Tag: 213.2966

Radical Charge Population and Energy: Critical Role in Redox Potential and Cycling Life of Piperidine Nitroxyl Radical Cathodes in Aqueous Zinc Hybrid Flow Batteries was written by Fan, Hao;Zhang, Jiahui;Ravivarma, Mahalingam;Li, Hongbin;Hu, Bo;Lei, Jiafeng;Feng, Yangyang;Xiong, Shizhao;He, Cheng;Gong, Jianying;Gao, Tieyu;Song, Jiangxuan. And the article was included in ACS Applied Materials & Interfaces in 2020.COA of Formula: C11H21N2O2 This article mentions the following:

Redox-active 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) derivatives have recently been investigated to expand the choice of catholyte for aqueous flow batteries (AFBs). However, the effects of substituent R in 4-position on redox potential and corresponding capacity fading mechanism are still unclear. Here, we conduct comparative studies of four R-TEMPO with R = -OH, -NH₂, -COOH, and -NHCOCH₃ in zinc hybrid AFBs. Exptl. and theor. analyses reveal that low-radical head charge population sum and radical energy, depending on R in 4-position, play a critical role in enhancing redox potential and cycling life of R-TEMPO. The electronic effect brought along by N-acetyl could redistribute the charge and lower systematic energy, making the ring-opening joint sturdy and therefore suppress the side reactions. Accordingly, the 4-NHCOCH₃-TEMPO/Zn battery achieves a high capacity retention of >99.65%/day and an open-circuit voltage of 1.71 V. Our findings on the effects of substituent are greatly anticipated to boost the high-energy d., long-life, and eco-friendly TEMPO-based AFBs. In the experiment, the researchers used many compounds, for example, 4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5COA of Formula: C11H21N2O2).

4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5) belongs to piperidine derivatives.Piperidine is a key saturated heterocyclic scaffold found in several of the top-selling small molecule pharmaceuticals and natural alkaloids, with a diverse range of biological activities. Industrially, piperidine is produced by the hydrogenation of pyridine, usually over a molybdenum disulfide catalyst. Pyridine can also be reduced to piperidine via a modified Birch reduction using sodium in ethanol.COA of Formula: C11H21N2O2

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Ionic Liquid Stabilized 2,2,6,6-Tetramethylpiperidine 1-Oxyl Catalysis for Alcohol Oxidation was written by Li, Min;Klunder, Kevin;Blumenthal, Emmy;Prater, Matthew B.;Lee, Jack;Matthiesen, John E.;Minteer, Shelley D.. And the article was included in ACS Sustainable Chemistry & Engineering in 2020.Application of 14691-89-5 This article mentions the following:

N-Oxyl reagents, particularly 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO), have been extensively used for alc. oxidations While TEMPO-mediated oxidations are kinetically and thermodynamically favorable in high-pH electrolytes, base-induced degradation often results in significant loss of catalytic activity. Herein, we demonstrate enhanced alk. stability of a TEMPO derivative in ionic liquids (ILs). By incorporating TEMPO in an imidazole-anchored IL, no loss of current was observed at pH 10.0 after 2.0 h during the oxidation of butanol and glycerol, while TEMPO in polycaprolactone (PCL), a patternable binder material, degraded 58.5% and 67.1%, resp. The stability enhancement was further demonstrated by analyzing the conversion of glycerol in an 800渭L electrochem. cell using bulk chem. anal. techniques. Successive cycles of glycerol oxidation indicated 14-fold stability enhancement by applying IL in a TEMPO electrode composite in comparison to PCL. The strategy demonstrated here provides an opportunity to prepare catalytic systems with enhanced stability. Further, this method provides the ability to convert what are typically homogeneous catalysts to heterogeneous systems. To improve the stability of TEMPO, used to mediate oxidations for biorenewables, an ionic liquid based catalyst was developed. In the experiment, the researchers used many compounds, for example, 4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5Application of 14691-89-5).

4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5) belongs to piperidine derivatives. The piperidine moiety constitutes an important building block for the synthesis of a variety of bioactive natural products, alkaloids and other drugs. Piperidine derivatives are being utilized in different ways as anticancer, antiviral, antimalarial, antimicrobial, antifungal, antihypertension, analgesic, anti-inflammatory, anti-Alzheimer, antipsychotic and/or anticoagulant agents.Application of 14691-89-5

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Molecular Orientation and Dynamics of a Derivative of 2,2,6,6-Tetramethyl-1-Piperidinyloxyl Radical with a Large Substituent Group Dispersed in 1D-Nanochannels of 2,4,6-Tris(4-Chlorophenoxy)-1,3,5-Triazine Crystal was written by Kobayashi, Hirokazu;Odanaka, Yuki. And the article was included in Applied Magnetic Resonance in 2020.Reference of 14691-89-5 This article mentions the following:

The mol. orientation and dynamics were examined for 4-acetamido-2,2,6,6-tetramethyl-1-piperidinyloxyl (4-acetamido-TEMPO) radicals, which have a larger substituent group than many other TEMPO radicals, dispersed in the one-dimensional (1D) nanochannel of 2,4,6-tris(4-chlorophenoxy)-1,3,5-triazine (CLPOT) with 4-substituted-2,2,6,6-tetramethylpiperidine (R-TEMP; R=OH or H). When TEMPOH (R=OH) was used as a spacer for dispersion in the CLPOT nanochannels, the mol. orientation of 4-acetamido-TEMPO in the CLPOT nanochannels was similar to that of other previously reported 4-substituted-TEMPO (4-X-TEMPO; X=OH, =O or OCH₃) radicals. However, the activation energy for the rotational diffusion of 4-acetamido-TEMPO in the CLPOT nanochannels, estimated to be 11 kJ mol^-1, was larger than that of other 4-X-TEMPO mols. (6-8 kJ mol^-1). These results indicate that the mol. dynamics of 4-X-TEMPO in the CLPOT nanochannels can be controlled by the selection of a larger substituent X at the 4-position in 4-X-TEMPO (in this study, X=NHCOCH₃), and also suggest an important concept for the design of new organic magnets. In the experiment, the researchers used many compounds, for example, 4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5Reference of 14691-89-5).

4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5) belongs to piperidine derivatives. The piperidine structural motif is present in numerous natural alkaloids. These include piperine, which gives black pepper its spicy taste. Piperidine derivatives are being utilized in different ways as anticancer, antiviral, antimalarial, antimicrobial, antifungal, antihypertension, analgesic, anti-inflammatory, anti-Alzheimer, antipsychotic and/or anticoagulant agents.Reference of 14691-89-5

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Cellulose dissolution in aqueous NaOH-ZnO: effect of pulp pretreatment at macro and molecular levels was written by Vaisanen, Saija;Kosonen, Harri;Ristolainen, Matti;Vuorinen, Tapani. And the article was included in Cellulose (Dordrecht, Netherlands) in 2021.Synthetic Route of C11H21N2O2 This article mentions the following:

This paper discusses the effect of hydrolytic pretreatments on pulp dissolution in the aqueous NaOH-ZnO solvent system. Eight samples were studied. They consisted of a never-dried softwood kraft pulp that was hydrolyzed under seven different conditions as well as the pulp without hydrolysis as a reference The dissolution of the pulps was evaluated both at the macro level as well as at the mol. level based on their reactivity with 4-acetamido-2,2,6,6-tetramethylpiperidine-1-oxo-piperidium (4-AcNH-TEMPO+). The fiber properties (i.e. the extent of fibrillation, amount of fines and fiber width, coarseness, and length) as well as the chem. composition (hemicellulose and cellulose contents) and the viscosity of the pulps was investigated. The results show that hydrolysis at medium consistency (10%) was successful in increasing the solubility of cellulose. Hydrolysis at high consistency (50%), on the other hand, increased the solubility only to some extent. With extended treatment time the fibers formed aggregates and their dissolution became poor. This phenomenon could be overcome by mech. refining the fibers after the hydrolysis. Moreover, comparison of the viscosity of the pulp over the degree of oxidation revealed that the viscosity needed to decrease below ca. 400 mL/g in order for the outer layers of the fibers to dissolve. Finally, when pulps with similar viscosities where compared against each other, the ones with the higher glucomannan contents formed gels over time. In the experiment, the researchers used many compounds, for example, 4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5Synthetic Route of C11H21N2O2).

4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5) belongs to piperidine derivatives.Piperidine is a key saturated heterocyclic scaffold found in several of the top-selling small molecule pharmaceuticals and natural alkaloids, with a diverse range of biological activities. Piperidine derivatives bearing a masked aldehyde function in the 蔚-position are easily transformed into quinolizidine compounds through intramolecular reductive amination.Synthetic Route of C11H21N2O2

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem

Stabilities, Regeneration Pathways, and Electrocatalytic Properties of Nitroxyl Radicals for the Electrochemical Oxidation of 5-Hydroxymethylfurfural was written by Cardiel, Allison C.;Taitt, Brandon J.;Choi, Kyoung-Shin. And the article was included in ACS Sustainable Chemistry & Engineering in 2019.Recommanded Product: 14691-89-5 This article mentions the following:

2,5-Furandicarboxylic acid (FDCA) is a near-market monomer that has been identified as a viable biomass-derived replacement for petroleum-derived terephthalic acid in the synthesis of polyethylene terephthalate (PET). FDCA can be produced from the oxidation of 5-hydroxymethylfurfural (HMF), which is a versatile biomass intermediate produced from the dehydration of C-6 monosaccharides obtained from cellulosic biomass. In this study, we comparatively investigated the use of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and 4-acetamido-TEMPO (ACT) for electrochem. HMF oxidation to FDCA. The distinct advantage of TEMPO- and ACT-mediated electrochem. oxidation of HMF is that they can efficiently achieve HMF oxidation in mildly basic conditions (pH 9-10), while other heterogeneous catalysts typically require the use of more basic media. Since HMF oxidation in a strongly basic condition increases the chance to form humins, which are difficult to sep. from FDCA and decrease the com. viability of FDCA and FDCA-derived products, TEMPO- and ACT-mediated HMF oxidation may offer a critical advantage for producing com.-grade FDCA. In this study, the stabilities, electrochem. properties, and electrocatalytic performances of TEMPO and ACT, which has been identified as a less expensive alternative to TEMPO, were comparatively examined for electrochem. HMF oxidation Through investigating the effect of pH, applied potential, and ratio of nitroxyl radical to HMF in solution on HMF oxidation, two different regeneration pathways of TEMPO and ACT in the catalytic cycle and the factors that affect their regeneration pathways were identified. The stability and catalytic activity of TEMPO and ACT for electrochem. HMF oxidation at an elevated temperature were also studied. On the basis of this investigation, optimal electrochem. conditions to efficiently oxidize a concentrated HMF solution (100 mM), which is relevant to large-scale electrochem. FDCA production, were identified. In the experiment, the researchers used many compounds, for example, 4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5Recommanded Product: 14691-89-5).

4-Acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (cas: 14691-89-5) belongs to piperidine derivatives. Piperidine has a role as a reagent, a protic solvent, a base, a catalyst, a plant metabolite, a human metabolite and a non-polar solvent. Piperidine derivatives bearing a masked aldehyde function in the 蔚-position are easily transformed into quinolizidine compounds through intramolecular reductive amination.Recommanded Product: 14691-89-5

Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem