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Knoevenagel products 3 of 3-formylchromone (1) with isoxazol- 5-one 2, after reduction with NaBH4 and exposure to aqueous sodium nitrite/acetic acid and ferrous sulphate gave various benzopyranacetylenes 4 in good yield. IICT Communication No. 3850
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Sabitha et al. (1998) studied this question.
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