Dehydrohalogenation of ethyl halides |
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| Authors: | Nwakamma Ahubelem Mohammednoor Altarawneh Bogdan Z Dlugogorski |
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| Institution: | 1. School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia;2. School of Engineering and Information Technology, Murdoch University, Murdoch, WA 6150, Australia |
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| Abstract: | Unimolecular decomposition kinetics of selected ethyl halides, phenethyl halides and methoxyphenethyl halides have been investigated using high level computational chemistry methods. The phenethyl halides decompose faster than the ethyl halides due to a more electronegative chlorine atom, induced by the chloroethyl functionality as an electron-withdrawing group. 1-Chloro-2-(methylthio)ethane exhibits faster dehydrochlorination than that of chloroethane/1-chloro-2-methoxyethane, owing to more polarisable C?H and C?Cl bonds in the transition structures. Calculations suggest that electronic factors rather than anchimeric assistance influence the dehydrochlorination reactions. |
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| Keywords: | Dehydrohalogenation Anchimeric assistance Activation enthalpy Arrhenius parameters |
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