Ethyl 3-(trifluoromethyl)-1H-pyrazole-4-carboxylate (2) A mixture of ethyl 3,3,3-trifluoro-2-oxo-butanoate (30.0 g, 0.16 mol), triethyl orthoformate (75.7 g, 0.33 mol) and acetic anhydride (49.0 g, 0.49 mol) was stirred at 120 °C for 12 h. The reaction mixture was concentrated ...