oa South African Journal of Chemistry - Facile synthesis of 2-(1,3-benzoxazol/benzothiazol-2-yl)-3-benzo[]chromen-3-one as blue fluorescent brighteners : research article



A novel synthetic method was developed to prepare new fluorescent 2-(1,3-benzoxazol/benzothiazol-2-yl)-3-benzo []chromen-3-one derivatives 3a-p by the Knoevenagel condensation between 2-hydroxy-1-naphthaldehyde and benzothiazole-2-yl-aceatates or N-methyl benzoxazole-2-yl-acetates using choline chloride/urea ionic liquid as a green catalyst. The results of fluorescence studies revealed that all the compounds show moderate to low emission intensities and are expressed in the form of quantum yields.


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