Abstract
A DFT study aimed at unravelling the origin of catalytic activity of iodine in reaction with alcohols is presented. Computed free energies for generation of the O–I complexes from the separated reactants are around 3 kcal/mol and solvation increases endoergicity by ca. 1 kcal/mol. Calculations suggest that halogen bond formation between I2 and alcohols does not lead to strong activation of the hydroxyl as a leaving group, although solvent has a notable effect in lowering endoergicity for carbocation formation. Model tertiary alcohols exhibited β-proton abstraction following breaking of the C–O bond, while model secondary and primary alcohols experienced an earlier β-proton abstraction, synchronic with the C–O bond cleavage. Consistent with computed natural bond orbital charges, benzylic and propargylic alcohols underwent iodide anion quenching at the para position of phenyl and C-3, respectively.
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Acknowledgements
We thank the University of Florida for access to computational facilities at UF High-Performance Computing Center. Access to computational resources at Mendieta cluster from CCAD-UNC, which is part of SNCAD-MinCyT, Argentina, is also acknowledged. GLB acknowledges funding from CONICET and Secyt-UNC. S. S. acknowledges the Slovenian Research Agency (Programme P1-0134) for financial support and helpful discussions with Dr. Anton Kokalj (Jožef Stefan Institute).
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Respectfully dedicated to Professor George Olah in memoriam.
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Borosky, G.L., Stavber, S. & Laali, K.K. Iodine Activation of Alcohols: A Computational Study. Top Catal 61, 636–642 (2018). https://doi.org/10.1007/s11244-018-0918-1
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DOI: https://doi.org/10.1007/s11244-018-0918-1