scholarly journals Si nanocrystal solution with stability for one year

RSC Advances ◽  
2018 ◽  
Vol 8 (72) ◽  
pp. 41299-41307 ◽  
Author(s):  
Daisuke Kajiya ◽  
Ken-ichi Saitow
Keyword(s):  
One Pot ◽  
Si Nanocrystal ◽  
One Step ◽  
One Year

A stable nanocrystal for one year without aggregation in a liquid is synthesized by one-step, one-pot, and one-hour process.

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 One-Year Clinical Evaluation of the Bonding Effectiveness of a One-Step, Self-Etch Adhesive in Noncarious Cervical Lesion Therapy

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Babacar Faye ◽  
Mouhamed Sarr ◽  
Khaly Bane ◽  
Adjaratou Wakha Aidara ◽  
Seydina Ousmane Niang ◽  
...  
Keyword(s):  
Clinical Performance ◽  
Retention Rate ◽  
Recall Rate ◽  
Acid Etching ◽  
Significant Difference ◽  
Usphs Criteria ◽  
One Step ◽  
One Year ◽  
The One ◽  
Self Etch

This study evaluated the one-year clinical performance of a one-step, self-etch adhesive (Optibond All-in-One, Kerr, CA, USA) combined with a composite (Herculite XRV Ultra, Kerr Hawe, CA, USA) to restore NCCLs with or without prior acid etching. Restorations performed by the same practitioner were evaluated at baseline and after 3, 6, and 12 months using modified USPHS criteria. At 6 months, the recall rate was 100%. The retention rate was 84.2% for restorations with prior acid etching, but statistically significant differences were observed between baseline and 6 months. Without acid etching, the retention rate was 77%, and no statistically significant difference was noted between 3 and 6 months. Marginal integrity (93.7% with and 87.7% without acid etching) and discoloration (95.3% with and 92.9% without acid etching) were scored as Alpha or Bravo, with better results after acid etching. After one year, the recall rate was 58.06%. Loss of pulp vitality, postoperative sensitivity, or secondary caries were not observed. After one year retention rate was of 90.6% and 76.9% with and without acid conditioning. Optibond All-in-One performs at a satisfactory clinical performance level for restoration of NCCLs after 12 months especially after acid etching.

scholarly journals Microwave-Assisted Vacuum Synthesis of TiO2 Nanocrystalline Powders in One-Pot, One-Step Procedure

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 149
Author(s):  
Enrico Paradisi ◽  
Roberto Rosa ◽  
Giovanni Baldi ◽  
Valentina Dami ◽  
Andrea Cioni ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Reaction Medium ◽  
Process Intensification ◽  
Nanocrystalline Powders ◽  
Fast Heating ◽  
One Pot ◽  
Nanoparticle Suspension ◽  
Step Procedure ◽  
One Step

A new method for fast and simple synthesis of crystalline TiO2 nanoparticles with photocatalytic activity was developed by carrying out a classic sol–gel reaction directly under vacuum. The use of microwaves for fast heating of the reaction medium further reduces synthesis times. When the solvent is completely removed by vacuum, the product is obtained in the form of a powder that can be easily redispersed in water to yield a stable nanoparticle suspension, exhibiting a comparable photocatalytic activity with respect to a commercial product. The present methodology can, therefore, be considered a process intensification procedure for the production of nanotitania.

scholarly journals Expedient Microwave-Assisted Synthesis of Bis(n)-lophine Analogues as Selective Butyrylcholinesterase Inhibitors: Cytotoxicity Evaluation and Molecular Modelling

2021 ◽  
Author(s):  
Viktor Câmara ◽  
Ana Julia Soares ◽  
Brunella Biscussi ◽  
Ana Paula Murray ◽  
Isabella Guedes ◽  
...  
Keyword(s):  
Ammonium Acetate ◽  
Docking Studies ◽  
Microwave Assisted Synthesis ◽  
One Pot ◽  
Cytotoxic Effects ◽  
One Step ◽  
The Brain ◽  
Micromolar Range ◽  
Potent Inhibitory Activity

In the brain of patients with chronic Alzheimer’s disease (AD), the butyrylcholinesterase (BuChE) levels rise while the acetylcholinesterase (AChE) levels decrease. Therefore, development of new selective BuChE inhibitors is of vital importance. Here we present a series of bis(n)‑lophine analogues, where two lophine derivatives are connected by a methylene chain. The bis(n)-lophine analogues were synthesized through one-pot four component reaction between pyridinecarboxaldehydes, 1,n-alkanediamines, benzil, and ammonium acetate. The reactions were performed in a microwave reactor in one step for symmetrical bis(n)-lophines, and in two steps for unsymmetrical bis(n)-lophines. The compounds are strongly selective to BuChE, since none of them inhibit AChE. All the compounds, except 7a, 7b and 7c, displayed potent inhibitory activity against BuChE at a micromolar and sub-micromolar range (half maximal inhibitory concentration (IC50) 32.25-0.03 μM). The enzyme kinetic and docking studies suggests that the inhibitor act as a dual binding site inhibitor, binding into the bottom of the gorge and in the peripheral anionic site (PAS) of BuChE cavity. Furthermore, in vitro studies showed that compounds 5b and 12b had no cytotoxic effects in kidney Vero, hepatic HepG2 and C6 astroglial cell lines.

scholarly journals Green resins from renewable resources

2021 ◽  
Author(s):  
Justin J. Kosalka
Keyword(s):  
Phenolic Compounds ◽  
High Resolution Mass Spectrometry ◽  
Dicarboxylic Acids ◽  
13C Nmr Spectroscopy ◽  
One Pot ◽  
1H And 13C Nmr ◽  
X Ray Crystallography ◽  
Naturally Occurring ◽  
One Step ◽  
Acid Catalyzed

This work was aimed at exploring bio-based materials for the purpose of toner production on an industrial scale. Polyester and polyether based resins were prepared in good yields from naturally occurring phenolic compounds with desired thermal and physical properties. Phenols with varying functionality such as guaiacol, eugenol and vanillin along with two synthetically produced phenolic compounds modelling the β-O-4 linkage found in softwood lignins were explored as suitable precursors to synthetic, "green", resins. Phenols were transformed into diols using glycerine carbonate and a base catalyzed reaction. Diols were then polymerized with dicarboxylic acids in an acid catalyzed, transesterfication, reaction. A novel, bio-based polyether was synthesized in one pot, one step polymerization using vanillin. Thermal properties ((Tg) and (Ts) of resulting resins were evaluated. Resulting compounds and polymers were characterized using 1H and 13C NMR spectroscopy, high resolution mass spectrometry, elemental analysis, X-ray crystallography, DSC and GPC.

scholarly journals Three-component synthesis of highly functionalized aziridines containing a peptide side chain and their one-step transformation into β-functionalized α-ketoamides

2016 ◽  
Vol 12 ◽  
pp. 1772-1777 ◽  
Author(s):  
Lena Huck ◽  
Juan F González ◽  
Elena de la Cuesta ◽  
J Carlos Menéndez
Keyword(s):  
Single Step ◽  
Side Chain ◽  
One Pot ◽  
Aziridine Ring ◽  
Component Process ◽  
Mild Conditions ◽  
One Step

A sequential three-component process is described, starting from 3-arylmethylene-2,5-piperazinediones and involving a one-pot sequence of reactions achieving regioselective opening of the 2,5-diketopiperazine ring and diastereoselective generation of an aziridine ring. This method allows the preparation of N-unprotected, trisubstituted aziridines bearing a peptide side chain under mild conditions. Their transformation into β-trifluoroacetamido-α-ketoamide and α,β-diketoamide frameworks was also achieved in a single step.

Synthesis of colloidal MnO2with a sheet-like structure by one-pot plasma discharge in permanganate aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (4) ◽  
pp. 2826-2834 ◽  
Author(s):  
Hyemin Kim ◽  
Anyarat Watthanaphanit ◽  
Nagahiro Saito
Keyword(s):  
Aqueous Solution ◽  
Plasma Discharge ◽  
Plasma Process ◽  
One Pot ◽  
One Step

Stable colloidal MnO2—consisting of MnO2with a sheet-like structure—was synthesized by solution plasma process (SPP) in one-step and without utilizing any dispersants or stabilizers.

Recent advances in cyclohydrocarbonylation reactions

2005 ◽  
Vol 83 (6-7) ◽  
pp. 681-692 ◽  
Author(s):  
Wen-Hua Chiou ◽  
Seung-Yub Lee ◽  
Iwao Ojima
Keyword(s):  
Transition Metal Complexes ◽  
Relevant Literature ◽  
Cascade Process ◽  
One Pot ◽  
Polycyclic Compounds ◽  
Carbon Nucleophiles ◽  
Recent Advances ◽  
Carbocyclic Compounds ◽  
Cascade Processes ◽  
One Step

This article describes recent advances in the cyclohydrocarbonylation reactions catalyzed by transition-metal complexes and their applications in organic synthesis as a review covering the relevant literature up to the middle of 2004. The reactions are categorized into four types, i.e., intramolecular amidocarbonylation reactions, intramolecular aminocarbonylation reactions, cyclohydrocarbonylation reactions involving carbon–nucleophiles, and other cyclohydrocarbonylation reactions. Cyclohydrocarbonylation reactions provide efficient routes to various monocyclic, bicyclic, and polycyclic compounds as a one-step cascade process or a one-pot process. Reaction mechanisms for these cascade processes are discussed as needed for clarification. The heterocyclic and carbocyclic compounds, thus obtained, can be further transformed to specific targets. Examples of such applications are also discussed.Key words: catalysis, cyclohydrocarbonylation, hydroformylation, amidocarbonylation, cyclization, regioselectivity, aldehydes, regioselective, cascade, heterocycles, rhodium.

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