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• W71002312 endingPage "68" @default.
• W71002312 startingPage "36" @default.
• W71002312 abstract "This chapter focuses on catalytic enantioselective direct CH oxygenations. Recent great progress in this area has relied on activated CH bonds of benzylic, allylic, and heterocyclic substrates. For enantioselective benzylic oxidation, chiral porphyrin, salen, and other metal complexes inspired by biological oxidation serve as effective catalysts. The strategy of asymmetric desymmetrization enables enantioselective transformations of meso -cyclic ethers and amines by catalytic α CH oxidation. Enantioselective allylic oxidation is feasible dominantly with chiral copper catalysts (the Kharasch–Sosnovsky reaction), but palladium systems work as well albeit yet with limited applications. The enantioselectivity reaches very high levels in several cases, but there is still great room for improvement in catalyst turnovers, scope of substrates, stoichiometric balance of substrate and cooxidant, atom-efficiency of cooxidants. However, enantioselective oxidation of unactivated CH bonds is a formidable challenge in asymmetric synthesis. Some promising studies related to this subject are also highlighted." @default.
• W71002312 created "2016-06-24" @default.
• W71002312 creator A5044761027 @default.
• W71002312 date "2012-01-01" @default.
• W71002312 modified "2023-09-27" @default.
• W71002312 title "5.2 Oxidation: C–O Bond Formation by C–H Activation" @default.
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