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- W2895987672 abstract "Abstract Density functional theory calculations were employed to elucidate the mechanism of Mn‐catalyzed chemoselective hydroarylation reactions. The Mn‐catalyzed [4+2] annulation undergoes a reaction pathway involving sequential imine‐directed C−H bond cleavage, alkyne insertion into the Mn−C bond, β‐oxygen elimination and outer catalytic cycle annulation–aromatization. Computational results demonstrated that the previously proposed chelation‐assisted alkyne insertion process was unfavorable owing to the weak coordination ability of the β‐oxygen leaving group compared with that of CO. Further noncovalent interactions analysis indicated that the origin of the high regioselectivity was contributed to the steric repulsion resulting from significant nonbonding overlap between the reacting aryl moiety and the quaternary carbon group of the reactant in the alkyne insertion step. In addition, in the Brønsted‐acid‐mediated chemoselective alkenylation reaction, the used terminal alkynes had relatively enhanced reactivity in the alkyne insertion step owing to its reduced steric repulsion. From the active alkenyl‐Mn intermediate, the activation free energy of protonation and β‐oxygen elimination are approximate, thus the alkenylated product is obtained after protonation in an acidic system. We expect that this detailed mechanistic study will significantly enhance our ability to develop Mn‐catalyzed arene C−H bond functionalization reactions." @default.
- W2895987672 created "2018-10-26" @default.
- W2895987672 creator A5006775539 @default.
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- W2895987672 date "2018-10-30" @default.
- W2895987672 modified "2023-10-14" @default.
- W2895987672 title "Mechanistic Insights into Manganese (I)‐Catalyzed Chemoselective Hydroarylations of Alkynes: A Theoretical Study" @default.
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- W2895987672 doi "https://doi.org/10.1002/cctc.201801301" @default.
- W2895987672 hasPublicationYear "2018" @default.
- W2895987672 type Work @default.