1: 1,3-bis-(trifluoromethyl)-benzene With n-butyllithium in diethyl ether T=-78°C; 2: tin(IV) chloride in hexane T=-78°C;

in diethyl ether; hexane byproducts: LiCl; (N2); Schlenk technique or glovebox; soln. of mixt. of Li compd. (2 equiv.) in Et2O was added dropwise to soln. of SnCl4 (1 equiv.) in hexane atroom temp. and stirred for 4 h; filtered; solvents removed (vac.); oily residue filtered; filtered-off residue washed (pentane; CH2Cl2); dried (vac.); recrystd. (pentane and Et2O); elem. anal.;