2043-61-0Relevant articles and documents
Aerobic Oxidation of Alcohols to Carbonyl Compounds Catalyzed by N-Hydroxyphthalimide (NHPI) Combined with CoTPP-Zn2Al-LDH
Zhou, Weiyou,Chen, Dongwei,Cui, Aijun,Qian, Junfeng,He, Mingyang,Chen, Qun
, p. 295 - 299 (2017)
A catalytic system for the aerobic oxidation of alcohols by N-hydroxyphthalimide (NHPI) combined with cobalt porphyrin intercalated heterogeneous hybrid catalyst (CoTPP-Zn 2Al-LDH) has been developed. The results showed that this catalytic system can effectively catalyze the oxidation of alcohols to the corresponding carbonyl compounds. And the hybrid catalyst can be reused for five times with no appreciable reduction of activity. [Figure not available: see fulltext.]
Metallopeptoids as efficient biomimetic catalysts
Prathap, Kaniraj Jeya,Maayan, Galia
, p. 11096 - 11099 (2015)
Metallopeptoid catalysts incorporating phenanthroline-copper and TEMPO, and at least one non-catalytic group perform in the oxidation of various benzylic, allylic and aliphatic primary alcohols with a TON of up to 16 times higher than a mixture of the two catalytic groups or the peptoid dimer that is lacking the non-catalytic group.
Counterion effects in the preparation of aldehyde-bisulfite adducts
Kissane, Marie G.,Frank, Scott A.,Rener, Gregory A.,Ley, Christopher P.,Alt, Charles A.,Stroud, Paul A.,Vaid, Radhe K.,Boini, Sathish K.,McKee, Laura A.,Vicenzi, Jeffrey T.,Stephenson, Gregory A.
, p. 6587 - 6591 (2013)
The identification and development of an aldehyde-bisulfite adduct as an isolable starting material in the synthesis of the CETP inhibitor Evacetrapib are described. The physical properties of the sodium and potassium analogs are compared, and the extension of the scope of this study to include an investigation into the solid state properties of a range of sodium and potassium bisulfite adducts of commonly encountered aldehydes is discussed.
[{RhCl(CO)2}2]-Derived MCM-41-Tethered Rhodium Complex Catalysts via Phosphine, Amine and Thiol Ligands for Cyclohexene Hydroformylation
Huang, Lin,Kawi, Sibudjing
, p. 295 - 302 (2004)
Functionalized silicate MCM-41-tethered rhodium complexes derived from [{RhCl(CO)2}2] have been studied by infrared spectroscopy (IR), X-ray diffraction (XRD) and N2 adsorption-desorption. [{RhCl(CO)2}2] reacts with aminated MCM-41 to result in a splitting of the chloride bridge. The same result is presumed with phosphinated MCM-41. Thiolated MCM-41 is presumed to displace the chloride in the bridge with thiol ligands. The tethering of rhodium complexes to MCM-41 leads to reduced pore sizes, pore volumes and BET surface areas without altering the structural ordering of MCM-41. The MCM-41-tethered catalysts show distinct activities and resistance to rhodium leaching in cyclohexene hydroformylation under equimolar CO and H2 at 28 bar and 100 °C, depending on the nature of complexation of the supported donor ligands with the rhodium centre. The aminated MCM-41-tethered catalyst displays good activity, selectivity and recycling for the formation of cyclohexane carboxaldehyde. The mesoporous structure of MCM-41 remains stable during the reaction.
A new magnetic nanoparticle-supported Schiff base complex of manganese: An efficient and recyclable catalyst for selective oxidation of alcohols
Zhou, Qiangfei,Wan, Zijuan,Yuan, Xiaofeng,Luo, Jun
, p. 215 - 220 (2016)
A new magnetic nanoparticle-supported Schiff base complex of manganese was prepared via the copper-catalyzed 'click' reaction of an aminosalicylidene manganese complex bearing terminal alkynyl with azide-functionalized shell-core magnetic nanoparticles. T
PTFE-Membrane Flow Reactor for Aerobic Oxidation Reactions and Its Application to Alcohol Oxidation
Greene, Jodie F.,Preger, Yuliya,Stahl, Shannon S.,Root, Thatcher W.
, p. 858 - 864 (2015)
A "tube-in-shell" membrane flow reactor has been developed for aerobic oxidation reactions that permits continuous delivery of O2 to a liquid-phase reaction along the entire length of the flow path. The reactor uses inexpensive O2-permeable PTFE ("Teflon") tubing that is compatible with elevated pressures and temperatures and avoids hazardous mixtures of organic vapor and oxygen. Several polymeric materials were tested, and PTFE exhibits a useful combination of low cost, chemical stability and gas diffusion properties. Reactor performance is demonstrated in the aerobic oxidation of several alcohols with homogeneous Cu/TEMPO and Cu/ABNO catalysts (TEMPO = 2,2,6,6-tetramethyl-1-piperidinyl-N-oxyl and ABNO = 9-azabicyclo[3.3.1]nonane N-oxyl). Kinetic studies demonstrate regimes where the overall rate is controlled by the kinetics of the reaction or the transport of oxygen through the tube wall. Near-quantitative product yields are achieved with residence times as low as 1 min. A parallel, multitube reactor enables higher throughput, while retaining good performance. Finally, the reactor is demonstrated with a heterogeneous Ru(OH)x/Al2O3 catalyst packed in the tubing.
Mo2N nanobelts for dehydrogenation of aromatic alcohols
Li, Zhongcheng,Chen, Chunhui,Zhan, Ensheng,Ta, Na,Shen, Wenjie
, p. 58 - 62 (2014)
Mo2N nanobelts about 60 nm wide and 0.5-7.2 μm long have been synthesized by reacting a belt-shaped α-MoO3 precursor with ammonia at 850 °C. The Mo2N nanobelts effectively and selectively catalyzed dehydrogenation of a variety of aromatic alcohols. The coordinatively unsaturated Mo sites on the surface of the Mo2N nanobelts might be the active species.
Kinetics and Mechanism of Hydration of Alkylketenes
Allen, Annette D.,Tidwell, Thomas T.
, p. 2774 - 2780 (1987)
The hydration reactivities of CH2=C=O (1), t-Bu2C=C=O (5), Et2C=C=O (7), (CH2)4C=C=O (8), (CH2)5C=C=O (9), and t-BuCH=C=O (10) in H2O or H2O/CH3CN mixtures have been examined, including acid and base catalysis and solvent and structural isotope effects.These results provide the first systematic comparison of structural effects on the hydration of aliphatic ketenes, as well as the first measurements of base-induced hydration and pH-rate profiles for this process.The significant steric and electronic effects of the substituents observed lead to the interpretation that the acid-catalyzed reaction involves rate-limiting proton transfer to Cβ perpendicular to the ketene plane, while the H2O- and OH--induced reactions involve nucleophilic attack in the ketene plane.These results resolve the many conflicting previous reports and interpretations regarding ketene hydration.
HYDROFORMYLATION OF LESS REACTIVE OLEFINS WITH MODIFIED RHODIUM CATALYSTS
Leeuwen, P. W. N. M. van,Roobeek, C. F.
, p. 343 - 350 (1983)
The otherwise unreactive olefins (2-methyl-1-hexene, limonene, cyclohexene, methylene cyclohexane) are hydroformylated under mild conditions (90 deg C, 10 bar) in the presence of phosphite-modified rhodium catalysts.The high rates observed are attributed to the steric and electronic properties of these phosphite ligands and their ability to stabilize unsaturated rhodium species.Examples of these ligands are tris(o-t-butylphenyl) phosphite and tris(hexafluoroisopropyl) phosphite, which are, respectively, sterically demanding and strongly electron-withdrawing.
SPECIFIC AND SELECTIVE REDUCTION OF AROMATIC NITROGEN HETEROCYCLES WITH THE BIS-PYRIDINE COMPLEXES OF BIS(1,4-DIHYDRO-1-PYRIDYL)ZINC AND BIS(1,4-DIHYDRO-1-PYRIDYL)MAGNESIUM
Koning, A. J. De,Budzelaar, P. H. M.,Boersma, J.,Kerk, G. J. M. Van Der
, p. 153 - 170 (1980)
Aromatic nitrogen heterocycles, e.g. quinoline, 2,2'-bipyridyl and 1,10-phenanthroline, are reduced in a uniquely specific and selective way by the bis-pyridine complexes of bis(1,4-dihydro-1-pyridyl)zinc and bis(1,4-dihydro-1-pyridyl)magnesium.The reactions occur by hydrogen transfer from the metal-bound 1,4-dihydropyridyl moieties to the substrates and yield zinc or magnesium salts of the 1,4-dihydroazaaromatic derivatives.Upon hydrolysis, the 1,4-dihydroazaaromatic compounds are liberated from the metal ions.The isolation and purification of several of the (novel) reduced compounds, e.g. 1,4-dihydroquinoline and 1,4-dihydro-1,10-phenanthroline, are described.
