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Accounting for Diradical Character through DFT. The Case of Vinyl Allene Oxide Rearrangement.

The transformation of vinyl allene oxides into cyclopentenones is key to the biosynthesis of a number of hormone-like molecules in plants. Two competitive paths are generally accepted for this transformation: a concerted SN2-like mechanism and a stepwise path with a diradical oxyallyl intermediate. Recently, a new stepwise closed-shell path has been proposed that circumvents the key oxyallyl intermediate. In this work, we conduct a thorough computational investigation, including dynamic effects, to identify the most likely mechanism for this transformation.