Abstract
Rhodium(I) complexes [Rh(LL) 2]BF 4 with bidentate ligands LL (among which diphosphines) are able to catalyze the air oxidation of olefins in mild conditions and in (primary and secondary) alcohol solutions. The primary oxidation products are ketones, epoxides and allyl ethers. The selectivities for any one of the products depend on the nature of the olefin employed. Ketonization is predominant in the case of terminal linear alkenes and cyclooctene, while other cyclic olefins mainly yield products of allylic oxidation, as do terminal branched olefins. Acyclic internal olefins oxidize slowly to a mixture of ketones and allyl ether. In almost all cases little, but significant, epoxidation occurs.
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