A mechanistic explanation for selectivity in the conversion of methanol to 2,2,3-trimethylbutane (triptane): Moderate acidity allows kinetic control to operate

作者：Hazari Nilay; Labinger Jay A^*; Scott Valerie J

来源：Journal of Catalysis, 2009, 263(2): 266-276.

DOI：10.1016/j.jcat.2009.02.018

• Methanol conversion
• Carbocationic mechanism
• Zinc iodide
• Indium iodide
• Branched hydrocarbons

Methanol is converted to hydrocarbons by reaction with Znl(2) or Inl(3) at 200 degrees C, with surprisingly high selectivity (yields on the order of 20%) to a single highly branched alkane, 2,2,3-trimethylbutane (triptane). Mechanistic studies demonstrate that the previously proposed mechanism, which proceeds via a carbocation-based route that involves methylation of olefins and hydride transfer to carbocations. can account quantitatively for the selectivity. Differences in product distribution between the Zn- and In-based systems represent quantitative, not qualitative, differences in behavior, and can be attributed to the slightly higher effective acidity of the latter.

• 出版日期2009-4-25