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Upon irradiation in a halogen-doped xenon matrix at 10 K, methylenecyclopropane (5) undergoes a ring opening and trimethylenemethane (2) is formed. The identity of 2 is not only proven by its ESR spectrum, but under the specific conditions mentioned above, the concentration of 2 is high enough to also allow the observation of its IR spectrum. Comparison of the experimental IR spectra of 2 and several...