in dichloromethane under N2, freshly distd. 2-phenylpropene added dropwise to CH2Cl2 soln.of BHBr2*SMe2 with water bath (15°C), cooled, mixt. left overnight at room temp., 1,3-bis(trimethylsiloxy)propane added, stirred for 3 h; solvent and volatiles removed by aspirator vac.;