Abstract
Selective esterification of purified Rose Bengal and Eosin Y have been carried out by reaction with methyl iodide, benzyl chloride or p-isopropylbemyl chloride. The lactonic form of each dye reacts with diazomethane producing mixtures of the monomethyl ether and the dimethyl ether of the lactone, and the methyl ether of the methyl ester of the tautomeric quinonoid form. On heating, Rose Bengal decarboxylates in dimethylformamide solution, while Eosin Y loses a bromine atom in dimethylsulphoxide. The structures of all the products obtained have been studied by the usual Spectroscopic techniques. HPLC data are also reported.
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