1: 1 N HCl / tetrahydrofuran 2: 100 percent Turnov. / bis(pentafluorophenyl)borinic acid / tetrahydrofuran / 2 h / 17 °C / var. of reagent, solvent View Scheme

chloro-trimethyl-silane; bismuth(III) chloride in dichloromethane Yield given;

trimethylsilyl bromide in dichloromethane Ambient temperature; Yield given;