1: 98 percent / potassium tert-butoxide / tetrahydrofuran / 1.5 h / -78 °C View Scheme

1: 98 percent / potassium tert-butoxide / tetrahydrofuran / 1.5 h / -78 °C View Scheme

1: 98 percent / potassium tert-butoxide / tetrahydrofuran / 1.5 h / -78 °C View Scheme

1: 98 percent / potassium tert-butoxide / tetrahydrofuran / 1.5 h / -78 °C 2: 40 percent / cooper(II) acetylacetonate / tetrahydrofuran / 6 h 3: 1.) MCPBA, 2.) DABCO / 1.) chloroform, 2.) benzene, 95 deg C, 24 h View Scheme

1: 98 percent / potassium tert-butoxide / tetrahydrofuran / 1.5 h / -78 °C 2: 40 percent / cooper(II) acetylacetonate / tetrahydrofuran / 6 h 3: 1.) MCPBA, 2.) DABCO / 1.) chloroform, 2.) benzene, 95 deg C, 24 h View Scheme