Shigemitsu, Yasuhiro published the artcileSynthesis and electronic spectra of novel merocyanine dyes bearing a maleimide ring incorporated into the methine chains, Name: 1-Ethyl-2-methylquinolin-1-ium iodide, the publication is Dyes and Pigments (2003), 56(2), 167-179, database is CAplus.
The present article describes the synthesis of new polymethine dyes with a heterocyclic ring incorporated into the methine chain. 1-Alkyl-2- or 4-methylpyridinium salts and related compounds reacted at the exocyclic double bond with cyano- or methoxycarbonyl heterocycles bearing a methylthio group to give new polymethine dyes in good yield. This reaction occurred by an addition-elimination mechanism, involving nucleophilic attack of cyclic enamines at deficient carbon atoms on the heterocycles followed by elimination of MeSH. The polymethine dyes obtained are red, violet, and blue in color with absorption peaks at 524-614 nm. Semi-empirical as well as ab-initio quantum chem. calculations were used to theor. characterize their π-π absorption maxima in the visible region which plays a decisive role in their color appearances.
Dyes and Pigments published new progress about 606-55-3. 606-55-3 belongs to iodides-buliding-blocks, auxiliary class Quinoline,Salt, name is 1-Ethyl-2-methylquinolin-1-ium iodide, and the molecular formula is C13H10O3, Name: 1-Ethyl-2-methylquinolin-1-ium iodide.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com