565-00-4Relevant articles and documents
Christensen,Gilbert,Bocek
, p. 2331 (1938)
ZrO2-SiO2 mixed oxides xerogel and aerogel as solid acid catalysts for solvent free isomerization of α-pinene and dehydration of 4-methyl-2-pentanol
Sidhpuria, Kalpesh B.,Tyagi, Beena,Jasra, Raksh V.
experimental part, p. 1164 - 1170 (2012/06/30)
Sulfated and non-sulfated ZrO2-SiO2 mixed oxide xerogel and aerogel samples having varied Zr/Si molar ratio were evaluated as solid acid catalysts for the isomerization of α-pinene and dehydration of 4-methyl-2-pentanol. Sulfation resulted into enhancement in the catalytic activity of both xerogel and aerogel samples towards the studied reactions. For example, sulfated catalysts showed 86-98% conversion of α-pinene and 8-35% conversion of 4-methyl-2-pentanol. The selectivity data for camphene and limonene indicated the requirement of moderate acidity. The correlation with cyclohexanol dehydration showed that isomerization of α-pinene is a Bronsted acid catalyzed reaction. The relationship of 4-methyl-2-pentanol conversion with acid site density and sulfur per unit area was found to be linear.
Liquid Crystalline Catalysis, 3, Monomolecular Rearrangements of Terpene Derivatives in Liquid Crystalline Solvents
Melone, S.,Mosini, V.,Nicoletti, R.,Samori, B.,Torquati, G.
, p. 399 - 410 (2007/10/02)
The ability of limonene and linalool to rearrange in mesomorphic media is apparently determined by the constraints exerted by the solvent structure on the translational diffusions of the reactant solute molecules.Selective conversions seem to be promoted by the different media.Alkylcyclohexyl- and alkylbicyclohexyl-carboxylic acids and their mixtures with toluic acid have been used as solvents.The B structure of their smectic phases has been demonstrated by X-ray diffraction studies.
Effect of Sulfate Ions on Activity of TiO2, Fe2O3 and ZrO2 for the 2-Pinene Isomerization Reaction
Ohnishi, Ryuichiro,Morikawa, Toshiyuki,Hiraga, Yoshizumi,Tanabe, Kozo
, p. 205 - 210 (2007/10/02)
Treatment of titanium oxide, Fe2O3 and ZrO2 with (NH4)2SO4 brought high catalytic activity for isomerization of 2-pinene.The selectivities of the catalysts for formation of camphene and 1,7,7-trimethyltricyclo2.6>heptane(tricyclene) were high (60-70 percent).The effect of sulfate ions has been interpreted in terms of surface acid strenght.Key words: Oxides / Sulphate ion / Isomerization / 2-Pinene