Xi:Irritant;
1501-82-2Relevant academic research and scientific papers
Thermally stable homogeneous catalysts for alkane dehydrogenation
Haenel, Matthias W.,Oevers, Stephan,Angermund, Klaus,Kaska, William C.,Fan, Hua-Jun,Hall, Michael B.
, p. 3596 - 3600 (2001)
Thermostability is conditio sine qua non (a necessity) if organometallic compounds are used in the homogeneous catalysis of endothermic processes such as the dehydrogenation of alkanes to alkenes and hydrogen (see scheme). This thermostability and other requirements for such a catalyst are fulfilled by the anthraphos iridium(III)dihydride complex 1.
Studies on partial hydrogenation of 1,5,9-cyclo-dodecatriene towards cyclo-dodecene
Gaube,David,Sanchayan,Wuchter,Klein
, p. 21 - 27 (2011)
The selective hydrogenation of 1,5,9-cis,trans,trans-cyclo-dodecatriene (1,5,9-ctt-CDT) towards cyclo-dodecene (CDE) depends strongly on the pressure of hydrogen, respectively the hydrogenation rate. High yields of CDE (>90%) can only be reached at extremely low hydrogen pressure. In order to elucidate this exceptional reaction performance the course of reaction has been studied for a wide range of hydrogen pressure, 0.01>pH2>2.5MPa, taking into consideration data of other research groups. The CDT hydrogenations were discontinuously carried out in liquid phase on Pd/Al2O3 at T = 353 K. The resulting hypothesis of this study is that the very low reaction rate at low pH2 is necessary in order to realize a dense surface coverage of 1,5,9-CDT and 1,5-cyclo-dodecadiene (CDD) isomers where these molecules show adsorption on Pd via two double bonds so that readsorption of formed CDE and subsequent hydrogenation to cyclo-dodecane (CDA) is hardly possible. On the whole this new hypothesis on the reaction course of CDT hydrogenation gives a sound and fully consistent view on this rather complicated reaction.
Direct and Unified Access to Carbon Radicals from Aliphatic Alcohols by Cost-Efficient Titanium-Mediated Homolytic C?OH Bond Cleavage
Suga, Takuya,Takahashi, Yuuki,Miki, Chinatsu,Ukaji, Yutaka
, (2022/01/31)
Low-valent Ti-mediated homolytic C?O bond cleavage offers unified access to carbon radicals from ubiquitous non-activated tertiary, secondary, and even primary alcohols. In contrast to the representative Ti reagents, which were ineffective for this purpos
Method for Preparing Cyclododecene and Synthesis Device Therefor
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Paragraph 0082-0119, (2021/03/13)
A method for preparing cyclododecene and a synthesis device therefor, of the present invention, remarkably increase the conversion ratio of cyclododecatriene and selectivity of cyclododecene, can minimize the costs required for equipment and processing, are practical, reduce processing time, and are industrially advantageous to mass production in comparison with a conventional method and device.
Hydrogenation of 1,5,9-Cyclododecatriene in a Three-Phase System in the Presence of Nickel Nanoparticles Supported on NаX Zeolite
Nebykov,Popov, Yu. V.,Mokhov,Shcherbakova,Zotov, Yu. L.
, p. 110 - 115 (2021/03/18)
The hydrogenation of 1,5,9-cyclododecatriene in the presence of nanostructured Ni catalysts, supported with NaX zeolite, in a flow-through reactor at atmospheric hydrogen pressure was investigated. Nickel nanoparticles on the support surface were prepared by chemical reduction of the precursor (NiCl2) with NaBH4 and NH2NH2. The effect exerted on the yield of hydrogenation products by the nominal residence time of the gas phase in the reaction zone and by the process temperature was considered, and the catalyst operation life was analyzed. The catalysts showed high activity and allowed preparation of cyclododecane in ~100% yield at a process temperature of up to 160°С.
METHOD FOR MANUFACTURING CYCLODODECANONE AND APPARATUS FOR MANUFACTURING THE SAME
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Paragraph 0082-0083, (2020/05/14)
A method for manufacturing cyclododecanone according to the present invention has an effect of having a significantly high conversion rate of cyclododecene and selectivity of cyclododecanone, can minimize the cost used for equipment and processes, is practical, and has an advantageous effect on industrial mass production compared to the prior art by significantly reducing a reaction residence time and a required reaction volume of a reactor.COPYRIGHT KIPO 2019
Process for producing laurolactam and its synthesis apparatus
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Paragraph 0082-0084, (2020/05/14)
A method for manufacturing laurolactam and a synthesis apparatus thereof according to the present invention have a remarkably high conversion rate of raw materials and selectivity of a target compound, have an effect of synthesizing the target compound with a high yield and high purity, can minimize costs used for equipment and processes, are practical, and have an advantage of being more simplified compared to the prior art.COPYRIGHT KIPO 2019
Colloid and Nanosized Catalysts in Organic Synthesis: XIX.1 Influence of the Support Nature on Hydrogenation Catalysis of Cyclic Olefins by Nickel Nanoparticles
Popov, Yu. V.,Mokhov,Nebykov,Shcherbakova,Dontsova
, p. 20 - 24 (2018/03/09)
Gas-phase hydrogenation of cycloalkenes in the presence of nickel nanoparticles supported on Ceokar-2, BAU-A activated carbon, alumina, and NaX zeolite proceeds at 140–240°C and atmospheric pressure of hydrogen. The conversion and selectivity depend on the type of support and on the hydrogen excess.
Colloidal and nanosized catalysts in organic synthesis: XV. Gas-phase hydrogenation of alkenes catalyzed by supported nickel nanoparticles
Popov, Yu. V.,Mokhov,Nebykov,Latyshova,Panov,Dontsova,Shirkhanyan,Shcherbakova
, p. 2589 - 2593 (2017/03/22)
Gas-phase hydrogenation of alkenes and their derivatives, catalyzed by nickel nanoparticles supported on zeolite or silica gel support occurs at 150–250°С and an atmospheric hydrogen pressure and results in a high conversion. The selectivity of the hydrogenation depends on the amount of hydrogen: at a low diene (triene)–hydrogen ratio, selective hydrogenation of one multiple bond in the substrate is possible.
A long-tethered (P-B-P)-pincer ligand: Synthesis, complexation, and application to catalytic dehydrogenation of alkanes
Kwan, Enrique Huang,Kawai, Yasushi Jack,Kamakura, Sei,Yamashita, Makoto
, p. 15931 - 15941 (2016/10/22)
A new long-tethered boron-containing (P-B-P)-pincer ligand 8 has been synthesized. Complexation of 8 with [Ir(coe)2Cl]2 (coe = cyclooctene) resulted in (P-B-P)(hydrido)chloroiridium complex (P-B-P)Ir(H)Cl 9. Subsequent reaction with nBuLi led to the formation of dihydride complex (P-B-P)Ir(H)210. Both complexes were found to be moderately active for the catalytic dehydrogenation of alkanes.
