1: 1-methyl-1H-pyrazole With n-butyllithium in tetrahydrofuran T=-78°C; 1 h; 2: benzaldehyde in tetrahydrofuran T=20°C; 16 h; 3: With water; ammonium chloride in tetrahydrofuran

water in N,N-dimethyl-formamide T=50°C; 0.0833333 h; Yield given;

1: 87 percent / CsF / dimethylformamide / 1. 40 deg C, 10 min 2. 40-60 deg C, 30 min 3. 60 deg C, 30 min 2: H2O / dimethylformamide / 0.08 h / 50 °C View Scheme

n-butyllithium; N,N,N',N,-tetramethylethylenediamine 1. hexane, ether, 3 h, -30 deg C 2. -30 deg C, 1 h 3. -> room temp., overnight; Yield given. Multistep reaction. Yields of byproduct given;