1: 1-bromo-2,3,4,5,6-pentafluorobenzene With isopropylmagnesium chloride in diethyl ether T=-78°C; 1.5 h; 2: tri-isopropoxy-borane in diethyl ether T=-78 - 20°C;

in toluene (Ar); using Schlenk techniques; charging of glass reactor with soln. of B(C6F5)3 (1 equiv.) in toluene; addn. of Ti(OCHMe2)4 (1 equiv.) at ambient temp., stirring for 45 min; removal of volatiles in vac., as oil; monitoring by NMR; extn. with hexanes; filtration, removal of solvent of filtrate; vac. distn. twice at 120-130°C/0.2 Torr;

in tetrahydrofuran (Ar); using Schlenk techniques; charging of glass reactor with soln. of B(C6F5)3 (1 equiv.) in THF; addn. of Ti(OCHMe2)4 (1 equiv.) at ambient temp., stirring for 90 min;

dihydrogen peroxide in water; 1,3,5-trimethyl-benzene T=10 - 20°C; 16.8 h;