The transformations of methyloxirane and cis- and trans-2,3-dimethyloxirane have been studied on Pt/C and Pd/C catalysts at 373 K in the hydrogen pressure range 2-70 kPa in a circulation reactor. The reactions of the dimethyloxirane isomers proceed by similar mechanisms, the rate-determining step in both cases presumably being cleavage of the C-O bond. The mechanism for methyloxirane differs from that for the dimethyloxiranes. One mechanism involves edgewise adsorption of the oxirane (probably via two non-bonding electron pairs), while the other involves flat-lying adsorption. The change in regioselectivity with increase in hydrogen pressure is caused by supression of the adsorption of oxygen via two electron pairs.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases|
|Publication status||Published - Dec 1 1987|
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