Role of dioxygen as an activator in olefin metathesis

Abstract
Evidence is presented that the beneficial or essential influences often noted when small amounts of dioxygen are added to catalytic systems for olefin metathesis and ring-opening polymerization are due to the formation of epoxides and the corresponding metalla-oxacyclobutanes,[[graphic omitted]R1; fission of the latter affords initiating metallacarbenes but isomerization and dimerization of the epoxide via this metallacycle are the major reaction pathways.

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