Room-temperature selective oxidation of 2-naphthol to BINOL using a Au/SrTiO3–H2O2 catalytic system

2015 ◽  
Vol 51 (100) ◽  
pp. 17669-17671 ◽  
Author(s):  
Shin-ichi Naya ◽  
Yuta Hiramoto ◽  
Miwako Teranishi ◽  
Hiroaki Tada
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Gold Nanoparticle ◽  
Selective Oxidation ◽  
Catalytic System ◽  
Room Temperature ◽  
Bond Formation ◽  
System P ◽  
Au Particle Size

Gold nanoparticle-loaded SrTiO3 (Au/SrTiO3) effectively catalyzes the selective C–C bond formation between 2-naphthol molecules to yield BINOL in the presence of H2O2, and the catalytic activity increases with decreasing Au particle size (d) in the range 2.6 ≤ d ≤ 8.9 nm.

The remarkable catalytic activity of ultra-small free-CeO2 nanoparticles in selective carbon–carbon bond formation reactions in water at room temperature

2015 ◽  
Vol 39 (7) ◽  
pp. 5350-5353 ◽  
Author(s):  
Subhash Banerjee
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Bond Formation ◽  
Ceo2 Nanoparticles ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Reusable Catalyst ◽  
Carbon Carbon Bond ◽  
Active Methylene Compounds ◽  
Active Methylene

A simple and efficient protocol for selective bis-Michael addition and mono-allylation of active methylene compounds has been demonstrated using ultra-small size (∼5 nm) uncapped cerium oxide nanoparticles (free-CeO2 NPs) as a reusable catalyst in water at room temperature.

scholarly journals Alkyne hydroarylation with Au N-heterocyclic carbene catalysts

2013 ◽  
Vol 9 ◽  
pp. 246-253 ◽  
Author(s):  
Cristina Tubaro ◽  
Marco Baron ◽  
Andrea Biffis ◽  
Marino Basato
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Room Temperature ◽  
Lower Activity ◽  
Gold Complexes ◽  
Preliminary Results ◽  
Acidic Conditions ◽  
A Minor ◽  
Neutral Conditions ◽  
Minor Extent

Mono- and dinuclear gold complexes with N-heterocyclic carbene (NHC) ligands have been employed as catalysts in the intermolecular hydroarylation of alkynes with simple unfunctionalised arenes. Both mono- and dinuclear gold(III) complexes were able to catalyze the reaction; however, the best results were obtained with the mononuclear gold(I) complex IPrAuCl. This complex, activated with one equivalent of silver tetrafluoroborate, exhibited under acidic conditions at room temperature much higher catalytic activity and selectivity compared to more commonly employed palladium(II) catalysts. Moreover, the complex was active, albeit to a minor extent, even under neutral conditions, and exhibited lower activity but higher selectivity compared to the previously published complex AuCl(PPh3). Preliminary results on intramolecular hydroarylations using this catalytic system indicate, however, that alkyne hydration by traces of water may become a serious competing reaction.

scholarly journals Selective Oxidation of Transient Organic Radicals in the Presence of Gold Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 727
Author(s):  
Viacheslav Shcherbakov ◽  
Sergey A. Denisov ◽  
Mehran Mostafavi
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Selective Oxidation ◽  
Room Temperature ◽  
Catalytic Effect ◽  
Organic Dyes ◽  
Organic Radicals ◽  
Species Concentration ◽  
Reactive Oxygen Species Concentration

The ability of gold nanoparticles (AuNPs) to catalyze reactions involving radicals is poorly studied. However, AuNPs are used in applications where chemical reactions involving transient radicals occur. Herein, we investigate AuNPs’ catalytic effect on 2-propanol oxidation and acetanilide hydroxylation in aqueous solutions under ionizing radiation at room temperature. In both cases, the presence of AuNPs led to selective oxidation of organic radicals, significantly changing the products’ composition and ratio. Based on these observations, we stress how AuNPs’ catalytic activity can affect the correctness of reactive oxygen species concentration determination utilizing organic dyes. We also provide a discussion on the role of AuNPs’ catalytic activity in the radiosensitization effect actively studied for radiotherapy.

scholarly journals Recyclable and reusable PdCl2(PPh3)2/PEG-400/H2O system for the hydrophenylation of alkynes with sodium tetraphenylborate

2020 ◽  
pp. 174751982093437
Author(s):  
Rong Liu ◽  
Tingli Zhang ◽  
Bin Huang ◽  
Mingzhong Cai
Keyword(s):  
Catalytic Activity ◽  
Petroleum Ether ◽  
Catalytic System ◽  
Room Temperature ◽  
Sodium Tetraphenylborate ◽  
Peg 400 ◽  
Apparent Loss ◽  
Internal Alkynes ◽  
High Yields

A stable and efficient PdCl2(PPh3)2/PEG-400/H2O catalytic system for the hydrophenylation reaction of alkynes has been developed. In the presence of 3 mol% PdCl2(PPh3)2 and 2 equiv. of HOAc, the hydrophenylation of both terminal and internal alkynes with sodium tetraphenylborate proceeded smoothly in a mixture of PEG-400 and water at room temperature or 50 °C to afford a variety of phenyl-substituted alkenes in moderate to high yields. The isolation of the products was easily performed by extraction with petroleum ether, and the PdCl2(PPh3)2/PEG-400/H2O system could be readily recycled and reused six times without apparent loss of catalytic activity.

Nano-rod ZnO as a novel and reusable catalyst for C−P bond formation and hydrophosphonation of isatin derivatives under solvent-free conditions

2013 ◽  
Vol 91 (11) ◽  
pp. 1117-1122 ◽  
Author(s):  
Mona Hosseini-Sarvari ◽  
Mina Tavakolian
Keyword(s):  
Catalytic System ◽  
Efficient Method ◽  
Room Temperature ◽  
Bond Formation ◽  
Significant Loss ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
Reaction Products ◽  
Solvent Free Conditions ◽  
Isatin Derivatives

A highly efficient method for the synthesis of α1-oxindole-α-hydroxyphosphonates via nano-rod ZnO catalyzed hydrophosphonation of isatin derivatives was developed. The reaction products are in excellent yields using the catalytic system nano-rod ZnO (25 mol%) under solvent-free conditions at room temperature. The catalyst can be reused several times without any significant loss of its activity.

Selective oxidation of crotyl alcohol by AuxPd bimetallic pseudo-single-atom catalysts

2020 ◽  
Vol 10 (22) ◽  
pp. 7706-7718
Author(s):  
Brandon A. Chivers ◽  
Robert W. J. Scott
Keyword(s):  
Gold Nanoparticle ◽  
Selective Oxidation ◽  
Room Temperature ◽  
High Selectivity ◽  
Alcohol Oxidation ◽  
Single Atom ◽  
Pd Catalysts ◽  
Crotyl Alcohol

Pseudo single-atom Pd catalysts dispersed in gold nanoparticle matrices show high selectivity and activity for room temperature crotyl alcohol oxidation.

Synthesis of medicinally important quinazolines decorated with 1,4-disubstituted-1,2,3-triazoles using CuSO4·5H2O–Et3N catalytic system

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23679-23684 ◽  
Author(s):  
Monika Vashist ◽  
Khushbu Kushwaha ◽  
Reena Kaushik ◽  
Subhash C. Jain
Keyword(s):  
Catalytic System ◽  
Room Temperature ◽  
Dipolar Cycloaddition ◽  
Terminal Alkyne ◽  
Sulfate Pentahydrate ◽  
System P ◽  
Direct Use

The direct use of Cu(ii) sulfate pentahydrate in the presence of triethylamine afforded 1,4-disubstituted-1,2,3-triazoles via 1,3-dipolar cycloaddition of terminal alkyne(s) to azide(s) at room temperature.

Introducing deep eutectic solvents as biorenewable media for Au(i)-catalysed cycloisomerisation of γ-alkynoic acids: an unprecedented catalytic system

2014 ◽  
Vol 50 (85) ◽  
pp. 12927-12929 ◽  
Author(s):  
María J. Rodríguez-Álvarez ◽  
Cristian Vidal ◽  
Josefina Díez ◽  
Joaquín García-Álvarez
Keyword(s):  
Catalytic System ◽  
Room Temperature ◽  
Eutectic Mixture ◽  
Deep Eutectic Solvents ◽  
Co Catalysts ◽  
System P

Cycloisomerisation reactions of γ-alkynoic acids can be conveniently performed in the eutectic mixture 1ChCl/2Urea at room temperature, under air and in the absence of co-catalysts by using a novel iminophosphorane–Au(i) complex.

Highly monodisperse Pt(0)@AC NPs as highly efficient and reusable catalysts: the effect of the surfactant on their catalytic activities in room temperature dehydrocoupling of DMAB

2016 ◽  
Vol 6 (6) ◽  
pp. 1685-1692 ◽  
Author(s):  
Betül Çelik ◽  
Esma Erken ◽  
Sinan Eriş ◽  
Yunus Yıldız ◽  
Birgütay Şahin ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Room Temperature ◽  
Catalytic Activities ◽  
Highly Efficient

The effect of the particle size and the stabilizing ligand on the catalytic activity has been investigated for the dehydrocoupling of DMAB [(CH3)2NHBH3].

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