872-85-5Relevant articles and documents
TEMPO mediated electrocatalytic oxidation of pyridyl carbinol using palladium nanoparticles dispersed on biomass derived porous nanoparticles
B, Akshaya K.,Bhat, Vinay S.,Hegde, Gurumurthy,Mathew, Agnus T.,S, Supriya,T, Maiyalagan,Varghese, Anitha
, (2020)
Remarkable electrocatalytic property of Pd nanostructures dispersed on CNSareca coated CFP electrode towards TEMPO mediated electrooxidation of pyridyl carbinol was reported for the first time. Carbon nanospheres (CNSs) derived from Areca catechu decorated with Pd nanoparticles were coated on carbon fiber paper (CFP) and was employed for electrooxidation of pyridyl carbinol in aqueous acidic medium. An environmentally benign and economic strategy was utilized for the preparation of CNSs obtained from Areca catechu. The physical characterizations, electronic state and chemical composition of the modified electrode were studied using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) spectroscopy and X-ray photoelectron spectroscopy (XPS). Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) techniques were used for analyzing the morphology of modified electrode. The electrochemical characterizations of the modified electrodes were performed by Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS). Pd decorated CNSareca dispersed on CFP electrode has exhibited strong electrocatalytic activity towards TEMPO mediated oxidation of pyridyl carbinol.
Facile construction of leaf-like WO3 nanoflakes decorated on g-C3N4 towards efficient oxidation of alcohols under mild conditions
Xu, Cai,Wang, Xiaozhong,Xu, Gang,Chen, Yingqi,Dai, Liyan
, p. 16523 - 16532 (2018)
Herein, a well-defined nanostructure with leaf-like WO3 nanoflakes decorated on g-C3N4 was constructed via a facile impregnation and subsequent annealing method. The prepared WO3/g-C3N4 exhibited excellent catalytic activity for the selective oxidation of alcohols under mild conditions, and satisfactory yields to the corresponding carbonyl compounds were achieved without using non-green additives and organic solvents. It was found that the enhanced catalytic activity could be attributed to the enlarged specific surface area, the well-defined nanostructure, and the strong interactions between WO3 and g-C3N4. The distribution of WO3 nanoflakes on the g-C3N4 support increased the number of catalytically active sites for this reaction. XPS analysis suggested that a synergistic electron effect occurred because of the electron transfer from g-C3N4 to WO3. Moreover, the effects of reaction temperature, reaction time, oxidant amount and catalyst dosage on catalytic activity were investigated. Recycle studies showed that the catalyst could be readily recovered and no obvious decrease in catalytic efficiency was observed after seven cycles. The present catalytic system can afford a wide substrate scope for both aryl and alkyl alcohols with superior conversion and selectivity. Also, a plausible reaction mechanism was proposed to better illustrate the catalytic process. This work might provide a facile construction of a well-defined WO3/g-C3N4 catalyst for the selective oxidation of alcohols using a sustainable approach.
Zn-doped W/aluminium oxide catalyst: Efficient strategy towards sustainable oxidation of alcohols
An, Yu,Cai, Menglu,Chen, Yingqi,Dai, Liyan,Fang, Yangyang,Li, Jun,Wang, Xiaozhong,Zhang, Ming
, (2020)
Bifunctional catalysts have been considered to have vital importance in catalytic chemical process, but there is still some developing room for convenient materials with dual active sites. These catalysts have a notorious reputation for inhibiting mutual neutralization and controlling the distribution of active sites in order to perform their functions. We tailor a series of W-Zn-Al2O3 catalysts by modulating the doping density of metal species, which can boost the catalytic process of alcohols into corresponding carbonyl compounds in an additive-free-condition. Test results indicate that the proper content of zinc element can promote the overall activities, and subsequent adjustment of doping zinc can dramatically increase the electronic interaction and change the distribution of chemical active sites. Also, a plausible reaction mechanism was proposed to better understand the acid-base bifunctional catalytic process. Theoretical results confirm this system can provide certain references for similar reactants. Present reaction system is a green procedure and features a broad substrate scope, which reveals a sustainable method to process oxidative dehydrogenation reaction.
Self-promoted vanadium-catalyzed oxidation of pyridinemethanol with molecular oxygen
Du, Zhongtian,Li, Meijin,Tang, Yangyang,Wang, Wanhui,Xiao, Yonghou
, (2020)
Catalytic oxidation of alcohols containing heteroatoms with molecular oxygen is usually rather challenging, as transition metal catalysts are easily deactivated by heteroatoms. In contrast to conventional results, herein facile oxidation of 2-pyridinemethanol with dioxgyen was observed over simple vanadium catalysts including VOSO4 or VO(acac)2, which seemed much easier than that of benzyl alcohol. 2-Pyridinemethanol could coordinate with the vanadium center, which would promote oxidation of 2-pyridinemethanol itself, rather than deactivate vanadium catalysts. This study would provide a new clue to develop efficient catalysts for transformations of heterocyclic compounds.
An aerobic oxidation of alcohols into carbonyl synthons using bipyridyl-cinchona based palladium catalyst
Cheedarala, Ravi Kumar,Chidambaram, Ramasamy R.,Siva, Ayyanar,Song, Jung Il
, p. 32942 - 32954 (2021/12/02)
We have reported an aerobic oxidation of primary and secondary alcohols to respective aldehydes and ketones using a bipyridyl-cinchona alkaloid based palladium catalytic system (PdAc-5) using oxygen at moderate pressure. ThePdAc-5catalyst was analysed using SEM, EDAX, and XPS analysis. The above catalytic system is used in experiments for different oxidation systems which include different solvents, additives, and bases which are cheap, robust, non-toxic, and commercially available on the industrial bench. The obtained products are quite appreciable in both yield and selectivity (70-85%). In addition, numerous important studies, such as comparisons with various commercial catalysts, solvent systems, mixture of solvents, and catalyst mole%, were conducted usingPdAc-5. The synthetic strategy of oxidation of alcohol into carbonyl compounds was well established and all the products were analysed using1H NMR,13CNMR and GC-mass analyses.
Combining photo-redox and enzyme catalysis for the synthesis of 4H-pyrimido[2,1-b] benzothiazole derivatives in one pot
Yu, Yuan,Lu, Wei-Fan,Yang, Zeng-Jie,Wang, Na,Yu, Xiao-Qi
supporting information, (2020/12/25)
A novel strategy combining visible-light and enzyme catalysis in one pot for the synthesis of 4H-pyrimido[2,1-b] benzothiazole derivatives from alcohols is described for the first time. Fourteen 4H-pyrimido[2,1-b] benzothiazole derivatives were prepared with yields of up to 98% under mild reaction conditions by a simple operation. The photoorgano catalyst rose Bengal (rB) was employed to oxyfunctionalise alcohols to aldehydes. Compared with aldehydes, alcohols with more stable properties and lower cost, thus we used photocatalysis to oxidize alcohols into aldehydes. Next, the enzyme was used to further catalyze the reaction of Biginelli to produce the target product of 4H-pyrimidine [2,1-b] benzothiazole. Experimental results show that this method provides a more efficient and eco-friendly strategy for the synthesis of 4H-pyrimido[2,1-b] benzothiazole derivatives.
Iodine-imine Synergistic Promoted Povarov-Type Multicomponent Reaction for the Synthesis of 2,2′-Biquinolines and Their Application to a Copper/Ligand Catalytic System
Hu, Qi-Qi,Gao, Yan-Ting,Sun, Jia-Chen,Gao, Jing-Jing,Mu, Hong-Xiao,Li, Yi-Ming,Zheng, Ya-Nan,Yang, Kai-Rui,Zhu, Yan-Ping
supporting information, p. 9000 - 9005 (2021/11/24)
An efficient iodine-imine synergistic promoted Povarov-type multicomponent reaction was reported for the synthesis of a practical 2,2′-biquinoline scaffold. The tandem annulation has reconciled iodination, Kornblum oxidation, and Povarov aromatization, where the methyl group of the methyl azaarenes represents uniquely reactive input in the Povarov reaction. This method has broad substrate scope and mild conditions. Furthermore, these 2,2′-biquinoline derivatives had been directly used as bidentate ligands in metal-catalyzed reactions.
Palladium-Catalyzed Reductive Carbonylation of (Hetero) Aryl Halides and Triflates Using Cobalt Carbonyl as CO Source
Dogga, Bhushanarao,Joseph, Jayan T.,Kumar, C. S. Ananda
supporting information, p. 309 - 313 (2020/12/23)
An efficient protocol for the reductive carbonylation of (hetero) aryl halides and triflates under CO gas-free conditions using Pd/Co2(CO)8 and triethylsilane has been developed. The mild reaction conditions, enhanced chemoselectivity and, easy access to heterocyclic and vinyl carboxaldehydes highlights its importance in organic synthesis.
Samarium-based Grignard-type addition of organohalides to carbonyl compounds under catalysis of CuI
Liu, Chen,Liu, Yongjun,Qi, Yan,Song, Bin,Wang, Liang,Xiao, Shuhuan
supporting information, p. 6169 - 6172 (2021/06/30)
Grignard-type additions were readily achieved under the mediation of CuI (10 mol%) and samarium (2 equiv.) by employing various organohalides,e.g.benzyl, aryl, heterocyclic and aliphatic halides (Cl, Br or I), and diverse carbonyl compounds (e.g.carbonic esters, carboxylic esters, acid anhydrides, acyl chlorides, ketones, aldehydes, propylene epoxides and formamides) to afford alcohols, ketones and aldehydes, respectively, with high efficiency and chemoselectivity, in which the organosamarium intermediate might be involved.
Cyclohexene Promoted Efficient Biomimetic Oxidation of Alcohols to Carbonyl Compounds Catalyzed by Manganese Porphyrin under Mild Conditions?
Ji, Hong-Bing,Liu, Xiao-Hui,Xue, Can,Yu, Hai-Yang,Zhou, Xian-Tai
, (2020/04/08)
Selective oxidation of alcohols to corresponding carbonyl compounds is one of the most important processes both in academic and application research. As a kind of biomimetic catalyst, metalloporphyrins-catalyzed aerobic oxidation of alcohols with aldehyde as hydrogen donator is gathering much attention. However, using olefins as another kind hydrogen donator for aerobic oxidation of alcohols has not been reported. In this study, a system comprising managenese porphyrin and cyclohexene for biomimetic aerobic oxidation of alcohols to carbonyl compounds was developed. The catalytic system exhibited excellent catalytic performance and selectivity towards the corresponding products for most primary and secondary alcohols under mild conditions. Based on the results obtained from experiments as well as in situ EPR (electron paramagnetic resonance) and UV-vis spectroscopy, the role of cyclohexene was demonstrated.
