New polymetine dyes from furo [3,2-f]-, furo [2,3-h] flavilium and 4-methyl furo [4′, 3′] flavilium salts

1Tolmachev, AI, Kudinova, MA, 1Kurdyukov, VV
1Institute of Organic Chemistry of the NAS of Ukraine, Kyiv
Dopov. Nac. akad. nauk Ukr. 2018, 6:98-104
Section: Chemistry
Language: Ukrainian

Symmetric and non-symmetric polymethine dyes based on 2,9-dimethyl-1,2-dihydrofuro[3,2-f]-, 4,8- dimethyl -8,9 dihydrofuro [2,3-h]- and 4-methylfuro[4′,3′]flavilium salts are synthesized. It is shown that the influence of the new heterocyclic residues — isomeric dihydrofuroflavilium systems — on the absorption spectra of synthesized dyes is expressed in the bathochromic shift of the long-wavelength absorption band and an increase of the absorption intensity in comparison with the corresponding 6-, 7- and 4'-methoxy substituted and unsub.

Keywords: absorption spectra, furo[3;2-f]- and furo[2;3-h] flavilium salts, polymethine dyes
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