1: With n-butyllithium in diethyl ether; hexane T=-60°C; Metallation; 2: With tri-isopropoxy-borane in diethyl ether; hexane T=-70°C; boronation; 3: With hydrogenchloride in diethyl ether; hexane Hydrolysis;

n-butyllithium in diethyl ether; hexane n-BuLi in 2.5 M hexane soln. was added to ethereal soln. of C6F4H between -70 and -75 °C, 1.5 equiv. of cold (-70 °C) B(OMe)3 soln. was added in ether, mixt. was kept for 1 h below -60 °C, warmedup to 15-18 °C within 1 h; hydrolysis with 10 percent HCl, org. layer was sepd., aq. layer was twice extd. with ether, extracts were combined, dried with MgSO4, evapd. under vac., recrystn. from toluene, elem. anal.;

in methanol; water 33percent H2O in MeOH, 20 °C, several h; monitored by (19)F NMR;