iodine in tetrahydrofuran T=20 - 80°C; 20 h;

in diethyl ether N2 atmosphere; addn. of soln. of MeMgBr in Et2O to soln. of B-compd. in Et2O(room temp.), stirring (1 h, room temp.), addn. of p-vinylmagnesiumbromide, stirring (overnight, room temp.); filtn., removal of solvent, extn. (hexane), filtn., removal of solvent, recrystn. (hexane); elem. anal.;

dilithium tetrachlorocuprate; ethylmagnesium bromide 1.) THF, Et2O, 2.) from -30 to -25 deg C; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

dilithium tetrachlorocuprate; ethylmagnesium bromide 1.) THF, Et2O, 2.) from -30 to -25 deg C; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

dilithium tetrachlorocuprate; ethylmagnesium bromide 1.) THF, Et2O, 2.) from -30 to -25 deg C; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

in diethyl ether N2 atmosphere; addn. of soln. of MeMgBr in Et2O to soln. of B-compd. in Et2O(room temp.), stirring (1 h, room temp.), addn. of p-vinylpehnylmagnesium bromide, stirring (overnight, room temp.); sublimation (40°C, 4Pa, 9 h); elem. anal.;

in tetrahydrofuran T=25 - 80°C; 15 h;