27581-27-7Relevant academic research and scientific papers
Iridium-catalyzed hydrosilylative reduction of glucose to hexane(s)
McLaughlin, Matthew P.,Adduci, Laura L.,Becker, Jennifer J.,Gagné, Michel R.
supporting information, p. 1225 - 1227 (2013/03/28)
In light of diminishing petroleum feedstocks, there is significant interest in developing carbohydrate defunctionalization reactions. In this context we have examined the use of iridium pincer catalysts for the hydrosilylative reduction of sugars, and we report herein complete reduction of silyl-protected glucose to a mixture of hexane isomers.
Study of the isomerization of 13C labelled methylpentanes on oxygen modified bulk tungsten carbides
Keller,Garin,Maire
, p. 2893 - 2902 (2007/10/03)
The reactions of labelled 2- and 3-methylpentanes were carried out on three different oxygen modified bulk tungsten carbides varying by their oxygen treatment temperature. In all cases, isomerization took place via bond shift mechanisms; no cyclic mechanism was involved in contrast to metals like Pt, Pd or Ir where such mechanism occurs. Alkoxy and σ-alkyl intermediates were put forward as adsorbed species responsible for isomerization for bulk tungsten carbides treated by O2 at moderate temperature (350 °C) over a short period of time (5 min) and at high temperature (700 °C) for 4 h, respectively. These intermediate species are respectively correlated to an acidic and a metallic behavior of the catalytic surfaces. The increase of the O2 treatment time at 350 °C results in the presence of both kinds of these mechanisms for isomerization, a bifunctional behavior takes place where metallic and acidic characters are present. To explain the presence of terminal-13C on acidic catalysts, a 'protonated cyclopropane alkoxy species' intermediate responsible for isomerization was proposed. The driving force for the formation of such species being the presence of stable alkoxy species, general reaction pathways are discussed for the different kinds of catalysts.
