1,3-bis(dicyanomethylene)indan leads to the corresponding deeply colored 2-(pyran-4-ylidene)-1,3-bis(dicyanomethylene)indans.The reaction of the latter with primary aliphatic or aromatic amines leads to replacement of the pyran oxygen by an amino group.The resulting compounds are zwitterions and possesses dichroic properties.The IR and UV spectra, and also the dichroic spectra of the compounds obtained in a liquid crystal are given.A qualitative explanation of the nature of the absorption bands of these compounds in the visible region of the spectrum is presented.
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