abstract |
The present invention relates to a cyanine compound having excellent near-infrared ray shielding performance, and relates to an intermediate in which 1,1,2-trimethyl-1H-benzo [e] indole and methyl 4- (iodomethyl) benzoate are reacted in an acetonitrile solvent And (E) -2-chloro-1-formyl-3- (hydroxymethylene) -1-cyclohexene. |