1: 95 percent / PPh3; imidazole; I2 / CH2Cl2 / 3 h 2: 83 percent / NaBH4 / methanol 3: 74 percent / 2,2-di-Me-5-[3-(diphenylstannyl)propyl]-1,3-dioxolan-4-one; AIBN / benzene / 5 h / Heating View Scheme