Abstract
Nineteen Δ2-pyrazolines hitherto undescribed in the literature are prepared by reacting thiophene and selenophene analogs of chalcones with phenylhydrazine or p-nitrophenylhydrazine. It is shown that thiophene and selenophene chalcones can be more easily cyclized than their furan analogs. The 2, 4, 6-trimethoxy group when present in the 1-(thienyl-2)-3-arylpropenone-1 molecule causes steric hindrance in the corresponding pyrazoline.
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