By Paul de Mayo (Eds.)
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Some theoretical and experimental results have been presented suggesting the presence of a small barrier in going from the initially formed, nearly planar Sj molecules to the allylmethylene geometry, and it has been proposed that this process may be slow compared to radiationless decay without isomerization (63). More recent MO calculations, however, show no barrier in this process (6). Alternatively, it has been proposed that the Sj and S0 states might become nearly degenerate along the coordinate for cyclopropylmethylene biradical formation, and decay could occur without isomerization from a species in which bond formation (C-2—C-4 in 1,3-pentadiene) is incomplete (60,61).
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