3741-00-2Relevant academic research and scientific papers
Catalytic One-Pot Conversion of Renewable Platform Chemicals to Hydrocarbon and Ether Biofuels through Tandem Hf(OTf)4+Pd/C Catalysis
Liu, Dong-Huang,Marks, Tobin J.,Li, Zhi
, p. 5217 - 5223 (2019/11/03)
Efficient conversion of renewable biomass platform chemicals into high-quality fuels remains challenging. A one-pot catalytic approach has been developed to synthesize various structurally defined biofuels by using Hf(OTf)4 and Pd/C for selective tandem catalysis and 2-methylfuran (2-MF) as a renewable feedstock. 2-MF first undergoes Lewis acid-catalyzed hydroxyalkylation/alkylation (HAA) condensation with carbonyl compounds to afford intermediates containing the targeted carbon skeletons of hydrocarbon or ether products, and these intermediates then undergo hydrogenation or hydrodeoxygenation to afford the target products, catalyzed by metal triflate+Pd/C in the same pot. The present process can produce structurally defined alkanes and cyclic ethers under mild conditions.
Accessing Alkyl- and Alkenylcyclopentanes from Cr-Catalyzed Ethylene Oligomerization Using 2-Phosphinophosphinine Ligands
Newland, Robert J.,Smith, Alana,Smith, David M.,Fey, Natalie,Hanton, Martin J.,Mansell, Stephen M.
, p. 1062 - 1073 (2018/03/30)
Desilylation of the 2-phosphinophosphinine 2-PPh2-3-Me-6-SiMe3-PC5H2 with HCl gave 2-PPh2-3-Me-PC5H3, demonstrating the late-stage modification of this bidentate heterocyclic lig
Thiotolerant Ir/SiO2-Al2O3 bifunctional catalysts: Effect of metal-acid site balance on tetralin hydroconversion
Nassreddine, Salim,Massin, Laurence,Aouine, Mimoun,Geantet, Christophe,Piccolo, Laurent
scheme or table, p. 253 - 265 (2011/04/22)
The hydroconversion of tetralin over iridium nanoparticles supported on amorphous silica-alumina (ASA) has been investigated in a continuous high-pressure gas-phase micro-reactor in the presence of H2S. In order to tune the Ir particle size, the bifunctional Ir/ASA catalysts have been submitted to sintering treatments. The samples have been characterized by HRTEM and XPS. From careful analysis of tetralin conversion products by comprehensive two-dimensional gas chromatography (GC×GC-MS) and NMR, compound families have been unambiguously distinguished. Hydrogenation, dehydrogenation, (saturated and aromatic) ring-contraction products, and (saturated and aromatic) one-ring-opening products are formed, without significant cracking. The catalysts exhibit stable activity in the presence of sulfur. As the mean particle size increases from 1.5 to 8 nm, the ring-opening/contraction selectivity increases dramatically. This effect is related to an increase of the acid/metal site ratio.
Radical reactions in the radiolysis of cyclopentane
Wojnarovits,LaVerne
, p. 3168 - 3172 (2007/10/02)
The end products produced in the γ-radiolysis of cyclopentane have been measured at very low total doses (25-50 krad). Iodine scavenging techniques in solutions of 0.1-30 mM were used to elucidate radical yields and reaction mechanisms. The yields of the main radical species were found to be as follows: cyclopentyl, 4.9; 1-pentyl, 0.2; 3-cyclopentenyl, 0.07; H atom, 1.3 radical/100 eV. The change in yields from neat cyclopentane to 0.1 mM iodine solution suggests that about 79% of the cyclopentyl radicals escape the spur and react in the bulk medium with a disproportionation to combination ratio of 0.97. Radical precursors account for about 50% of the total end product yield, which is much smaller than found in the radiolysis of cyclohexane or cyclooctane. The radiolysis mechanism for cyclopentane is discussed and compared to those for cyclohexane and cyclooctane.
Unusual, CO Assisted Cyclo-oligomerization Reactions of Ethylene: Formation of Cyclopentane and Cyclohexane Derivatives by Ytterbium Ziegler-Natta Catalysts
Keim, Wilhelm,Chen, Zhongxin,Shen, Zhiquan
, p. 1923 - 1924 (2007/10/02)
A new oligomerization of ethene to alkylcyclopentanes and/or alkylcyclohexanes using YbCl3/AlEtCl2 or ZrCl4/AlEtCl2 Ziegler-Natta type catalysts is described in which addition of carbon monoxide is essential.
DIRECT PHOTOLYSIS AT 185 NM OF CYCLOPENTENE AND 2-NORBORNENE. A NOVEL REACTION CHANNEL FOR ?, ?* EXCITED SINGLET ALKENE
Inoue, Yoshihisa,Mukai, Toshio,Hakushi,Tadao
, p. 1045 - 1048 (2007/10/02)
Upon direct irradiation at 185 nm, the title compounds undergo hydrogen abstraction from the solvent via a ?, ?* excited singlet state as well as skeletal rearrangement via a ?,R(3s) Rydberg excited state.
