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The Arrhenius parameters for addition of the allyl radical to allene were obtained. Experiments were conducted by use of an atmospheric flow apparatus at temperatures between 450 and 510°C. The allyl radical was prepared by pyrolyzing the vapor of diallyl oxalate. The activation energy and the A factor evaluated were 23kJ•mol-1 and 109.6cm3•mol-1•s-1, respectively. These values are comparable to those for addition of the ethyl or the propyl radical to ethylene. This result was contrary to the expectation that the activation energy to be obtained should be larger than that with the ethyl or the propyl radical by stabilization due to allyl-resonance. The energy levels of the allyl radical formed in the present experiment are discussed.

Activation Energy for Addition of Allyl Radical to Allene.