The first reported 1,3‐dipolar cycloaddition of 2‐styrylchromones with diazomethane afforded 4‐aryl‐3‐(2‐chromonyl)‐2‐pyrazolines. However, 3‐aryl‐4‐(2‐chromonyl)‐1‐pyrazolines have been also found as minor products of this reaction. These two series of pyrazolines have been fully characterized.
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Pinto et al. (1998) studied this question.
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