promising as good dienophiles, which were easily converted into the desired carboxylic derivatives. Bis(pyrazolyl)methanes, which were derived from chiral pyrazoles, showed the activity of chiral catalyst. Particularly 10 mol% of bis(isomenthopyrazol-1,1′-yl)methane (8a) catalyzed enantioselectively the DielsAlder reaction up to 40 % ee by the formation of complex with Mg(ClO4)2.