bromine in neat (no solvent) byproducts: MeSSMe; N2-atmosphere, absence of light; dropwise addn. of stoich. amt. of Br2 to borane (-63°C, stirring), stirring for 15 min with warming to room temp.; removal of Me2S2 (reduced pressure), fractional distn. (reduced pressure);

air; bromine in tetrahydrofuran byproducts: hexane; N2-atmosphere; treatment of B2H6 with olefin, addn. of MeSH (stirring), injecting small amt. of air (in two steps during 2 h), stirring for 20 h, addn. of stoich. amt. of Br2 (-63°C, absence of light); evapn. of volatiles (reduced pressure), fractional distn. (reduced pressure);

dimethylsulfide borane complex in pentane special exptl. techniques used in handling air and moisture sensitive materials; to soln. of B(C6H13)3 in pentane added BBr3 ( molar ratio of educts 2:1) followed by slow addn. of BH3*SMe2 in pentane at 0 °C,stirred at room temp. for 4 h; evapd., distd.;

1: tetrahydrofuran 2: Br2 View Scheme