1122-91-4Relevant articles and documents
Regioselective radical aminofluorination of styrenes
Zhang, Hongwei,Song, Yongcheng,Zhao, Jinbo,Zhang, Jingping,Zhang, Qian
, p. 11079 - 11083 (2014)
The copper-catalyzed radical aminofluorination of styrenes with N-fluorobenzenesulfonimide (NFSI) is realized with high regioselectivity thus affording aminofluorination products with regioselectivities opposite that of the palladium-catalyzed and noncatalyzed processes. Preliminary mechanistic studies suggested the reaction went through a radical pathway and was supported by DFT calculations. In these reactions NFSI is utilized as both a radical nitrogen source and radical fluorine source thus rendering it an attractive reagent.
Microwave-assisted chemoselective regeneration of carbonyl compounds from oximes by silica chromate/WET SiO2 under solvent-free conditions
Zolfigol, Mohammad Ali,Khazaei, Ardeshir,Ghorbani-Choghamarani, Arash,Rostami, Amin
, p. 2453 - 2458 (2006)
The regeneration of carbonyl compounds from oximes were performed by using silica chromate and wet SiO2 (w/w 50%) under microwave irradiation and solvent-free conditions with excellent yields. Copyright Taylor & Francis Group, LLC.
A mild and efficient method for the oxidation of benzylic alcohols by two-phase electrolysis
Raju, Thasan,Manivasagan, Sankar,Revathy, Balachandran,Kulangiappar, Kumarasamy,Muthukumaran, Arunachalam
, p. 3681 - 3684 (2007)
Electrochemical oxidation of benzylic and substituted benzylic alcohols by two-phase electrolysis yields the corresponding aldehydes as products. The reaction was carried out in a single compartment cell with platinum electrodes at room temperature in chloroform using an aqueous sodium bromide solution (25%) containing a catalytic amount of HBr. The two-phase electrolysis resulted in high yields (74-96%) of benzaldehyde from primary alcohols and secondary alcohols were oxidized to the corresponding ketone but only in low yields under these conditions.
Novel Schiff base Mn(III) and Co(II) complexes supported on Co nanoparticles: Efficient and recyclable magnetic nanocatalysts for alcohol oxidation
Keypour, Hassan,Saremi, Shokoufeh Ghahri,Veisi, Hojat,Azadbakht, Reza
, p. 77020 - 77029 (2016)
In this study, efficient and highly selective heterogeneous catalysts were developed by immobilization of manganese and cobalt Schiff base complexes on Co magnetite nanoparticles (MNPs). Firstly, Co@SiO2 core-shell nanoparticles were synthesized through a one-pot reaction. Secondly, the Co@SiO2 was amino-functionalized using 3-aminopropyl triethoxysilane and then Schiff base ligand Co@SiO2[(EtO)3Si-L2] was obtained by the reaction of the amino-functionalized nanoparticles with the dialdehyde of 1,2-bis(2-formyl naphthoxy methyl)benzene. Finally, Co@SiO2[(EtO)3Si-L2]/M (M = Mn(iii) and Co(ii)) were successfully synthesized. These surface-modified nanoparticles were characterized using various techniques such as TEM, XRD, TGA, SEM, VSM, XPS, EDX and FT-IR. The catalytic activities of the prepared catalysts were investigated by employing them in the oxidation of various aromatic alcohols with an environmentally friendly oxidant under mild conditions. The catalysts can be readily recovered and reused in at least 5 consecutive cycles without significant leaching and loss their catalytic activity.
Zinc Bismuthate Zn(BiO3)2. I. A Useful Oxidizing Agent for the Efficient Oxidation of Organic Compounds
Firouzabadi, Habib,Mohammadpour-Baltork, Iraj
, p. 1131 - 1134 (1992)
Zinc bismuthate is an easily prepared and a stable compound.It could be used as an oxidant in organic solvents under aprotic or in the presence of a catalytic amount of a protic solvent.Primary and secondary saturated, allylic, and benzylic alcohols are converted to their carbonyl compounds in high yields.Mildness of the reagent is shown by the oxidation of thiols to their disulfides in excellent yields.Thioethers are also oxidized to their corresponding sulfoxides in good yields.
Cerium-Complex-Catalyzed Oxidation of Arylmethanols under Atmospheric Pressure of Dioxygen and Its Mechanism through a Side-On μ-Peroxo Dicerium(IV) Complex
Paul, Mitali,Shirase, Satoru,Morimoto, Yuma,Mathey, Laurent,Murugesapandian, Balasubramanian,Tanaka, Shinji,Itoh, Shinobu,Tsurugi, Hayato,Mashima, Kazushi
, p. 4008 - 4014 (2016)
A new CeIV complex [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)2] (1), bearing a dianionic pentadentate ligand with an N3O2 donor set, has been prepared by treating (NH4)2Ce(NO3)6 with the sodium salt of ligand L1. Complex 1 in the presence of TEMPO and 4 ? molecular sieves (MS4 A) has been found to serve as a catalyst for the oxidation of arylmethanols using dioxygen as an oxidant. We propose an oxidation mechanism based on the isolation and reactivity study of a trivalent cerium complex [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)(THF)] (2), its side-on μ-O2 adduct [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)]2(μ-η2:η2-O2) (3), and the hydroxo-bridged CeIV complex [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)]2(μ-OH)2 (4) as key intermediates during the catalytic cycle. Complex 2 was synthesized by reduction of 1 with 2,5-dimethyl-1,4-bis(trimethylsilyl)-1,4-diazacyclohexadiene. Bubbling O2 into a solution of 2 resulted in formation of the peroxo complex 3. This provides the first direct evidence for cerium-catalyzed oxidation of alcohols under an O2 atmosphere. Cerium-catalyzed alcohol oxidation: A new CeIV complex [Ce{NH(CH2CH2N=CHC6H2-3,5-(tBu)2-2-O)2}(NO3)2] (1) has been shown to serve as a catalyst for the oxidation of arylmethanols using dioxygen as an oxidant in the presence of TEMPO and molecular sieves MS4 A (see scheme). CeIII complex 2, obtained by reduction of 1 with 2,5-dimethyl-1,4-bis(trimethylsilyl)-1,4-diazacyclohexadiene, reacted with O2 to give the peroxo complex 3. This provides the first direct evidence for operation of the peroxo mechanism in the cerium-catalyzed oxidation of alcohols under O2 atmosphere.
Synthetic utility of iodic acid in the oxidation of benzylic alcohols to aromatic aldehydes and ketones
Imai, Sho,Togo, Hideo
, p. 6948 - 6954 (2016)
Various primary and secondary benzylic alcohols were efficiently oxidized to aromatic aldehydes and aromatic ketones with iodic acid in DMF at 60?°C for 2?h and with iodic acid in the presence of TEMPO (5?mol?%) in DMF at room temperature, respectively. The former method was effective for the oxidation of sterically hindered alcohols at 60?°C and the latter method was effective for the oxidation of less sterically hindered alcohols at room temperature.
Oxidations with IBX: Benzyl halides to carbonyl compounds, and the one-pot conversion of olefins to 1,2-diketones
Moorthy, Jarugu Narasimha,Singhal, Nidhi,Senapati, Kalyan
, p. 1757 - 1761 (2006)
A variety of benzyl halides were converted to the corresponding aldehydes/ketones in respectable yields by IBX in DMSO at 65°C. The bromohydrin reaction of olefins using NBS-H2O in DMSO can be nicely adapted to IBX-mediated oxidation of benzyl halides in such a way that olefins are converted to the corresponding 1,2-diketones in good isolated yields in one-pot.
gem-Difluorination of 2,2-diaryl-1,3-dithiolanes by Selectfluor and pyridinium polyhydrogen fluoride
Reddy, V. Prakash,Alleti, Ramesh,Perambuduru, Meher K.,Welz-Biermann, Urs,Buchholz, Herwig,Prakash, G. K. Surya
, p. 654 - 656 (2005)
2,2-Diaryl-1,3-dithiolanes, readily obtainable from diaryl ketones, were transformed into the corresponding gem-difluoro compounds using a novel reagent combination involving Selectfluor and pyridinium polyhydrogen fluoride (PPHF) under mild conditions in moderate to good yields. The Royal Society of Chemistry 2005.
"Click Chemistry" Mediated Functional Microporous Organic Nanotube Networks for Heterogeneous Catalysis
Yu, Wei,Zhou, Minghong,Wang, Tianqi,He, Zidong,Shi, Buyin,Xu, Yang,Huang, Kun
, p. 5776 - 5779 (2017)
The synthesis of azide functional microporous organic nanotube networks (N3-MONNs) via a Friedel-Crafts hyper-cross-linking reaction is reported. Subsequently, a general method for obtaining heterogeneous catalysts through a Cu-catalyzed alkyne-azide reaction is presented. The small-molecule catalysts such as 2,2,6,6,-tetramethylpiperidine-1-oyl and 4-(N,N-dimethylamino)pyridine can be anchored into the MONNs. Owing to the hierarchically porous structure and high surface area, these catalysts show high activity in selective oxidation of alcohols and acylation reaction, respectively.
