MP2/6-31G**//MP2/6-31G**, PMP2/6-31G**//MP2/6-31G**, MP4/6-311G(3df,2p)//MP2/6-31G**, PMP4/6-311G(3df,2p)//MP2/6-31G** and CCSD(T)/6-311++G**//MP2/6-31G** calculations have been used to investigate the H-abstraction reaction from CH3OCH3
(DME) whereas MP2/6-31G**//MP2/6-31G** and PMP2/6-31G**//MP2/6-31G** levels have been used to model the H-abstraction reaction from (CH3)3COCH3
(MTBE) by ˙OH. The methodology used has been proved to be adequate to reproduce the experimental geometrical parameters for the reactants and the C–H bond energies. The reaction rate constants for DME, calculated using the transition state theory reproduce the reported
experimental results. The fact that H-abstraction is favored from the methoxy group of MTBE in comparison to the tert-butyl group has also been reproduced.
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