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采用共沉淀法制备了Ni(OH)2催化剂,该催化剂对温和条件下以分子氧为氧化剂的苯甲醇及烯丙醇类的氧化反应有十分理想的催化效果,并且完全可以通过简单的处理回收利用. 相似文献
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Labile iron(II) and iron(III) complexes {[FeII(bpy)22+]solv and [FeIII(bpy)23+]solv} in acetonitrile activate dioxygen for the oxidation of limonene to produce mainly carvone, carveol, limonene oxide, and
perillaldehyde. Iron(III) complex is reduced by the substrate to iron(II) one, which activates dioxygen. Probably the catalyst
interacts with substrate prior to the oxidation process. Perillaldehyde is likely formed directly from oxidation of methyl
group (not via alcohol). However, the aldehyde is also reduced to perillyl alcohol by the reduced form of the catalyst. 相似文献
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Nuria Ortega Andrs Feher‐Voelger Margarita Brovetto Juan I. Padrn Victor S. Martín Toms Martín 《Advanced Synthesis \u0026amp; Catalysis》2011,353(6):963-972
A novel halogenation reaction from sulfonates catalyzed by iron(III) is described. The reaction can be performed as a stoichiometric or a catalytic version. This reaction provides a convenient strategy for the efficient access to structurally diverse secondary chlorides, bromides and iodides. The stereochemical course of the reaction is governed by the substrate and the experimental conditions. Secondary alcohols modified as quisylates or pysylates are substantially more reactive. Aliphatic quisylates proceed with overall inversion of configuration under catalytic conditions. Chemoselectivity in bismesylates was observed in favour of the secondary mesylate. Additionally, based on the experimental results, a possible catalytic cycle for the halogenation has been proposed. 相似文献
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Oxidation of primary and secondary aliphatic and secondary benzylic alcohols into their corresponding aldehydes and ketones was achieved in good yields with palladium catalysts using air as the reoxidant of palladium. The use of palladacycle 1 resulted in higher yields and a faster reaction than the use of Pd(OAc)2 as the palladium source. 相似文献
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Ruizhu Mu Zhongquan Liu Zhanjun Yang Zhengang Liu Longmin Wu Zhong‐Li Liu 《Advanced Synthesis \u0026amp; Catalysis》2005,347(10):1333-1336
A transition metal‐free aerobic oxidation of alcohols to the corresponding aldehydes or ketones can be effectively catalysed by iodoxybenzene (PhIO2)/Br2/NaNO2 in water. 相似文献
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In the catalytic reaction of an iron(III) porphyrin with t-BuOOH, CumOOH, H2O2 and C6F5IO, cyclohexene was used as a probe substrate. The selective hydroxylation of cyclohexene by hydroperoxides proceeds through radical path and this has been utilized for successful dioxygen activation/autooxidation. For other oxidants epoxide was the major product and the reactions proceed through non-radical path. 相似文献
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Sk. Manirul Islam Kajari Ghosh Anupam Singha Roy Noor Salam Tanmay Chatterjee 《Journal of Inorganic and Organometallic Polymers and Materials》2014,24(2):457-467
A polymer-anchored iron(III) catalyst was synthesized and characterized. Its catalytic activity was evaluated for the oxidation of various alkenes, sulfides, aromatic alcohols and ethylbenzene with 30 % H2O2 as the oxidizing agent. The catalyst was also effective for the oxidative bromination reaction with 80–100 % selectivity of monobrominated products with H2O2/KBr at room temperature. The above reactions require a minimum amount of H2O2 and short reaction time. Most importantly, all the above reactions occur in aqueous medium. The catalyst can be facilely recovered and reused six-atimes without significant decrease in its activity and selectivity. 相似文献
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A variety of iron-metallated functional porphyrins have been synthesized and their catalytic activity to oxidize polycyclic aromatic hydrocarbons, (PAHs) using hydrogen peroxide as oxidant was investigated. It was found that iron-metallated porphyrins bearing strong electronegative groups at β-pyrrolic positions show an exceptionally high catalytic efficiency. 相似文献
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Zirconium sulfate (Zr(SO4)2 · 4H2O) was an efficient catalyst for the esterification of fatty acids and alcohols under solvent-free condition. The esterification of fatty acid with branched alcohols using Zr(SO4)2 · 4H2O catalyst gave a good yield of the corresponding ester. The zirconium sulfate Bronsted acid site was suggested to be the catalytically active species in this reaction. In addition, Zr(SO4)2 · 4H2O compound is a potential green catalyst due to its high catalytic activity and low toxicity. This compound is also cost effective, easy to handle, is easily recovered by simple filtration and can be recycled for further reactions. 相似文献
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The environmentally benign polymerization of aniline provided polyaniline with an emeraldine structure by using iron(III) and ozone which is easily converted from oxygen in air. The influence of the reaction temperature upon the molecular weight of the polyaniline in this system is different from that in the polymerization of aniline using ammonium peroxodisulfate as an oxidant. Although the polyaniline prepared here has low molecular weight, the low molecular weight of the polyaniline does not significantly influence the electrical conductivity of cast films. In contrast, this can provide an advantage for the engineering of polyaniline through solution‐processing. Kinetics of oxidation reactions in the polymerization, systematically investigated here, has revealed that polyaniline is produced catalytically in terms of iron(III) and that an oxidation reaction of iron(II) to iron(III) could be a rate‐determining step in the polymerization. 相似文献
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MichaelG. Coleman AlecN. Brown BrettA. Bolton Hairong Guan 《Advanced Synthesis \u0026amp; Catalysis》2010,352(6):967-970
A (hydroxycyclopentadienyl)iron dicarbonyl hydride catalyzes the Oppenauer‐type oxidation of alcohols with acetone as the hydrogen acceptor. Many functional groups are tolerant to the oxidation conditions. The same complex also catalyzes the dehydrogenation of diols to lactones. A mechanism involving the formation of iron‐alcohol complexes and their rapid ligand exchange with free alcohols is proposed. The trimethylsilyl groups on the cyclopentadienyl ligand of the catalyst play a critical role in stabilizing the iron hydride and increasing the catalyst lifetime. 相似文献
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Benoît Join Konstanze Mller Carolin Ziebart Kristin Schrder Dirk Grdes Kerstin Thurow Anke Spannenberg Kathrin Junge Matthias Beller 《Advanced Synthesis \u0026amp; Catalysis》2011,353(16):3023-3030
A convenient and selective oxidation of alcohols with hydrogen peroxide to give aldehydes and ketones has been developed. Using in situ generated iron chloride complexes [Fe( L3 )2Cln] [n=0–1, L3 =6‐(N‐phenylbenzimidazoyl)‐2‐pyridinecarboxylic acid], aldehydes and ketones were obtained in good yield and excellent selectivity after a short reaction time at room temperature. 相似文献
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Roozbeh Javad Kalbasi Amir Abbas Nourbakhsh Maniya Zia 《Journal of Inorganic and Organometallic Polymers and Materials》2012,22(2):536-542
Heterogeneous hybrid polymer-inorganic copper nanoparticle-polyacrylamide/SBA-15 was prepared, characterized and tested as
a catalyst for efficiently selective oxidation of alcohols to aldehydes in high yields under molecular oxygen in n-hexane
solvent. The catalyst can be recycled over six-times without significant loss of activity. 相似文献