diisopropylamine in diethyl ether byproducts: LiI; under Ar; n-BuLi and i-Pr2NH reacted in Et2O; cooled to -80°C; soln. of W complex and 12-crown-4 in Et2O slowly added; soln. of B compd. in Et2O dropped; stirred for 2.5 h upon warming to 0°C; solvent removed under vac.; dissolved in C6D6; detd. by NMR spectra;