N-Hydroxyalkyl-1-menthopyrazoles acted as a chiral catalyst for the diethylzinc (1) addition to aromatic aldehydes, and 1-aryl-1-propanols were afforded enantioselectively. These reactions were carried out optimally in toluene at 40 °C in the presence of 30 mol% of (2′S)-2-(2-phenyl-2-hydroxyethyl)-3-phenyl-1-men-thopyrazole ((S)-16d) to afford optically active 1-aryl-1-propanols up to 70% ee (S).