Conversion of Methanol to 2,2,3-Trimethylbutane (Triptane) over Indium(III) Iodide
Abstract
InI_3 is able to catalyze the conversion of methanol to a mixture of hydrocarbons at 200 °C with one highly branched alkane, 2,2,3-trimethylbutane (triptane), being obtained in high selectivity. The mechanism for InI_3-catalyzed reactions appears to be basically the same as that proposed for the previously studied ZnI_2-catalyzed system in which sequential methylation of olefins is followed by competing reactions of the resulting carbocation: proton loss to give the next olefin vs hydride transfer to give the corresponding alkane. Although the reaction conditions and typical triptane yields achievable with ZnI_2 and InI_3 are quite similar, the two systems behave rather differently in a number of important particulars, including significant differences between the detailed product distributions. Most of the differences in behavior can be ascribed to the stronger Lewis acidity of InI_3, including the ability to activate some alkanes, the higher activity for methylation of arenes, and the fact that methanol conversion can be observed at somewhat lower temperatures with InI_3 than with ZnI_2.
Additional Information
© 2007 American Chemical Society. Received July 20, 2007. Publication Date (Web): November 30, 2007. We thank Xingwei Li for useful discussions and Eugene Zaluzec for obtaining the PIANO analysis. This work was supported by BP through the MC2 program.Additional details
- Eprint ID
- 76716
- DOI
- 10.1021/ic7014447
- Resolver ID
- CaltechAUTHORS:20170419-150139603
- BP MC2 Program
- Created
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2017-04-19Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field