hydrogenchloride; n-butyllithium; diisopropylamine in tetrahydrofuran Ar-atmosphere; dropwise addn. of BuLi to diisopropylamine (-78°C), addn. to B(O-iPr)3 and CH2Cl2, stirring (15 min, -78°C), bubbling of HCl to methyl orange endpoint; filtration off of iPr2NH*HCl, washing (ether), evapn. of solvents (vac., below 45°C), distn. (vac.);

hydrogenchloride in diethyl ether under N2; to cold (-98 °C) soln. of boron compd. in Et2O slowly added Cl2HCLi, stirred for 1 h, warmed to room temp., stirred for 3 h, cooled to 0 °C, added soln. of anhyd. HCl in Et2O, stirred for 0.5 h; decanted and combined with ether washes of solid, evapd. in air, distd.; elem. anal.;

Multistep reaction;

in tetrahydrofuran

in hexane