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Menshutkin reaction between DABCO and benzyfluoride/fluorodiphenylmethane: a mechanistic study

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Abstract

The microcosmic mechanism of the Menshutkin reaction between DABCO and benzyl fluoride/fluorodiphenylmethane has been investigated in both the gas and solvent phase by performing DFT calculations at B3LYP/6-31G(d,p) level of theory. The Gibbs free energy profiles to reach the possible transition states, i.e., five-membered ring transition state and SN2 transition state show that the reaction between DABCO and benzyl fluoride proceeds through SN2 transition state in accordance with previously reported studies, while the reaction between DABCO and fluorodiphenylmethane proceeds through five-membered ring transition state contrary to earlier literature. The role of solvent has been elucidated by reoptimizing the structures using SMD model of solvation. Hydrogen bonding and steric hinderance have been identified as the key factors in guiding the reaction pathway of commercially important Menshutkin reaction.

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Acknowledgments

A.P.S. thanks the Council of Scientific and Industrial Research, India (No. 09/135(0650)/2011-EMR-I) for the senior research fellowship.

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  1. Department of Chemistry, Panjab University, Chandigarh, India

    Amritpal Singh & Neetu Goel

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  1. Amritpal Singh
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  2. Neetu Goel
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Correspondence to Neetu Goel.

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Singh, A., Goel, N. Menshutkin reaction between DABCO and benzyfluoride/fluorodiphenylmethane: a mechanistic study. J Mol Model 20, 2265 (2014). https://doi.org/10.1007/s00894-014-2265-x

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  • DOI: https://doi.org/10.1007/s00894-014-2265-x

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