magnesium bromide in diethyl ether; benzene T=-78 - 25°C; 0.5 h;

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diethyl ether

in diethyl ether at -78 to 23°C under Ar; 96-98 percent isomeric purity;

in diethyl ether (E)-propenyllithium (6.87 mmol) in Et2O soln. was added dropwise during45 min under Ar to a soln. of 2-bromo-2-propylboronate (6.21 mmol) in Et2O at -78°C;; distn. at 68-70°C (5 mm Hg)gve the product (98percent isomerically pure);

in diethyl ether T=-20°C;