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An efficient, green and facile reaction has been reported between 2’-hydroxychalcones and hydrazine hydrate in 2-methoxyethanol in presence of catalytic amount of acetic acid under irradiation of tungsten light to afford 2-pyrazolines. Present methodology presents several advantages including simple reaction procedure, no need of catalyst/special apparatus and short reaction time giving quantitative yields of product.

An efficient and facile ring closure of 2’-hydroxychalcones under irradiation of tungsten light