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- W2046352304 abstract "A Hammett analysis of platinum-mediated oxy-insertion into Pt–aryl bonds is performed using DFT calculations. Modeled transformations involve the conversion of cationic PtII-aryl complexes [(Xbpy)Pt(R)(OY)]+ (R = p-X-C6H4; Y = 4-X-pyridine; Xbpy = 4,4′-X-bpy; X = NO2, H, NMe2) to the corresponding [(Xbpy)Pt(OR)]+ complexes via an organometallic Baeyer–Villiger (BV) pathway. Computational modeling predicts that incorporation of an electron-deficient NO2 group at the 4-position of pyridine-N-oxide lowers the activation barrier to the organometallic BV transformation. In contrast, computational studies reveal that increasing the donor ability of the migrating aryl group, by placement of NMe2 at the para position, lowers the activation barrier to the oxy-insertion step. The impact on the calculated activation barrier is greater for variation of the R group than for modification of Y of the oxygen delivery reagent. For the p-NO2/p-NMe2-substituted aryl migrating groups (R), the ΔΔG‡ for X = NMe2 versus X = NO2 is 12 kcal/mol, which is three times larger than that calculated for the changes that occur upon substitution of NO2 and NMe2 groups (ΔΔG‡ ≈ 4 kcal/mol) at the 4-position of the pyridine group. For these PtII complexes with bipyridine (bpy) supporting ligands, the influence of modification of the bpy ligand is calculated to be minimal with ΔΔG‡ ≈ 0.4 kcal/mol for the oxy-insertion of bpy ligands substituted at the 4/4′ positions with NMe2 and NO2 groups. Overall, the predicted activation barriers for oxy-insertion (from the YO adducts [(Xbpy)Pt(R)(OY)]+) are large and in most cases are >40 kcal/mol, although some calculated ΔG‡'s are as low as 32 kcal/mol." @default.
- W2046352304 created "2016-06-24" @default.
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- W2046352304 date "2011-06-29" @default.
- W2046352304 modified "2023-10-11" @default.
- W2046352304 title "Non-redox Oxy-Insertion via Organometallic Baeyer–Villiger Transformations: A Computational Hammett Study of Platinum(II) Complexes" @default.
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- W2046352304 doi "https://doi.org/10.1021/om200258d" @default.
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