1: 76 percent / 18 N H2SO4 / CH2Cl2 / 72 h / Ambient temperature 2: 28 percent / hexane; tetrahydrofuran / 2 h / -20 °C 3: 1.) bromotrimethylsilane, 2.) 95percent ethanol / 1.) CHCl3, RT, 2.) RT, 1 h View Scheme

1: 28 percent / hexane; tetrahydrofuran / 2 h / -20 °C 2: 1.) bromotrimethylsilane, 2.) 95percent ethanol / 1.) CHCl3, RT, 2.) RT, 1 h View Scheme

ethanol; trimethylsilyl bromide 1.) CHCl3, RT, 2.) RT, 1 h; Yield given. Multistep reaction;