Yanagi, Kiyoshi published the artcileStudy on the syntheses of polymethinecyanines. I. The reactions of 3-phthalimido-2-propenal and its derivatives with active methyl and methylene compounds, Quality Control of 606-55-3, the publication is Nippon Kagaku Kaishi (1991), 1198-203, database is CAplus.
3-Phthalimido-2-propenal (I), its derivatives and related compounds reacted with various active Me and active methylene compounds to produce pentamethinecyanines and imido-substituted polymethinecyanine-like compounds E.g., reaction of I with benzothiazolium iodides II (R = Me, Et) in Ac2O and AcOH in the presence of KOAc gave the corresponding pentamethinecyanines III in 87 and 90% yield resp.
Nippon Kagaku Kaishi 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 C6H16OSi, Quality Control of 606-55-3.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com