condensing with liq. N2;

boron trifluoride

boron trifluoride in gaseous matrix T=26.9 - 58.9°C; Kinetics;

methanol

in tetrahydrofuran presence of C2H5MgBr;

magnesium in tetrahydrofuran; toluene addn. of 50mmol F2C6H3Br in 20ml THF to 50mmol Mg-filings in 50ml THF at -20°C; warming to room temp. after 4h; stirring for 14h; dropwise addn. of the mixture to 17mmol BCl3*OMe2 in 70ml toluene at -20°C; warming to room temp. after 4h;; removal of solvent; refluxing with n-hexane for 4h; removal of Mg-salts by filtration; crystn. from the filtrate; recrystn. from n-hexane; detn. by (13)C-, (19)F-, (1)H-NMR, m.p., mass spectroscopy;;

dissociation given in different temp.;

in hexane byproducts: C2H6; in dry hexane;

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