Synthesis of a series of novel 1,3-diphe nyl-4-arylspiropyrazolines[5.21]-11-tetralones has been accomplished in good yield by regioselective 1,3-dipolar cycloaddition of diphenylnitrilimine with (E)-2-arylidene-1-tetralones. X-ray crystal structure analysis of one of the products 4b confirms the structure and the regiochemistry of cycloaddition.
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Shanmugasundaram et al. (1999) studied this question.
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