104-93-8Relevant articles and documents
Hydrogenation of aromatic aldehydes to aromatic hydrocarbons over Cu-HZSM-5 catalyst
Kong, Xiangjin,Chen, Ligong
, p. 45 - 49 (2014)
With benzaldehyde as a model compound, the hydrogenation of aromatic aldehydes to aromatic hydrocarbons was investigated. Cu-HZSM-5 exhibited excellent catalytic performance for the reaction. The obtained catalysts were characterized by N2 adsorption/desorption, N2O chemisorptions, X-ray diffraction, NH3-temperature programmed desorption and X-ray photoelectron spectroscopy. It was found that Cu 0 active species exhibited poor activity for the hydrogenation of benzene ring, while the strong acidity of HZSM-5 accelerated the hydrogenation reaction via hydrogen spillover phenomenon and the C-O activation effect. In addition, the catalyst was proved to be effective for the hydrogenation of a series of aromatic aldehydes to corresponding aromatic hydrocarbons.
Electrocatalytic degradation of aspen lignin over Pb/PbO2 electrode in alkali solution
Wang, Yong-sheng,Yang, Fang,Liu, Zhi-hua,Yuan, Lu,Li, Gang
, p. 49 - 53 (2015)
Abstract A novel procedure about electrochemical catalysis degradation of aspen lignin with Pb/PbO2 anode in the three-dimensional electrode (TDE) reactor was investigated. SEM, XRD and cyclic voltammogram tests were employed to study the surface morphology, composition and the electrochemical redox performance of the fabricated Pb/PbO2 electrode. The lignin was cracked by OH and hydrogenated by [H] atom generated from alkaline water electrolysis, leading to the production of 4-methylanisole and other products. Raw material lignin concentration, current density, temperature and time were optimized. The pathway of electrocatalytic degradation and hydrogenation process of lignin in alkaline solution was also discussed.
Pd(0)-CATALYZED ELECTRO-REDUCTIVE COUPLING OF ARYL HALIDES
Torii, Sigeru,Tanaka, Hideo,Morisaki, Kazuo
, p. 1655 - 1658 (1985)
An efficient electro-reductive coupling of aryl bromides and iodides into biaryls has been performed by the electrolysis with Pd(0)- and/or Pd(II)-catalysts in a DMF-Et4NOTs-(Pb cathode) system. 4-Bromo- and 2-bromopyridines were also converted into the corresponding bipyridyls, respectively.
Iodothyronine Deiodinase Mimics. Deiodination of o,o'-Diiodophenols by Selenium and Tellurium Reagents
Vasil'ev, Andrei A.,Engman, Lars
, p. 3911 - 3917 (1998)
To better understand, and in the extension mimic, the action of the three selenium-containing iodothyronine deiodinases, o,o'-diiodophenols were reacted under acidic conditions with sodium hydrogen telluride, benzenetellurol, sodium hydrogen selenide, or benzeneselenol and under basic conditions with the corresponding deprotonated reagents. Sodium hydrogen telluride was found to selectively remove one iodine from a variety of 4-substituted o,o'-diiodophenols, including a protected form of thyroxine (T4). Thus, it mimics the D1 variety of the iodothyronine deiodinases. Sodium telluride was a more reactive deiodinating agent toward o,o'-diiodophenols, often causing removal of both halogens. Benzenetellurol and sodium benzenetellurolate sometimes showed useful selectivity for monodeiodination. However, the products were often contaminated by small amounts of organotellurium compounds. Sodium hydrogen selenide, sodium selenide, benzeneselenol, and sodium benzeneselenolate were essentially unreactive toward o,o'-diiodophenols. To gain more insight into thyroxine inner-ring deiodination, substituted 2,6-diiodophenyl methyl ethers were treated with some of the chalcogen reagents. Reactivity and selectivity for monodeiodination varied considerably depending on the substituents attached to the aromatic nucleus. In general, it was possible to find reagents that could bring about the selective mono- or dideiodination of these substrates.
Reaction of borane-dimethyl sulfide complex with aromatic acids: Access to methyl compounds or to benzyl dimethyl sulphonium salts
Le Deit,Cron,Le Corre
, p. 2759 - 2762 (1991)
In certain conditions, the action of borane dimethyl sulfide (BMS) with aromatic carboxylic acids leads to the corresponding methyl derivatives or, in the presence of BF3, to the benzyl dimethyl sulphonium salts.
Encapsulated Ni-Co alloy nanoparticles as efficient catalyst for hydrodeoxygenation of biomass derivatives in water
Chen, Chun,Gong, Wanbing,Han, Miaomiao,Wang, Dongdong,Wang, Guozhong,Zhang, Haimin,Zhang, Jifang,Zhang, Yunxia,Zhao, Huijun
, p. 2027 - 2037 (2021)
Catalytic hydrodeoxygenation (HDO) is one of the most promising strategies to transform oxygen-rich biomass derivatives into high value-added chemicals and fuels, but highly challenging due to the lack of highly efficient nonprecious metal catalysts. Herein, we report for the first time of a facile synthetic approach to controllably fabricate well-defined Ni-Co alloy NPs confined on the tip of N-CNTs as HDO catalyst. The resultant Ni-Co alloy catalyst possesses outstanding HDO performance towards biomass-derived vanillin into 2-methoxy-4-methylphenol in water with 100% conversion efficiency and selectivity under mild reaction conditions, surpassing the reported high performance nonprecious HDO catalysts. Impressively, our experimental results also unveil that the Ni-Co alloy catalyst can be generically applied to catalyze HDO of vanillin derivatives and other aromatic aldehydes in water with 100% conversion efficiency and over 90% selectivity. Importantly, our DFT calculations and experimental results confirm that the achieved outstanding HDO catalytic performance is due to the greatly promoted selective adsorption and activation of C=O, and desorption of the activated hydrogen species by the synergism of the alloyed Ni-Co NPs. The findings of this work affords a new strategy to design and develop efficient transition metal-based catalysts for HDO reactions in water.
Co embedded within biomass-derived mesoporous N-doped carbon as an acid-resistant and chemoselective catalyst for transfer hydrodeoxygenation of biomass with formic acid
Yang, Huanhuan,Nie, Renfeng,Xia, Wang,Yu, Xiaolong,Jin, Dingfeng,Lu, Xinhuan,Zhou, Dan,Xia, Qinghua
, p. 5714 - 5722 (2017)
An N-doped Co@C catalyst (Co@NC) is synthesized by a one-pot carbonization of biomass-derived glucose and harmless melamine with CoCl2 as the catalyst, where C and N resources could be transformed into highly graphitic N-doped carbon, while the coordinated Co2+ ions are reduced to uniform Co nanoparticles (NPs), which are embedded in N-doped graphitic structures. Under base-free conditions with formic acid (FA) as a hydrogen donor, the optimized Co@NC-700 (pyrolyzed at 700 °C) shows a highly efficient H2 generation from FA and the best activity for vanillin hydrodeoxygenation (HDO) with FA. For example, Co@NC-700 exhibits 15.4 times higher activity in comparison with uncovered Co on AC (Co/AC), and affords >95% vanillin conversion with 2-methoxy-4-methylphenol (MMP) as the sole product at 180 °C for 4 h. Compared with molecular hydrogen, Co@NC-700 gives a much higher activity and MMP selectivity for vanillin HDO with FA. The Co@NC-700 demonstrates enhanced acid resistance in acidic medium and adsorption of vanillin, and is recyclable and versatile for hydrogenating various unsaturated compounds. The superior performance of Co@NC-700 could be ascribed to N-derived defective sites on Co@NC, which could play multiple roles as base additives in FA dehydrogenation and as a metal-like active center in vanillin HDO.
DESULFURIZATION OF MERCAPTANS TO HYDROCARBONS BY CARBON MONOXIDE AND WATER IN THE PRESENCE OF COBALT CARBONYL
Shim, Sang Chul,Antebi, Shlomo,Alper, Howard
, p. 1935 - 1938 (1985)
Benzylic mercaptans and thiophenols undergo desulfurization when exposed to carbon monoxide and water, with cobalt carbonyl as the catalyst; carbonyl sulfide is evolved in these reactions.
Syntheses, binding properties, and structures of seven new hemicarcerands each composed of two bowls bridged by three tetramethylenedioxy groups and a fourth unique linkage
Yoon, Juyoung,Sheu, Chimin,Houk,Knobler, Carolyn B.,Cram, Donald J.
, p. 9323 - 9339 (1996)
Treatment of 2 mol of the bowl-shaped tetrol 1 (derived originally from resorcinol and dihydrocinnamaldehyde) with 3 mol of TsO(CH2)4OTs gave diol 2. Eight compounds with different combinations of bridges were formed from 2 by treatment with Cs2CO3 and the following reagents in the presence of potential guests to give either free or complexed hemicarcerands as follows: ClCH2Br gave 4; TsO(CH2)2OTs gave 5; TsO(CH2)3OTs gave 6; MsO(CH2)4OMs gave 7, a known system; MsO(CH2)5OMs gave 8; 2,3-bis(bromomethyl)quinoxaline gave 9; 1,3-(ClCH2)2C6H4 gave 10; 2,6-bis(chloromethyl)pyridine gave 11. Thirty-six fully characterized new hemicarceplexes are reported which were prepared either directly from diol 2 by the "sealing in" of the guest during introduction of the fourth bridge, or by guest exchange driven by mass law at 25 to 160 °C. The guests ranged in size from CHCl3 to 1,2,3-(MeO)3C6H3. The incarcerated guests correlated with portal sizes of their hosts. Crystal structures of 8⊙4-MeC6H4OMe and 10⊙CHCl3 were determined. Changes in chemical shifts in 1H NMR spectra of incarcerated and free guests are interpreted in terms of their locations in the hosts' inner phases. The length and nature of the unique host bridge affects the chemical shifts of the other bridges. Force field calculations of structural models for N-methylpyrrolidinone incarcerated in 4-7 were made. Approximate half-lives for decomplexation were determined for complexes involving the larger hosts and guests. Force-field calculations were made of binding energies and activation energies for decomplexations of models of 7⊙N-methylpyrrolidinone, 80⊙N-methylpyrrolidinone, and 10⊙N-methylpyrrolidinone. The activation energies for decomplexation were dissected into intrinsic and constrictive components.
Bromine-induced Photochemical Protodesilylation of Benzyltrimethylsilanes by Hydrogen Bromide
Baciocchi, Enrico,Crescenzi, Manuela,Giacco, Tiziana Del
, p. 3377 - 3378 (1991)
Benzyltrimethylsilanes are efficiently converted into toluenes by a Br2-induced photochemical chain process in the presence of HBr.
