The reaction of ground state boron atoms, 11 B( 2 P j ), with allene, H 2 CCCH 2 (X 1 A 1 ), was studied under single collision 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 11 BC 3 H 4 potential energy surface. The chemical dynamics were found to be indirect and initiated by an addition of the boron atom to the π-electron density of the allene molecule leading ultimately to a cyclic reaction intermediate. The latter underwent ring-opening to yield an acyclic intermediate H 2 CCBCH 2 . As derived from the center-of-mass functions, this structure was long-lived with respect to its rotational period and decomposed via an atomic hydrogen loss through a tight exit transition state to form the closed shell, C 2V symmetric H-CtC-BdCH 2 molecule. A brief comparison of the product isomers formed in the reaction of boron atoms with methylacetylene is also presented.
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