Reaction of E-2-Arylidene-1-indanones, Z-Aurones, Z-1-Thioaurones and Z-2-Arylidene-2,3-dihydro-1H-indole-3-ones with Diazomethane.-The 1,3-dipolar cycloaddition of arylidene indanones and aurones (I) respectively affords trans-spiro-1-pyrazolines (III) as sole products. However the same reaction with arylidene thioaurones and -dihydroindolones yields trans cyclopropanes (V) as a result of the spontaneous denitrogenation of the initially formed pyrazolines. -(LEVAI, ALBERT; PATONAY, TAMAS; J. Heterocycl. Chem…
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