1: MCPBA / CCl4; CH2Cl2 / -20 deg C, 15 min, then room t., 3 h 2: 80 percent / NaOAc / tetrahydrofuran / 2.5 h / Ambient temperature; in ultrasound laboratory cleaner 3: 1.) Zn foil, 1,2-dibromoethane / 1.) THF, heating to start boiling, then 30-35 deg C, 15-20 min, 2.) THF, 45-52 deg C View Scheme

1: 80 percent / NaOAc / tetrahydrofuran / 2.5 h / Ambient temperature; in ultrasound laboratory cleaner 2: 1.) Zn foil, 1,2-dibromoethane / 1.) THF, heating to start boiling, then 30-35 deg C, 15-20 min, 2.) THF, 45-52 deg C View Scheme

ethylene dibromide; zinc 1.) THF, heating to start boiling, then 30-35 deg C, 15-20 min, 2.) THF, 45-52 deg C; Yield given. Multistep reaction;