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Synthesis of 3-(1,2-benzisoxazole-3-yl) and 4-methyl-3-(1,2-benzisoxazole-3-yl)-1-benzopyran-2-ones and their florescence properties
The reaction of substituted 1,2-benzisoxazole-3-acetic acids (1) with 2-hydroxycarbonyl compounds (2) in the presence of acetic anhydride and triethyl amine yielded the title compound (7,8,9,10) in good yields. The fluorescence spectra of these compounds showed emission around 450 nm which has a very good optical brightening properties.
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Reference:
Benzisoxazole – Wikipedia,
,Benzisoxazole – an overview | ScienceDirect Topics