Engineering the surface of cuprous oxide via surface coordination for efficient catalysis on aerobic oxidation of benzylic alcohols under ambient conditions

2021 ◽  
Vol 543 ◽  
pp. 148840
Author(s):  
Yunlian Yang ◽  
Wei Zhong ◽  
Ruonan Ma ◽  
Chunxin Lu ◽  
Zhongquan Shen ◽  
...  
Keyword(s):  
Cuprous Oxide ◽  
Aerobic Oxidation ◽  
Ambient Conditions ◽  
Benzylic Alcohols

Study of aerobic oxidation of phenyl PtII complexes (dpms)PtIIPh(L) (dpms = di(2-pyridyl)methanesulfonate; L = water, methanol, or aniline)

2009 ◽  
Vol 87 (1) ◽  
pp. 110-120 ◽  
Author(s):  
Julia R Khusnutdinova ◽  
Peter Y Zavalij ◽  
Andrei N Vedernikov
Keyword(s):  
Aqueous Solution ◽  
Aerobic Oxidation ◽  
Reductive Elimination ◽  
High Yield ◽  
Ambient Conditions ◽  
Activation Barriers ◽  
Methanol Solutions ◽  
Anionic Species ◽  
Mechanism Of Oxidation ◽  
Solution Mechanism

Oxidation of phenyl PtII complexes K[(dpms)PtIIPh2], 1, (dpms)PtIIPh(MeOH), 2, (dpms)PtIIPh(OH2), 3, and methyl PtII complex (dpms)PtIIMe(NH2Ph), 6, with O2 in aqueous or methanol solutions under ambient conditions leads to corresponding (dpms)PtIVR(X)OH complexes (R = X = Ph, 7; R = Ph, X = OH, 8; R = Ph, X = OMe, 9; R = Me, X = NHPh; 11; dpms = di(2-pyridyl)methanesulfonate). Complexes 7–9 could be isolated in high yield. Complex 11 as well as its phenyl analogue (dpms)PtIVPh(NHPh)OH, 10 can be prepared in high yield by oxidation of corresponding (dpms)PtIIR(NH2Ph) with H2O2 in methanol. Phenyl PtII complexes (dpms)PtIIPh(HX) derived from HX = aniline and DMSO, 4 and 5, respectively, are inert toward O2. The rate of oxidation of 1–5 with O2 decreases in the order 1 > 3 ~ 2 » 4, and 5 is unreactive. Methyl analogues are significantly more reactive compared with their phenyl counterparts. Proposed mechanism of oxidation with O2 includes formation of anionic species (dpms)PtIIR(X)– responsible for reaction with dioxygen. Attempts at C–O and C–N reductive elimination from phenyl PtIV complexes 7–10 do not lead to phenyl derivatives PhX at 80–100 °C, consistent with the results of the DFT estimates of corresponding activation barriers, ΔG0 exceeding 28 kcal/mol.Key words: platinum phenyl complexes, oxidation, dioxygen, aqueous solution, mechanism.

Effect of NABr on the Pore Size and Surface Morphology of Cu Foam Prepared by Hydrogen Bubble Templating

2021 ◽  
Vol 880 ◽  
pp. 83-88
Author(s):  
Mary Donnabelle L. Balela ◽  
Reginald E. Masirag ◽  
Francis O. Pacariem Jr. ◽  
Juicel Marie D. Taguinod
Keyword(s):  
Polyethylene Glycol ◽  
Cuprous Oxide ◽  
Active Material ◽  
Current Collector ◽  
Hydrogen Bubble ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cu Foam ◽  
Interconnected Pores

Binderless supercapacitor electrodes are currently being employed to increase the surface contact between the active material and current collector, leading to enhanced capacitance. In binderless electrodes, the active material is directly grown on the surface of the current collector, omitting the use of insulative polymer-based binders. In this work, Cu foam was successfully electrodeposited on Cu sheet by dynamic hydrogen bubble templating (DHBT) using polyethylene glycol (PEG) and sodium bromide (NaBr) as additives. The current density was set at 3 A·cm-2 and electrodeposition was performed for 20 s. At 200 mg/L PEG, increasing the NaBr concentration from 0 to 80 mM produced Cu foam with decreasing pores sizes of about 75.15 to 34.10 μm. However, the walls of the interconnected pores became thicker as the pore diameters were reduced. This indicates that NaBr promotes Cu deposition rather than hydrogen evolution reaction (HER), leading to smaller pore sizes. X-ray diffraction confirms the oxidation of the Cu foam under ambient conditions forming cuprous oxide (Cu2O). The Cu2O/Cu foam was then utilized as binderless electrode for supercapacitor, resulting to a specific capacitance of 0.815 F·cm-2 at 5 mV·s-1. Results show the potential of the fabricated Cu2O/Cu foam as binderless electrode for pseudo-type supercapacitors.

Selective Aerobic Oxidation of Benzylic Alcohols Catalyzed by Carbon‐Based Catalysts: A Nonmetallic Oxidation System

2010 ◽  
Vol 49 (2) ◽  
pp. 436-440 ◽  
Author(s):  
Yongbo Kuang ◽  
Nazrul M. Islam ◽  
Yuta Nabae ◽  
Teruaki Hayakawa ◽  
Masa‐aki Kakimoto
Keyword(s):  
Aerobic Oxidation ◽  
Benzylic Alcohols ◽  
Selective Aerobic Oxidation ◽  
Oxidation System ◽  
Carbon Based

AIBN/NaBr-promoted aerobic oxidation of benzylic alcohols via a radical process

2016 ◽  
Vol 14 (2) ◽  
pp. 577-581 ◽  
Author(s):  
Chengkou Liu ◽  
Zheng Fang ◽  
Zhao Yang ◽  
Qingwen Li ◽  
Shiyu Guo ◽  
...  
Keyword(s):  
Aerobic Oxidation ◽  
Alcohol Oxidation ◽  
Radical Mechanism ◽  
Radical Process ◽  
Benzylic Alcohols ◽  
First Time ◽  
Oxidation System

A new aerobic alcohol oxidation system of AIBN/NaBr was described for the first time. Moreover, a radical mechanism was assumed and confirmed.

A remarkable effect of ionic liquids in transition-metal-free aerobic oxidation of benzylic alcohols

2011 ◽  
Vol 52 (41) ◽  
pp. 5392-5394 ◽  
Author(s):  
Yoshiro Oda ◽  
Koji Hirano ◽  
Tetsuya Satoh ◽  
Susumu Kuwabata ◽  
Masahiro Miura
Keyword(s):  
Ionic Liquids ◽  
Transition Metal ◽  
Aerobic Oxidation ◽  
Remarkable Effect ◽  
Benzylic Alcohols ◽  
Metal Free

Studies on Iron-Catalyzed Aerobic Oxidation of Benzylic Alcohols to Carboxylic Acids

Synthesis ◽  
2018 ◽  
Vol 50 (08) ◽  
pp. 1629-1639 ◽  
Author(s):  
Shengming Ma ◽  
Xingguo Jiang
Keyword(s):  
Carboxylic Acids ◽  
Large Scale ◽  
Aerobic Oxidation ◽  
Catalytic Amount ◽  
Steric Effects ◽  
Benzylic Alcohols ◽  
Academic Laboratory ◽  
Electron Donating Groups ◽  
Electronic And Steric Effects ◽  
Comprehensive Study

A comprehensive study on aerobic oxidation of benzylic alcohols­ to carboxylic acids with a catalytic amount each of Fe(NO3)3·9H2O, TEMPO, and KCl is conducted. Various synthetically useful functional groups are well tolerated in the reaction. Distinct electronic and steric effects are observed in the reaction: electron-withdrawing groups accelerate the reaction while electron-donating groups make the reaction slower, and ortho-substituted substrates react slower than meta-substituted substrates. Several large-scale reactions (100 mmol) are conducted using a slow air flow of 30 mL/min to demonstrate the practicality of this method in an academic laboratory.

Quantitative Aerobic Oxidation of Primary Benzylic Alcohols to Aldehydes Catalyzed by Highly Efficient and Recyclable P123-Stabilized Pd Nanoclusters in Acidic Aqueous Solution

ACS Catalysis ◽  
2013 ◽  
Vol 3 (12) ◽  
pp. 3063-3066 ◽  
Author(s):  
Ruirui Dun ◽  
Xueguang Wang ◽  
Mingwu Tan ◽  
Zhen Huang ◽  
Xuemin Huang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aerobic Oxidation ◽  
Acidic Aqueous Solution ◽  
Benzylic Alcohols ◽  
Highly Efficient
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