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vol.65An efficient and convenient protocol for the synthesis of optically active 1,2,4-triazolo-[3,4-b]-[1,3,4]-thiadiazole, 1,3,4-oxadiazole and 1,3,4-thiadiazole derivatives having L-Amino acid moietiesA highly efficient solvent-free acetalization of aldehydes to 1,1-diacetates catalyzed by SiO2-Pr-SO3H índice de autoresíndice de assuntospesquisa de artigos
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South African Journal of Chemistry

versão On-line ISSN 1996-840X
versão impressa ISSN 0379-4350

Resumo

HARISHKUMAR, Hosanagara N.; MAHADEVAN, Kittappa M.  e  MASAGALLI, Jagadeesh N.. Facile synthesis of 2-(1,3-benzoxazol/benzothiazol-2-yl)-3H-benzo[f]chromen-3-one as blue fluorescent brighteners. S.Afr.j.chem. (Online) [online]. 2012, vol.65, pp.05-09. ISSN 1996-840X.

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.

Palavras-chave : Benzooxazolyl-3H-benzo[f]chromen-3-one; benzothiazolyl-3H-benzo[f]chromen-3-one; choline chloride [urea]; fluorescent brighteners.

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