119607-60-2Relevant academic research and scientific papers
POLYMETHINE DYES BASED ON BENZOPYRYLIUM IONS
Makin, S. M.,Markina, T. A.,Boiko, I. I.
, p. 2182 - 2187 (2007/10/02)
A method is described for the synthesis of a series of benzopyrylium polymethine dyes by the acid cyclization of 2-hydroxystyryl polyenyl ketones, obtained by the successive crotonic condensation of aliphatic or alicyclic ketones initially with salicylaldehyde and its alkyl or halogen derivatives and then with aromatic aldehydes containing a p-methoxyphenyl or 9-alkylcarbazole fragment.The electronic absorption spectra of the new benzopyrylium dyes were studied.
