bromine; phenyl-magnesium bromide in diethyl ether under Ar or N2, etheral soln. of boronic ester was stirred at -78°C during addn. of bromine, add. of equiv. amt. of phenyl magnesium bromide, react. at 20°C for 16 h; mixt. concd., worked up with 10 percent phosphoric acid and ether, distd., elem. anal.;

in tetrahydrofuran under Ar, stirred at 0°C, addn. of 1 equiv. of n-BuBr, stirred at 20-25°C for 2-12 h; addn. of excess cold 10 percent phosphoric acid, prod. extd. with ether, distd.;

methyl iodide in tetrahydrofuran under Ar, stirred at 0°C, addn. of 1 equiv. of CH3I, stirred at 20-25°C for 2-12 h; addn. of excess cold 10 percent phosphoric acid, prod. extd. with ether, distd., elem.anal.;