| Abstract
| - The reaction of ground state boron atoms, 11B(2Pj), with allene, H2CCCH2(X1A1), was studied under singlecollision conditions at a collision energy of 21.5 kJ mol-1 utilizing the crossed molecular beam technique;the experimental data were combined with electronic structure calculations on the 11BC3H4 potential energysurface. The chemical dynamics were found to be indirect and initiated by an addition of the boron atom tothe π-electron density of the allene molecule leading ultimately to a cyclic reaction intermediate. The latterunderwent ring-opening to yield an acyclic intermediate H2CCBCH2. As derived from the center-of-massfunctions, this structure was long-lived with respect to its rotational period and decomposed via an atomichydrogen loss through a tight exit transition state to form the closed shell, C2v symmetric H−C⋮C−BCH2molecule. A brief comparison of the product isomers formed in the reaction of boron atoms withmethylacetylene is also presented.
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