triethylamine in benzene 2 h; Heating;

in acetonitrile 1 h; Heating;

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in hexane under protective gas; solution was heated 1 h at 70 °C; cooling;; solid was separated, washed (hexane/CH2Cl2) and dried; filtrate contains B(NMe2)3;;

in acetonitrile equiv. amts., boiling;

n-butyllithium in diethyl ether; hexane byproducts: LiCl; under N2; BuLi in hexane is added dropwise to a soln. of Me2S(O)NSiMe3 in ether, then a soln. of the borolidine in ether is added dropwise, refluxed; LiCl is sepd., the solvent is evapd., the oily residue is distd.;