1 nation of elemental analysis and infrared and nmr spectra. Infrared bands at 5.62 pZ6 showed that the adduct was a cyclobutanone, and bands at 6.12 and 9.98 p demonstrated the presence of a terminal vinyl group. The nmr spectrumZ6 verified the presence of a terminal vinyl group and showed a methylene group adjacent to a carbonyl group. The methylene groups adjacent to the carbonyl group in cyclobutanone occur at 3.03 ppm, ...