586-62-9Relevant articles and documents
Sustainable p-cymene and hydrogen from limonene
Martin-Luengo,Yates,Rojo, E. Saez,Huerta Arribas,Aguilar,Ruiz Hitzky
, p. 141 - 146 (2010)
A fine chemical intermediate in a wide range of chemical processes, p-cymene, has been obtained from Limonene, solids based on a natural clay (sepiolite) modified with sodium, nickel, iron or manganese oxides and programmable focalised microwaves. The process has the added bonus of one mol of hydrogen being produced per mol of limonene converted to p-cymene.
Aromatization of Hydrocarbons y Oxidative Dehydrogenation Catalyzed by the Mixed Addenda Heteropoly Acid H5PMo10V2O40
Neumann, Ronny,Lissel, Manfred
, p. 4607 - 4610 (1989)
The mixed addenda heteropoly acid H5PMo10V2O40 dissolved in 1,2-dichloroethane with tetraglyme, forming the (tetraglyme)3-H5PMo10V2O40 complex, catalyzes the aromatization of cyclic dienes at moderate temperatures in the presence of molecular oxygen.Dehydrogenations of exocyclic dienes such as limonene show that dehydrogenation is preceded by isomerization to their endocyclic isomers.Aromatization takes place by succesive one-electron transfers and proton abstractions from the organic substrate to the heteropoly acid, the latter being reoxidized by dioxygen coupled with the formation of water.
Preparation method of isopentylene
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Paragraph 0031-0050, (2021/11/10)
The method comprises the following steps: taking dipentene as a raw material, and using acetic acid in a high-pressure carbon dioxide environment. Isoterpinene is prepared by reacting acetate and an axial chiral nitrogen-containing compound as a catalyst. The axial chiral nitrogen-containing compound is one or more of an axial chiral nitrogen-containing binaphthyl or biphenyl compound. The selectivity and yield of terpinene are high.
Preparation of α-terpineol and perillyl alcohol using zeolites beta
?erveny, Libor,Vysko?ilová, Eli?ka,Zítová, Kate?ina
, p. 4297 - 4310 (2021/07/26)
The preparation of α-terpineol by direct hydration of limonene catalyzed by zeolites beta was studied. The same catalyst was used to prepare perillyl alcohol by isomerization of β-pinene oxide in the presence of water. The aim was to optimize the reaction conditions to achieve high conversions of starting material and high selectivity to the desired products. In the case of limonene, it was found that the highest selectivity to α-terpineol was 88% with conversion of 36% under the conditions: 50?wt% of catalyst beta 25, 10% aqueous acetic acid (10?mL) (volume ratio limonene:H2O = 1:4.5), temperature 50?°C, after 24?h. In the case of β-pinene oxide, it was found that the highest selectivity to perillyl alcohol, which was 36% at total conversion, was obtained in the reaction under the following conditions: dimethyl?sulfoxide as solvent (volume ratio β-pinene oxide:DMSO = 1:5), catalyst beta 25 without calcination (15?wt%), demineralized water (molar ratio β-pinene oxide:H2O = 1:8), temperature 70?°C, 3?h. The present study shows that the studied reactions are suitable for the selective preparation of chosen compounds.