In a round‐bottomed flask equipped with a reflux condenser, a solution of trans‐chalcone (50 mg, 4.8 mm ) and nitromethane (5 equiv, 24 mm ) was stirred in either methanol, ethanol, 2propanol, ethyl acetate, acetone, or acetonitrile solvents (50 mL). In the case of nitromethane as both solvent and reagent, trans‐chalcone (50 mg, 4.8 mm ) was directly dissolved in nitromethane (50 mL). To these solutions Amberlyst A21 or Amberlite IRA67 (50 mg) catalyst was added. After stirring the reaction mixture at 30–70 °C temperature for 24 h, conversions were determined by HPLC.
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