C-H activation on platinum, a mechanistic study

Carlito B. Lebrilla, Wilhelm F. Maier

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

C-H activation on heterogeneous Pt catalysts is found to be most facile at low Pt dispersion and surface structure insensitive at dispersions above 10%. Two distinct processes have been identified which lead to the formation of mono- and polydeuterated products, respectively. The ratio of mono-/polydeuteration processes increases with increasing disper ion. Evidence is provided for the formation of π-intermediates as the initiator of polydeuteration. The most facile mechanism of exchange propagation in a single molecule is through a π-allyl-type interconversion. The deuterium in monodeuterated n-hexane is located at the terminal position by high-resolution deuterium NMR. NMR spectroscopy also provides evidence for steric effects which prevent significant H/D exchange at positions close to quaternary centers. C-H activation appears to be sensitive to steric hindrance, the C-H bond energy, and the partial pressure of the substrate.

Original languageEnglish (US)
Pages (from-to)1606-1616
Number of pages11
JournalJournal of the American Chemical Society
Volume108
Issue number7
StatePublished - 1986

ASJC Scopus subject areas

  • Chemistry(all)

Fingerprint Dive into the research topics of 'C-H activation on platinum, a mechanistic study'. Together they form a unique fingerprint.

  • Cite this