![]() ![]() Application of these principles will allow for the rapid identification of new reaction pathway bifurcations. Finally, the isosymmetry of the oxidopyrylium and cyclopentadiene molecular orbitals as well as the presence of “secondary orbital interactions” are emphasized as the common source of nonstatistical behavior. The absence of a post-transition state bifurcation in the related oxidopyridinium systems of Krenske and Harmata is rationalized. Key indicators of a pathway bifurcation (asynchronous bond formation, and a second transition state for the interconversion of the products) are also observed. Analysis of the potential energy surface (at the M06-2X/6-311+G(d,p) level of theory) in combination with Born–Oppenheimer molecular dynamics simulations (M06-2X/6-31+G(d)) demonstrate that both the (4 + 3)- and (5 + 2)-cycloaddition products are accessed from the same transition state. By drawing analogies from the dimerization of cyclopentadiene, a novel reaction pathway bifurcation is uncovered in the cycloaddition of oxidopyrylium ylides and butadiene.
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