1: 5-iodo-1,3-diphenyl-1H-pyrazole With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 2 h; Inert atmosphere; 2: N,N-dimethyl-formamide in tetrahydrofuran; hexane T=-78 - 20°C; 2 h; Inert atmosphere;