508-32-7Relevant academic research and scientific papers
Disparate Reactivity of 4-Tricyclic Iodide and Chloride in the SRN1 Reaction; Bridgehead revisited
Santiago, Ana N.,Morris, David G.,Rossi, Roberto A.
, p. 220 - 221 (1988)
The remarkably facile SRN1 reaction of 4-tricyclil iodide and the near inertia of 4-tricyclyl chloride under the same conditions are compared with the reactivity of other bridgehead compounds; the nature of the SRN1 reaction for aliphatic substrates is discussed.
Oxidation of α-pinene by atmospheric oxygen in the supercritical CO2-ethyl acetate system in the presence of Co(II) complexes
Anikeev,Ilina,Kurbakova,Nefedov,Volcho,Salakhutdinov
experimental part, p. 190 - 195 (2012/03/12)
The reactivity of monoterpene α-pinene in a flow reactor in the presence of cobalt catalyst in a complex supercritical solvent consisting of CO2 and ethyl acetate is studied over the temperature range of 190-320°C and a pressure range of 110-125 atm. It was found that the main isomerization products include compounds with bicyclo[2.2.1]heptane and p-menthane backbones; the reaction is accompanied by partial racemization. The formation of oxidation products is observed in the presence of air, with epoxydation rather than allylic oxidation being the predominant process at the first stage. The oxidized products (campholenic aldehyde, verbenone, pinocamphone) are shown to be formed with a high enantioselectivity; the formation of acetoxylation products is observed at temperatures above 200°C.
Selective vapour-phase α-pinene isomerization to camphene over gold-on-alumina catalyst
Simakova,Solkina, Yu.S.,Moroz,Simakova,Reshetnikov,Prosvirin,Bukhtiyarov,Parmon,Murzin, D.Yu.
experimental part, p. 136 - 143 (2010/11/18)
The vapour-phase isomerization of α-pinene for the first time was studied over a supported Au catalyst. α-pinene was isomerized to camphene over the 2.2% Au/γ-Al2O3 catalyst at 463-483 K using a solution of the reagent in n-octane as the initial reaction mixture and H2 or N2 as a carrier gas. Under these conditions, the selectivity to camphene reaches 60-80% at 99.9% conversion of α-pinene. The reaction is found to be first-order with respect to α-pinene, the apparent activation energy being similar to that observed with the conventional TiO2 catalyst. The prominent catalyst deactivation has been observed at increased α-pinene concentrations in the inlet reaction mixture (≥4 vol% in n-octane solution). According to HRTEM and TPO results, the deactivated catalyst contains the carbonaceous deposits that may block the catalyst surface. Almost complete regeneration was done in flowing O2 at temperature up to 923 K required to totally eliminate the coke deposits.
Thermal transformation of monoterpenes within thionin-supported zeolite Na-Y. Acid-catalyzed or electron transfer-induced?
Stratakis, Manolis,Stavroulakis, Manolis,Sofikiti, Nikoletta
, p. 16 - 20 (2007/10/03)
Several monoterpenes (monocyclic, bicyclic or acyclic) isomerize and finally transform to p-cymene in the dark upon loading within thionin-supported zeolite Na-Y. The same reactions occur in Na-Y dried under the same conditions as thionin/Na-Y. It is postulated that the thermal treatment of Na-Y generates 'electron holes' (probably acidic sites). The transformation of monoterpenes occurs more likely via an electron transfer-induced reaction subordinated to the occurrence of the acidic sites. The radical cation of the more thermodynamically stable monoterpene, α-terpinene, eventually dehydrogenates to p-cymene. For comparison, the same reactions were performed within methyl viologen-supported Na-Y. Copyright
Dehydration of Alcohols Catalysed by Heteropolyacids Supported on Silica
Alesso, Elba,Torviso, Rosario,Finkielsztein, Liliana,Lantano, Beatriz,Moltrasio, Graciela,Aguirre, Jose,Vazquez, Patricia,Pizzio, Luis,Caceres, Carmen,Blanco, Mirta,Thomas, Horacio
, p. 1232 - 1245 (2007/10/03)
Keggin type heteropolyacids supported on silica efficiently dehydrate secondary and tertiary alcohols under mild conditions and in good yields to afford the correspondent alkenes.
Process for the production of 1,4,7,10-tetraazacyclododecane and its derivatives
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, (2008/06/13)
A process for the production of 1,4,7,10-tetraazacyclododecane (cyclene) and its derivatives on an industrial scale comprises cyclotetramerizing of benzylaziridine that is produced in situ.
Liquid-phase isomerization of α-pinene on a natural clinoptilolite
Allakhverdiev,Sokolova,Gunduz,Kul'kova
, p. 1647 - 1650 (2007/10/03)
The liquid-phase isomerization of α-pinene on a suspended powder (50-100 μm) of a natural clinoptilolite is studied. It is found that thermoevacuation at 500°C decreases the catalyst's activity and selectivity. The surface acidity decreases, whereas the surface concentration of Fe2+ ions increases. The reaction mechanism is proposed.
Reaction of Hydrazones with Methoxy(tosyloxy)iodobenzene (MTIB): Tosylate Formation under Oxidative Conditions
Ramsden, Christopher A.,Rose, Helen L.
, p. 27 - 28 (2007/10/03)
Treatment of aromatic hydrazones 1 containing electron-withdrawing, reduction sensitive substituents with MTIB gives the corresponding tosylates 2 in high yield. When the tosylate is particularly reactive the thermodynamically more stable methyl ether 3 is isolated. Analogous reactions with DAIB give acetates 4 in high yield. Dialkyl hydrazones give olefinic products (e.g. 7 and 8). (+)-Camphor hydrazone 1k with either MTIB or DAIB gives both camphene 12 (major product) and tricyclene 11 (minor product) suggesting that a carbene pathway accounts for some of the material formed in these oxidations.
Catalytic Transformation of camphene over Aluminophosphate-based Molecular Sieves
Elangovan, S. P.,Arabindoo, Banumathi,Krishnasamy, V.,Murugesan, V.
, p. 4471 - 4476 (2007/10/03)
The catalytic transformation of camphene over AlPO4-11, SAPO-5, SAPO-11, VAPO-5, VAPO-11, CoAPO-5, CoAPO-11, NAPO-5, NAPO-11, ZAPO-5 and ZAPO-11 in the vapour phase has been studied.The products formed are tricyclene, bornylene and monocyclic terpenes.The
Synthesis, Characterization, and Catalytic Activity of NAPO-5 and NAPO-11
Elangovan, Shanmugam P.,Krishnasamy, Vengaimuthu,Murugesan, Velayutham
, p. 3659 - 3664 (2007/10/03)
Nickel-substituted aluminophosphate molecular sieves (NAPO-5 and NAPO-11) were synthesized hydrothermally using triethylamine and dipropylamine as templates.Structures were confirmed by X-ray powder pattern, and unit cell parameters calculated by a standard least square refinement technique.The isomorphous substitution of nickel in the aluminophosphate framework is evidenced by the considerable increase in unit cell volume compared to unsubstituted AlPO4-5 and AlPO4-11.In addition, electron spin resonance and diffuse reflectance spectra were carried out to produce supporting evidence for the isomorphous substitution of nickel.Acidity was determined by TPD-TGA method which shows two types of acid sites.Symmetry and asymmetry vibrations were obtained from infrared spectra.Chemical analysis by ICP and BET surface area are also reportedd.The physicochemical properties of the catalysts were correlated towards isomerization of camphene at various (WHSV)-1 values and temperatures.The products formed are tricyclene and 2-bornene and the selective formation of tricyclene was achieved over, these catalysts.
