<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>A new method for the preparation of 7H-indolo[1,2-a]quinolinium solvatochromic dye precursors has been investigated. 5-(6-Hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate, 5-(5-bromo-6-hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate and 5-(5-nitro-6-hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate were obtained via demethylation of the corresponding 5-(5-X-6-methoxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium salts. The application of pyridinium hydrochloride in the demethylation of the methoxy perchlorates allowed to obtain the products with the almost quantitative yield in a very short time, especially when the reaction was carried out using microwave irradiation.</p></abstract>

A new method for the preparation of 7H-indolo[1,2-a]quinolinium solvatochromic dye precursors has been investigated. 5-(6-Hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate, 5-(5-bromo-6-hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate and 5-(5-nitro-6-hydroxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate were obtained via demethylation of the corresponding 5-(5-X-6-methoxynaphthyl-2)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium salts. The application of pyridinium hydrochloride in the demethylation of the methoxy perchlorates allowed to obtain the products with the almost quantitative yield in a very short time, especially when the reaction was carried out using microwave irradiation.

A new method for the preparation of solvatochromic 5-(5-X-6-hydroxynaphthyl-2)-7H-indolo[1,2-a]quinolinium merocyanines

Institute of Chemistry and Environmental Protection, Section of Instrumental Analysis, West Pomeranian University of Technology, Szczecin, ul. Piastów 42, 71-065 Szczecin, Poland

Polish Journal of Chemical Technology

A new method for the preparation of 7H-indolo[1,2-a]quinolinium solvatochromic dye precursors has been investigated....

A new method for the preparation of solvatochromic 5-(5-X-6-hydroxynaphthyl-2)-7H-indolo[1,2-a]quinolinium merocyanines

Published Online: Apr 08, 2010

Page range: 17 - 22

DOI: https://doi.org/10.2478/v10026-010-0004-3

Keywords
7H-indolo[1,2-a]quinolinium perchlorate, solvatochromic dye, pyridinium hydrochloride, microwave synthesis, demethylation

This content is open access.

A new method for the preparation of solvatochromic 5-(5-X-6-hydroxynaphthyl-2)-7H-indolo[1,2-a]quinolinium merocyanines

Published Online: Apr 08, 2010

Page range: 17 - 22

DOI: https://doi.org/10.2478/v10026-010-0004-3

Keywords7H-indolo[1,2-a]quinolinium perchlorate, solvatochromic dye, pyridinium hydrochloride, microwave synthesis, demethylation

This content is open access.

Keywords
7H-indolo[1,2-a]quinolinium perchlorate, solvatochromic dye, pyridinium hydrochloride, microwave synthesis, demethylation