摘要: Abstract The energy of activation for ring-closure ground state triplet trimethylenemethane (I) to methylenecyclopropane has been measured by following the rate dissappearance electron spin resonance spectrum over temperature range –155° –140°, in a series frozen solid matrices. experiments described make use 3-methylenecyclobutanone and as precursors trimethylene-methane. Kinetic results obtained starting from were most satisfactory lead an 7 kcal/mole. This value is significantly smaller than aprpox. 20 kcal/mole barrier estimated on basis theoretical models. Truncation tunnelling mechanism made unlikely finding that trimethylenemethane-d6(I-d6) undergoes with same parent I.
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