in diethyl ether (Ar); to a soln. of 3,4,8-trimethyl-3-borabicyclo(4.3.1)decane was added at -60°C MeLi in ether; heating to 20°C, then cooled to -10 to 0°C; AcCl was added to the mixt.; stirred for 1 h at 20°C; ether was distd. off, and pentane was added to the residue; the ppt. was filtered off, and the solvent was removed from the filtrate; distn. of the residue gave 2-(3-methylene-5-methylcyclohex-1-yl)propyl(dimethyl)borane; elem. anal.;