6070-00-4Relevant articles and documents
Study on selectivity of β-myrcene hydrogenation in high-pressure carbon dioxide catalysed by noble metal catalysts
Bogel-Lukasik,Gomes Da Silva,Nogueira,Bogel-Lukasik,Nunes Da Ponte
experimental part, p. 1847 - 1856 (2011/03/19)
Hydrogenation of monoterpenes, such as β-myrcene, in high-density carbon dioxide over 0.5 wt.% Pd, or Rh, or Ru supported on alumina was investigated. Hydrogenation catalysed by Rh and Ru is generally faster in a single supercritical (sc) phase (gaseous reagents and solid catalyst) than in a biphasic system (liquid + gas reactants + solid catalyst). The reaction catalysed by Pd occurs faster in two phases. The final composition of the reaction mixture is strongly dependent on the noble metal catalyst used for the reaction. Palladium gives mainly 2,6-dimethyloctane (≈95%), rhodium produces 2,6-dimethyloctane with a yield higher than 40%, and around 40% of 2,6-dimethyloct-2-ene, while ruthenium gives around 10% of 2,6-dimethyloctane and 50% of 2,6-dimethyloct-2-ene leaving the highest amount of unreacted β-myrcene. The Pd catalyst is highly active with an excellent selectivity in enabling the one-pot synthesis of 2,6-dimethyloctane through β-myrcene hydrogenation in the presence of scCO2. The overall activity of the noble metal catalysts decreased in the order Pd > Rh > Ru. The problem of leaching of the active metal from the catalyst rod was also investigated. The Royal Society of Chemistry 2009.
STABLE CARBOCATIONS FROM TERPENOIDS. IV. GENERATION OF STABLE IONS FROM SOME MONOTERPENES OF THE MENTAHNE AND CARANE SERIES
Popova, L. A.,Bardyshev, I. I.,Korchagina, D. V.,Dubovenko, Zh. V,Gatilov, Yu. V.,Barkhash, V. A.
, p. 709 - 720 (2007/10/02)
Stable carbocations were generated for the first time from momoterpenes of the menthane and carane-dipentene series, terpinolene, α and γ-terpinenes, isomeric p-menthenes, cis- and trans-caranes, and silvestrene.Their structures, reactions with nucleophiles, and certain rearrangements were studied.Differences were noted in the reactivity of the substrates in superacids and under conditions of acid catalysis
