in diethyl ether; dichloromethane T=-70 - 20°C; 18 h; Product distribution / selectivity;

in diethyl ether molar ratio C6H5CH2MgCl:HfCl4 = 4:1; preparation in dry diethyl ether (-20 - 0°C, protective gas: N2);;

in diethyl ether byproducts: MgCl2, pyridine, C6H5CH3; (Ar); Hf-compound added to a soln. of organic compound under stirring at -40°C; stirred for 3 h at -30°C; filtered; dried in vacuo; extracted with hot pentane; cooled;