The preparations of cyclopropanone (1), methylcyclopropanone (2), 2,2-dimethylcyclopropane (3) and tetramethylcyclopropane (4), are described. The spectral properties of these molecules demonstrate unambiguously the ring closed structure for cyclopropanones. The reactions of cyclopropanones with methanol, diazomethane and furan are employed as chemical means of characterization.