Facile synthesis of 2-(1,3-benzoxazol/benzothiazol-2-yl)-3H-benzo[f]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)-3H-benzo [f]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 ch...

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Bibliographic Details
Published in:South African journal of chemistry 2012-01, Vol.65 (1), p.5-9
Main Authors: Harishkumar, Hosanagara N., Mahadevan, Kittappa M., Masagalli, Jagadeesh N.
Format: Article
Language:English
Subjects:
Benzooxazolyl-3H-benzo[f]chromen-3-one
Benzothiazolyl-3H-benzo[f]chromen-3-one
Choline chloride/urea
Fluorescent brighteners
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Summary:A novel synthetic method was developed to prepare new fluorescent 2-(1,3-benzoxazol/benzothiazol-2-yl)-3H-benzo [f]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.
ISSN:0379-4350