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Mechanism and reactivity in the Morita–Baylis–Hillman reaction: the challenge of accurate computations

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Abstract

A systematic density functional theory exploration of various reactive steps together with benchmark coupled cluster results are used to propose an accurate model of the mechanism of the Morita–Baylis–Hillman (MBH) reaction in organic chemistry. This reaction has attracted considerable interest from the synthetic and mechanistic points of view in recent years, with both computational and experimental mechanistic studies. It has recently (R. E. Plata and D. A. Singleton, J. Am. Chem. Soc., 2015, 137, 3811–3826) been correctly pointed out that previous computational studies failed to reproduce known mechanistic features of the reaction. The same study argued that computation is simply not able at the present time to provide accurate models for such reactions. This second claim is shown by our present work to overstate the problem: by using current ‘state of the art’ methodology, our results are fully consistent with observed behavior within the expected error bars of 1–5 kcal mol−1, far smaller than the errors reported in Plata and Singleton's study. On the basis of exhaustive calculations reported here, we suggest that our proposed approaches for modeling electronic structure, solvation, and entropy should be able to provide accurate predictions for many more reactions. We also suggest that reactions like the MBH reaction, where solvation and entropy effects are particularly large, are among the hardest for computational mechanistic studies.

Graphical abstract: Mechanism and reactivity in the Morita–Baylis–Hillman reaction: the challenge of accurate computations

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Publication details

The article was received on 22 Sep 2017, accepted on 24 Oct 2017 and first published on 24 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP06508F
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Mechanism and reactivity in the Morita–Baylis–Hillman reaction: the challenge of accurate computations

    Z. Liu, C. Patel, J. N. Harvey and R. B. Sunoj, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP06508F

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