Abstract
The condensation of the anhydride of diglycolic acid with 2-aminothionaphthol has given naphtho[2,1-d]thiazol-2-ylmethoxyacetic acid, from which esters and the amide and hydrazide have been obtained. The lithium tetrahydroaluminate reduction of the methyl ester of the acid has given a carbinol which has been converted by reaction with phosphorus tribromide and subsequent heating into 8,9-dihydro-11H-naphtho[2′,1′∶4,5]thiazolo[2,3-c][1,4]oxazinium bromide. From this quaternary salt have been synthesized cyanine dyes, the deep coloration of which is due to the strong electron-donating action of the substituent in the a position of the polymethine chromophore.
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