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- W4211144004 endingPage "74" @default.
- W4211144004 startingPage "1" @default.
- W4211144004 abstract "Abstract Molybdenum‐catalyzed nucleophilic substitutions of allylic acetates and carbonates proceed with high site‐ and stereoselectivity. Monosubstituted allylic substrates yield branched products, in contrast to what is commonly observed in reactions catalyzed by palladium complexes. High enantioselectivities are observed in the presence of pyridinylamide and oxazolinylamide ligands. The range of nucleophiles that undergo reaction is somewhat limited and includes malonates, cyano esters, α‐imino esters and lactones, oxalactimes, and oxindoles. The reactions proceed via oxidative addition of the substrate to a ligated Mo(0) species forming an asymmetric η 3 ‐allylmolybdenum(II) complex, coordination of the nucleophile to the metal, and final reductive elimination to form the product. Overall retention of configuration is observed as a result of retentive oxidative addition and retentive nucleophilic attack. Equilibration of intermediate η 3 ‐allyl complexes is usually rapid in comparison to nucleophilic attack, which leads to the formation of a single major η 3 ‐allyl complex. As a consequence, close to equal mixtures of enantiomers and constitutional isomers are obtained from enantioenriched or racemic branched substrates as well as from linear substrates." @default.
- W4211144004 created "2022-02-13" @default.
- W4211144004 creator A5081183613 @default.
- W4211144004 date "2014-04-12" @default.
- W4211144004 modified "2023-10-17" @default.
- W4211144004 title "Molybdenum‐Catalyzed Asymmetric Allylic Alkylations" @default.
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