Abd El-Aal, Reda Mahmoud published the artcileThe synthesis of some bridgehead heterocyclic monomethine cyanine dyes, Application In Synthesis of 606-55-3, the publication is Dyes and Pigments (1998), 39(4), 267-280, database is CAplus.
α-Chloroacetic acid and phenacyl bromide were used as reagents reacting with 8-hydroxyquinoline to form bridgehead heterocycles. Reaction of these heterocycles with equi- or dimolar ratios of ethiodides of α- or -γ-picoline or quinaldine afforded a series of monomethine and bismonomethine cyanine dyes. The electronic spectra of the monomethine cyanine dyes in various solvents are discussed.
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 C12H14IN, Application In Synthesis of 606-55-3.
Referemce:
https://en.wikipedia.org/wiki/Iodide,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com