in tetrahydrofuran; toluene stirring (room temp., 1 h); evapn., toluene addn., filtering, evapn., n-pentane addn., filtering, drying (vac.); elem. anal.;

in toluene T=-60 - 20°C; 2.5 h; Product distribution / selectivity;

1: pyridine With tri-isopropylsylil trifluoromethane sulfonate in dichloromethane T=20°C; 0.25 h; Inert atmosphere; 2: [Mg(benzyl)2] in dichloromethane T=-78 - -50°C; Inert atmosphere; 3: 24 h; In airneat (no solvent);