scholarly journals One-step upgrading of bio-based furfural to γ-valerolactone via HfCl4-mediated bifunctional catalysis

RSC Advances ◽  
2021 ◽  
Vol 11 (56) ◽  
pp. 35415-35424
Author(s):  
Mingrui Li ◽  
Yixuan Liu ◽  
Xialing Lin ◽  
Jinyu Tan ◽  
Song Yang ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Bifunctional Catalysis ◽  
Acid Base ◽  
One Pot ◽  
One Step ◽  
The One

The one-pot multi-step conversion of biomass-derived furfural to γ-valerolactone (GVL) with 64.5% yield is achieved via acid–base bifunctional catalysis enabled by HfCl4 in 2-propanol, and the recovered solid is active for transfer hydrogenation.

A Study on the Rearrangement of Dialkyl 1-Aryl-1-hydroxymethylphosphonates to Benzyl Phosphates

2020 ◽  
Vol 24 (4) ◽  
pp. 465-471 ◽  
Author(s):  
Zita Rádai ◽  
Réka Szabó ◽  
Áron Szigetvári ◽  
Nóra Zsuzsa Kiss ◽  
Zoltán Mucsi ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Room Temperature ◽  
Phase Transfer ◽  
One Pot ◽  
Substrate Dependence ◽  
Triethylbenzylammonium Chloride ◽  
One Step ◽  
The Pudovik Reaction ◽  
The One ◽  
Solid Liquid

The phospha-Brook rearrangement of dialkyl 1-aryl-1-hydroxymethylphosphonates (HPs) to the corresponding benzyl phosphates (BPs) has been elaborated under solid-liquid phase transfer catalytic conditions. The best procedure involved the use of triethylbenzylammonium chloride as the catalyst and Cs2CO3 as the base in acetonitrile as the solvent at room temperature. The substrate dependence of the rearrangement has been studied, and the mechanism of the transformation under discussion was explored by quantum chemical calculations. The key intermediate is an oxaphosphirane. The one-pot version starting with the Pudovik reaction has also been developed. The conditions of this tandem transformation were the same, as those for the one-step HP→BP conversion.

An efficient and recyclable acid–base bifunctional core–shell nano-catalyst for the one-pot deacetalization–Knoevenagel tandem reaction

2018 ◽  
Vol 42 (14) ◽  
pp. 11610-11615 ◽  
Author(s):  
Zitao Wang ◽  
Xiaofeng Yuan ◽  
Qi’an Cheng ◽  
Tichun Zhang ◽  
Jun Luo
Keyword(s):  
Tandem Reaction ◽  
Core Shell ◽  
Acid Base ◽  
One Pot ◽  
Recoverable Catalyst ◽  
Nano Catalyst ◽  
The One

An acid–base bifunctional nano-catalyst was synthesized and applied as an efficient and recoverable catalyst in the one-pot deacetalization–Knoevenagel tandem reaction.

scholarly journals Rhodium catalyzed cascade cyclization featuring B–H and C–H activation: one-step construction of carborane-fused N-polyheterocycles

2018 ◽  
Vol 9 (30) ◽  
pp. 6390-6394 ◽  
Author(s):  
Hairong Lyu ◽  
Yangjian Quan ◽  
Zuowei Xie
Keyword(s):  
Reaction Mechanism ◽  
Structural Identification ◽  
One Pot ◽  
Cascade Cyclization ◽  
One Step ◽  
The One

A novel Rh-catalyzed cascade cyclization featuring both carboranyl B–H and aryl C–H activation has been developed, resulting in the one-pot construction of three new B–C and C–C bonds. The isolation and structural identification of a key intermediate provide solid evidence for the reaction mechanism.

Pyridine-grafted graphene oxide: a reusable acid–base bifunctional catalyst for the one-pot synthesis of β-phosphonomalonates via a cascade Knoevenagel–phospha Michael addition reaction in water

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 96532-96538 ◽  
Author(s):  
Sara Sobhani ◽  
Farzaneh Zarifi
Keyword(s):  
Graphene Oxide ◽  
Michael Addition ◽  
Addition Reaction ◽  
Bifunctional Catalyst ◽  
Michael Addition Reaction ◽  
Acid Base ◽  
One Pot ◽  
One Pot Synthesis ◽  
The One ◽  
Reaction In Water

Py–GO as a new acid–base bifunctional catalyst was synthesized and employed for the one-pot synthesis of β-phosphonomalonates in water.

scholarly journals 1-(4-Nitrophenyl)-1H-1,2,3-Triazole-4-carbaldehyde: Scalable Synthesis and Its Use in the Preparation of 1-Alkyl-4-Formyl-1,2,3-triazoles

Organics ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 404-414
Author(s):  
Tomas Opsomer ◽  
Kaat Valkeneers ◽  
Ana Ratković ◽  
Wim Dehaen
Keyword(s):  
One Pot ◽  
Complete Hydrolysis ◽  
One Step ◽  
Synthetic Intermediates ◽  
Cornforth Rearrangement ◽  
Scalable Synthesis ◽  
The One ◽  
Novel Applications ◽  
Hydrolysis Of

1,2,3-Triazole-4-carbaldehydes are useful synthetic intermediates which may play an important role in the discovery of novel applications of the 1,2,3-triazole moiety. In this work, a one-step multigram scale synthesis of 4-formyl-1-(4-nitrophenyl)-1H-1,2,3-triazole (FNPT) as a preferred reagent for the synthesis of 1-alkyl-4-formyltriazoles is described, making use of the commercially available 3-dimethylaminoacrolein and 4-nitrophenyl azide. Next, the earlier reported reaction of FNPT with alkylamines is further explored, and for hexylamine, the one-pot sequential cycloaddition and Cornforth rearrangement is demonstrated. In addition, a useful protocol for the in situ diazotization of 4-nitroaniline is provided. This facilitated the complete hydrolysis of rearranged 4-iminomethyl-1,2,3-triazoles and allowed for the recycling of 4-nitrophenyl azide.

scholarly journals Recyclable Zr/Hf-Containing Acid-Base Bifunctional Catalysts for Hydrogen Transfer Upgrading of Biofuranics: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Yixuan Liu ◽  
Xixi Liu ◽  
Mingrui Li ◽  
Ye Meng ◽  
Jie Li ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Hydrogen Transfer ◽  
Precious Metals ◽  
Renewable Resource ◽  
Transfer Hydrogenation ◽  
Bifunctional Catalysts ◽  
Acid Base ◽  
One Pot ◽  
Catalytic Material ◽  
Metal Organic

The massive burning of a large amount of fossil energy has caused a lot of serious environmental issues (e.g., air pollution and climate change), urging people to efficiently explore and valorize sustainable alternatives. Biomass is being deemed as the only organic carbon-containing renewable resource for the production of net-zero carbon emission fuels and fine chemicals. Regarding this, the selective transformation of high-oxygen biomass feedstocks by catalytic transfer hydrogenation (CTH) is a very promising strategy to realize the carbon cycle. Among them, the important Meerwein-Ponndorf-Verley (MPV) reaction is believed to be capable of replacing the traditional hydrogenation strategy which generally requires high-pressure H2 and precious metals, aiming to upgrade biomass into downstream biochemical products and fuels. Employing bifunctional heterogeneous catalysts with both acidic and basic sites is needed to catalyze the MPV reaction, which is the key point for domino/cascade reaction in one pot that can eliminate the relevant complicated separation/purification step. Zirconium (Zr) and hafnium (Hf), belonging to transition metals, rich in reserves, can demonstrate similar catalytic efficiency for MPV reaction as that of precious metals. This review introduced the application of recyclable heterogeneous non-noble Zr/Hf-containing catalysts with acid-base bifunctionality for CTH reaction using the safe liquid hydrogen donor. The corresponding catalysts were classified into different types including Zr/Hf-containing metal oxides, supported materials, zeolites, metal-organic frameworks, metal-organic hybrids, and their respective pros and cons were compared and discussed comprehensively. Emphasis was placed on evaluating the bifunctionality of catalytic material and the key role of the active site corresponding to the structure of the catalyst in the MPV reaction. Finally, a concise summary and prospect were also provided centering on the development and suggestion of Zr/Hf-containing acid-base bifunctional catalysts for CTH.

scholarly journals One-pot rota-crystallized hollownest-structured Ti–zeolite: a calcination-free and recyclable catalytic material

2016 ◽  
Vol 7 (8) ◽  
pp. 4966-4972 ◽  
Author(s):  
Dan Zhou ◽  
Tianjun Zhang ◽  
Qinghua Xia ◽  
Yarong Zhao ◽  
Kexin Lv ◽  
...  
Keyword(s):  
Zeolite A ◽  
One Pot ◽  
Crystallization Method ◽  
Catalytic Material ◽  
One Step ◽  
The One

A hydrothermal rota-crystallization method is developed for the one-step synthesis of a hollownest-structured zeolite precursor with the shell composed of autogenously-intergrown MWW nanosheet crystals containing a large number of stacking-pores without any porogen or hard scaffold.

A programmable Y-shaped junction scaffold-mediated modular and cascade amplification strategy for the one-step, isothermal and ultrasensitive detection of target DNA

2015 ◽  
Vol 51 (100) ◽  
pp. 17756-17759 ◽  
Author(s):  
Shufeng Liu ◽  
Hongwei Gong ◽  
Xinya Sun ◽  
Tao Liu ◽  
Li Wang
Keyword(s):  
Ultrasensitive Detection ◽  
One Pot ◽  
Target Dna ◽  
One Step ◽  
The One ◽  
Amplification Strategy ◽  
Cascade Amplification ◽  
Junction Probe

A programmable Y-shaped junction probe-mediated modular and cascade amplification strategy was proposed for the one-pot, isothermal and ultrasensitive detection of target DNA.

scholarly journals One Pot Synthesis of CoTiO3-TiO2 Composite Nanofibers and its Application in Dye Degradation

2021 ◽  
pp. 1597-1607
Author(s):  
M. Shamshi Hassan
Keyword(s):  
Visible Light ◽  
Composite Nanofibers ◽  
Dye Degradation ◽  
Band Gap Energy ◽  
One Pot ◽  
Light Region ◽  
Composite Photocatalysts ◽  
One Step ◽  
Ft Ir ◽  
The One

CoTiO3-TiO2 composite nanofibrous photocatalysts were synthesized by means of the one-step electrospinning method. The samples were characterized by a range of different methods (XRD, SEM, EPMA, FT-IR, UV-DRS, and TEM). Photocatalytic activity was performed for the degradation of rhodamine 6G under visible light. The results showed that CoTiO3-TiO2 composite photocatalysts were successfully synthesized. The average sizes of the diameters of the composite nanofibers were found to be 300 to 400 nm. The UV–Vis diffuse reflectance spectra of the CoTiO3-TiO2 composite showed an absorption wavelength, in the visible light region, having a band gap energy value of 2.21 eV. The CoTiO3-TiO2 composite showed higher photocatalytic efficiency than that of pristine TiO2; which can be attributed to the heterojunctional interaction between CoTiO3 and TiO2.

Catalytic transfer hydrogenation of azobenzene by low-valent nickel complexes: a route to 1,2-disubstituted benzimidazoles and 2,4,5-trisubstituted imidazolines

2016 ◽  
Vol 45 (25) ◽  
pp. 10389-10401 ◽  
Author(s):  
Daniel A. Zurita ◽  
Marcos Flores-Alamo ◽  
Juventino J. García
Keyword(s):  
Nickel Complexes ◽  
Hydrogen Donor ◽  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
One Pot ◽  
One Pot Synthesis ◽  
Catalytic Transfer ◽  
Low Valent ◽  
The One

The one-pot synthesis of 1,2-disubstituted benzimidazoles by the transfer hydrogenation of azobenzene, using benzylamine as a hydrogen donor is reported, catalyzed by 2 mol% of [Ni(COD)2] : dippe.

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