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 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.

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.

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.

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.

One-pot synthesis of sulfur-doped graphene quantum dots as a novel fluorescent probe for highly selective and sensitive detection of lead(ii)

RSC Advances ◽  
2016 ◽  
Vol 6 (74) ◽  
pp. 69977-69983 ◽  
Author(s):  
Shiyue Bian ◽  
Chao Shen ◽  
Hong Hua ◽  
Lin Zhou ◽  
Hailin Zhu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Quantum Dots ◽  
Surface Chemistry ◽  
Graphene Quantum Dots ◽  
Sensitive Detection ◽  
Monolayer Graphene ◽  
One Pot ◽  
Doped Graphene ◽  
One Step ◽  
The One

A facile strategy was developed for the one-step synthesis of S-GQDs with a monolayer-graphene crystal structure. The change of surface chemistry by S-doping resulted in selective and sensitive detection of Pb2+.

scholarly journals Trifluoroacetic Acid Hydroxylamine System as Organocatalyst Reagent in a One-Pot Salt Free Process for the Synthesis of Caprolactam and Amides of Industrial Interest

2021 ◽  
Author(s):  
F. Manente ◽  
L. Pietrobon ◽  
L. Ronchin ◽  
A. Vavasori
Keyword(s):  
Trifluoroacetic Acid ◽  
Room Temperature ◽  
Beckmann Rearrangement ◽  
One Pot ◽  
Free Process ◽  
Hydrogenation Reactions ◽  
One Step ◽  
The One ◽  
Industrial Relevance

AbstractIn this work we studied the reactivity of the Trifluoroacetic acid hydroxylamine system in the one step salt free synthesis of amides from ketones. A particular regards was paid to the caprolactam synthesis because of its industrial relevance. Synthesis, reactivity and characterization of the hydroxylamine trifluoroacetate is given. Fast oximation reaction of several ketones was gained at room temperature (1 h of reaction quantitative conversion for several ketones). In the same reactor, by raising the temperature at 383 K, the Beckmann rearrangement of the so obtained oximes is easily accomplished in the presence of three equivalent of TFA. The possibility of obtaining the trifluoroacetate of the hydroxylamine with a modified nitric acid hydrogenation reactions was verified, too. Reuse of solvent and trifluoroacetic acid is easily achieved by distillation. Graphical abstract Salt free one-pot caprolactam and amides process catalyzed by CF3COOH, in the presence of NH2OH TFA as the oximation agent.

Cross-linked enzyme aggregates (CLEA®s): stable and recyclable biocatalysts

2007 ◽  
Vol 35 (6) ◽  
pp. 1583-1587 ◽  
Author(s):  
R.A. Sheldon
Keyword(s):  
Mandelic Acid ◽  
Enantiomeric Purity ◽  
Galactose Oxidase ◽  
High Yield ◽  
One Pot ◽  
Nitrile Hydratases ◽  
Recyclable Catalysts ◽  
One Step ◽  
Enzyme Molecules ◽  
The One

The key to obtaining an optimum performance of an enzyme is often a question of devising an effective method for its immobilization. In the present review, we describe a novel, versatile and effective methodology for enzyme immobilization as CLEAs (cross-linked enzyme aggregates). The method is exquisitely simple (involving precipitation of the enzyme from aqueous buffer followed by cross-linking of the resulting physical aggregates of enzyme molecules) and amenable to rapid optimization. We have shown it to be applicable to a wide variety of enzymes, including, in addition to a wide variety of hydrolases, lyases, e.g. nitrile hydratases and oxynitrilases, and oxidoreductases such as laccase and galactose oxidase. CLEAs are stable, recyclable catalysts exhibiting high catalyst productivities. Because the methodology is essentially a combination of purification and immobilization into one step, the enzyme does not need to be of high purity. The technique is also applicable to the preparation of combi-CLEAs, containing two or more enzymes, for use in one-pot, multistep syntheses, e.g. an oxynitrilase/nitrilase combi-CLEA for the one-pot conversion of benzaldehyde into (S)-mandelic acid, in high yield and enantiomeric purity.

scholarly journals Synthesis of Poly(Trimethylene Carbonate) from Amine Group Initiation: Role of Urethane Bonds in the Crystallinity

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 280
Author(s):  
Thomas Brossier ◽  
Gael Volpi ◽  
Vincent Lapinte ◽  
Sebastien Blanquer
Keyword(s):  
Thermal Studies ◽  
Trimethylene Carbonate ◽  
X Ray Diffraction ◽  
One Pot ◽  
Free Process ◽  
One Step ◽  
The One ◽  
Natural Amino Acids ◽  
The Impact

Semi-crystalline poly(trimethylene carbonate) (PTMC) can be efficiently prepared by ring-opening polymerization (ROP) initiated by amine using various catalysts. More promising results were reached with the one-step process of stannous octanoate unlike the two-step one-pot reaction using TBD and MSA catalysts. The ROP-amine of TMC consists in a simple isocyanate free process to produce polycarbonate-urethanes, compatible with the large availability of amines ranging from mono- to multifunctional until natural amino acids. ROP-amine of TMC leads to urethane bonds monitored by FTIR spectroscopy. The relationship between the nature of amines and the crystallinity of PTMC was discussed through X-ray diffraction and thermal studies by DSC and TGA. The impact of the crystallinity was also demonstrated on the mechanical properties of semi-crystalline PTMC in comparison to amorphous PTMC, synthesized by ROP initiated by alcohol. The semi-crystalline PTMC synthesized by ROP-amine opens many perspectives.

Transition-metal-free cross-coupling of thioethers with aryl(cyano)iodonium triflates: a facile and efficient method for the one-pot synthesis of thiocyanates

2015 ◽  
Vol 51 (33) ◽  
pp. 7180-7183 ◽  
Author(s):  
Dan Zhu ◽  
Denghu Chang ◽  
Lei Shi
Keyword(s):  
Transition Metal ◽  
Efficient Method ◽  
Bond Cleavage ◽  
Cross Coupling ◽  
One Pot ◽  
Metal Free ◽  
One Pot Synthesis ◽  
One Step ◽  
The One

A novel transition-metal-free method for the one-step synthesis of thiocyanates via the C–S bond cleavage of readily available thioethers was developed.

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