“…5.14-6.47 (complex multiplet including sharp singlet at 5.29, 9 H, vinyl protons, and -CH-C1S02-), 3.56 and 3.30 (AB pair, / = 13 Hz, 2 H, -CH2-S02-). Exposure of 5 to a slurry of powdered potassium -butoxide in anhydrous ether at ambient temperature for 4 hr resulted in smooth conversion to 1 which was purified by preparative vapor-phase chromatography at 110°( 10% SE-30 on Chromosorb G, 14% isolated yield).6,7 Hydrogenation of the colorless oil in methanol over 10% palladium on carbon proceeded with the constant uptake of 5 equiv of hydrogen and formation of previously characterized [4.4.2]propellane (6).5,8…”