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The Eschweiler–Clarke (the amine methylation) reaction was investigated by density functional theory (DFT) calculations. First, a reaction model of H3CNH2 + HC(O)OH + CH2O + (H2O)3 → (H3C)2NH + CO2 + (H2O)4 was employed for geometry optimizations. Geometries and activation free energies of transition states (TSs) by eight DFTs, B2PLYP‐D3, B3LYP, B3LYP‐D, BP86‐D, PBE0‐D, M06‐2X, wB97X‐D, and APF‐D,...
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