Improved process and method for the preparation of...

Details Improved process and method for the preparation of... Improved process and method for the preparation of...

C - Chemistry, Metallurgy

09

B

C09B 23/00 (2006.01) C07D 209/04 (2006.01) C09B 23/06 (2006.01) C09B 23/08 (2006.01)

Patent

CA 2363896

A process for preparing an asymmetrical indocyanine dye characterised in that it comprises the steps of: a) reacting a first quaternised indolenine or substituted indolenine with a compound of the formula (II) Image or hydrochloride thereof, wherein n is 0 or 1 Ph is phenyl or substituted phenyl X is hydrogen, halogen or alkyl, preferably chlorine, in a solvent selected from the group consisting of acetic acid, acetic anhydride and mixtures thereof in the presence of acetyl chloride, to obtain an intermediate hemicyanine, and b) further reacting said intermediate hemicyanine with a second quaternised indolenine or substituted indolenine different from said first indolenine.

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