Author: tianli

In an article, author is Yang, Yunlian, once mentioned the application of 870-72-4, Category: alcohols-buliding-blocks, Name is Hydroxymethanesulfonic Acid Sodium Salt, molecular formula is CH3NaO4S, molecular weight is 134.0869, MDL number is MFCD00044664, category is alcohols-buliding-blocks. Now introduce a scientific discovery about this category.

Engineering the surface of cuprous oxide via surface coordination for efficient catalysis on aerobic oxidation of benzylic alcohols under ambient conditions

The surface organometallic chemistry or surface coordination is considered as an important tool for modifying the surface properties and electronic structure of metal centres to achieve enhancement in catalysis. In this piece of work, we report how cuprous oxide (Cu2O) was turned into an efficient catalyst alongside with 2,2,6,6-tetra-methylpiperidine-1-oxyl (TEMPO) and N-methylimidazole (NMI) for catalytic aerobic oxidation of benzylic alcohols into aldehydes under ambient conditions through surface coordination. The coordination not only enhanced the capability of O-2-activation via the ligation of NMI to the metal sites, but also the surface structure was engineered in such a way that a vacancy was created for O-2-binding, one of the key steps as revealed by DFT calculations. Both experimental and theoretical results suggested that the coordination to the metal sites at the surface by NMI activated cuprous oxide via breaking up its oxo bridge at the surface to form hydroxyl group to allow O-2-binding, and increased also the electron density on the metal site to enhance its capability of O-2 activation. A plausible mechanism was proposed by using a variety of spectroscopic and electrochemical techniques as well as DFT calculations.

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Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels. 42822-86-6, Name is 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, molecular formula is C10H20O2. In an article, author is Padmanaban, Sudakar,once mentioned of 42822-86-6, Recommanded Product: 42822-86-6.

Chemoselective hydrogenation of alpha,beta-unsaturated carbonyl compounds using a recyclable Ru catalyst embedded on a bisphosphine based POP

Selective hydrogenation of the carbonyl functional group of alpha,beta-unsaturated carbonyl compounds affords industrially important allylic alcohols. However, achieving the selective reduction of the carbonyl group in the presence of the activated olefinic group is challenging. Therefore, the development of a highly chemoselective, efficient, and recyclable catalyst for this transformation is greatly desirable from the industrial and environmental viewpoints. In this study, a Ru-immobilized bisphosphine-based porous organic polymer (Ru@PP-POP) was used as an efficient heterogeneous catalyst for chemoselective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol with high chemoselectivity (98%) and excellent recyclability. To the best of our knowledge, the catalyst, Ru@PP-POP showed a high turnover number (970) and a high turnover frequency (240h(1)) which is the best activity obtained using a phosphine based heterogeneous Ru-catalyst in this transformation. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

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Reference of 4461-39-6, Catalysts allow a reaction to proceed via a pathway that has a lower activation energy than the uncatalyzed reaction. 4461-39-6, Name is N-(2-Hydroxyethyl)-1,3-propanediamine, SMILES is NCCCNCCO, belongs to alcohols-buliding-blocks compound. In a article, author is Khvalbota, Liudmyla, introduce new discover of the category.

Enantiomer composition of chiral compounds present in traditional Slovak Tokaj wines

In the presented study volatile organic compounds (VOC) profiles of the most valuable products from Slovak Tokaj wine region were characterized using SPME-GC-MS. Identified volatile organic compounds in studied samples of Tokaj selection wines and Tokaj essences belonged to esters, terpenes, higher alcohols, volatile acids, lactones and aldehydes. From identified VOC, chiral compounds were selected, and their enantiomers were separated by heart-cut two-dimensional GC system. Enantiomer separation was optimized, and this advanced method was applied to determine enantiomeric ratios (ER) of studied compounds in 53 traditional botrytized Tokaj wines. Terpenic compounds linalool and limonene were present in ER resembling the racemic mixture, hotrienol expressed the slight dominancy of S-enantiomer (51-82 %) and S-alpha-terpineol varied from 47 to 70 %. Moreover, linalool and limonene were present only in wines of younger vintages. ER of 2,3-butanediol has shown the predominance of 2R,3R-enantiomer in all samples even though reached also values that were not usual for common white wines (55-100 %). Whiskey lactones were identified in all wines aged in oak barrels and exclusive presence of (4S,5S)-cisand (4S,5R)-transenantiomers was confirmed.

Reference of 4461-39-6, Consequently, the presence of a catalyst will permit a system to reach equilibrium more quickly, but it has no effect on the position of the equilibrium as reflected in the value of its equilibrium constant.I hope my blog about 4461-39-6 is helpful to your research.

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Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Schripp, Tobias, once mentioned the application of 873-76-7, Name is (4-Chlorophenyl)methanol, molecular formula is C7H7ClO, molecular weight is 142.58, MDL number is MFCD00004652, category is alcohols-buliding-blocks. Now introduce a scientific discovery about this category, Computed Properties of https://www.ambeed.com/products/873-76-7.html.

Technical application of a ternary alternative jet fuel blend – Chemical characterization and impact on jet engine particle emission

The use of alternative fuels is an essential element in future aviation. There are currently different approaches with regard to fuel production processes and feedstock materials. This requires flexible handling of available fuel quantities. The production of fuel mixtures (blends) is inevitable for an effective usage of commercially available fuel components. Within the framework of the project DEMO-SPK approx. 600 t of a ternary mixture (multiblend) of alternative jet fuels was produced and used in a real airport infrastructure at the airport Leipzig/Halle. Production and application were accompanied by extensive R&D activities to show that on-spec, semi-synthetic multiblends can be produced from several different synthetic fuels. One important aspect is the emission of soot particles from aircraft engines. The Multiblend Jet A-1 has been analyzed in a flow reactor setup regarding the formation of soot precursor compounds in comparison to a reference Jet A-1. The experiment revealed a lower formation of relevant soot precursors which also corresponds to the higher hydrogen content of the Multiblend Jet A-1 compared to the reference fuel. The lower soot formation in a real aircraft engine has been proven during ground runs of an A300-600 aircraft with PW4158 engines. The Multiblend Jet A-1 showed lower particle number and particle mass emission than the reference fuel. The difference to the reference fuel decreased with increasing power settings. In summary, the emission of particle mass is reduced by similar to 29 % and the number of emitted particles is reduced by similar to 37 % if the ICAO landing-and-take-off cycle is used for evaluation.

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Chemistry is an experimental science, Category: alcohols-buliding-blocks, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 16545-68-9, Name is Cyclopropanol, molecular formula is C3H6O, belongs to alcohols-buliding-blocks compound. In a document, author is Kable, Julie A..

Alterations in Insulin Levels in Adults with Prenatal Alcohol Exposure

Objective Evidence suggests that prenatal alcohol exposure (PAE) may adversely impact insulin production and signaling but there is limited information on the range of these effects and their future health consequences. Method A prospective cohort of predominantly African-American individuals identified while in utero and followed into adulthood were used to evaluate differences in various indicators of diabetes, including fasting plasma glucose, hemoglobin A1c (HbA1c), and insulin levels. The homeostatic model assessment of insulin resistance (HOMA-IR) was also computed. Body mass index (BMI) was calculated and normal defined as < 25 kg/m(2). Participants were categorized as having PAE (n = 39) if their mothers drank at least 1 ounce of absolute alcohol per week or more during the 1(st) trimester of pregnancy and as Controls (n = 22) if their mothers reported abstaining from alcohol consumption during pregnancy. Results Mean age of the sample was 36.0 +/- 1.5 years. Indices of glucose metabolism, including fasting plasma glucose and hemoglobin A1c levels, did not vary by group status but insulin levels and HOMA-IR values varied by group status and BMI level. PAE individuals with a normal BMI had lower insulin levels than Controls. However, in PAE subjects, there was a steeper increase in insulin levels relative to their BMI than in Control subjects. A cluster of 5 PAE cases had low levels of insulin and 4 of the 5 had severe cognitive impairment. Conclusions The bidirectional effects on insulin level and insulin resistance associated with PAE may indicate differential rates of diabetes disease impact or differential PAE impact in the brain and peripheral areas involved in insulin production and signaling. These alterations may contribute to the metabolic disease risk associated with PAE. Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 16545-68-9, in my other articles. Category: alcohols-buliding-blocks.

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13325-10-5, Name is 4-Aminobutan-1-ol, molecular formula is C4H11NO, Recommanded Product: 4-Aminobutan-1-ol, belongs to alcohols-buliding-blocks compound, is a common compound. In a patnet, author is Wei, Jiangping, once mentioned the new application about 13325-10-5.

Blood-brain barrier integrity is the primary target of alcohol abuse

The effects of long-term alcohol consumptions on cognitive function remain elusive with contradictory results. Whilst it is widely accepted that long-term intoxication can cause cognitive impairment, moderate drinking can improve cognitive function. In reality, many older people and those with chronic medical conditions are long-term alcohol consumers in Asian countries. Our previous studies have suggested that long-term alcohol consumption can damage blood-brain barrier (BBB) integrity and aggravate cognitive deficit in APPswe/PS1De9 mice, but little is known about the underlying mechanisms, especially whether this consumption can cause cognitive decline via aggravating BBB damage in people who are exposed to the risk factors for cognitive disorders such as aging or inflammation. These questions were addressed in this study. The mouse models of cognitive deficit induced by D-galactose or lipopolysaccharide, the important risk conditions in human on cognitive function, were used to evaluate the effects of long-term alcohol consumption on the BBB integrity. After alcohol administration for 30 days in these models the BBB integrity was significantly destroyed with remarkably increased permeability and down-regulated protein expression of zonula occludens-1, VE-cadherin, occludin, low-density lipoprotein receptor-related protein-1, receptor for advanced glycation end products, major facilitator superfamily domain-containing protein-2a and aquaporin-4, which is the most closely related with the structure and function of BBB integrity. Meanwhile, the level of oxidative stress in D-galactose mice or inflammatory factors in cortex and serum in lipopolysaccharide mice, which might be involved in the cognitive dysfunctions, was significantly amplified. Furthermore, the impaired memory and hippocampal neuron damage induced by D-galactose and lipopolysaccharide were concurrently aggravated. Collectively, our study provided novel and compelling evidence that the structural and functional proteins for BBB integrity may be the primary targets for the detrimental effects of alcohol abuse that lead to cognitive dysfunction and neurological deficits in high risk populations.

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Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Ramadoss, Govindarajan, once mentioned the application of 148043-73-6, Name is 4,4,5,5,5-Pentafluoropentan-1-ol, molecular formula is C5H7F5O, molecular weight is 178.1, MDL number is MFCD00153224, category is alcohols-buliding-blocks. Now introduce a scientific discovery about this category, Category: alcohols-buliding-blocks.

Mesoporous ferromagnetic manganese ferrite nanoparticles for enhanced visible light mineralization of azoic dye into nontoxic by-products

In this study, a one pot facile synthesis of ferromagnetic manganese ferrite nanoparticles (MnFe2O4) was carried out using chemical co-precipitation method for mineralization of azo dye (Congo red (CR)) in aqueous solution under visible light irradiation. The synthesized MnFe2O4 nanoparticles were highly crystalline and showed face-centred cubic (FCC) structure with average particle size of 58 +/- 4 nm. The BET analysis of the MnFe2O4 nanoparticles revealed the mesoporous distribution of material with high surface area can provide large electro active sites and short diffusion paths for the transport of ions which plays a vital role in the photocatalytic degradation of CR. The point of zero charge (pHPZC) was observed to be 6.7 indicating favourable condition for materialanionic dye interaction. The XPS studies revealed that the large amounts of oxygen vacancies were produced due to the defects in the lattice oxygen. The MnFe2O4 nanoparticlesmineralised 98.3 +/- 0.2% of 50mg/L CRwithin 30 min when tested in photocatalytic reactor under 565 nm. The particles were recoverable under the influence of an external magnet after the photocatalytic reaction and were reusable. The recovered nanoparticles showed 96% of CR degradation efficiency even after five cycles of reuse. The by-product analysis with GC-MS indicated mineralization of CR into simple alcohols and acids. The aqueous solution containing mineralised CR was nontoxic to Trigonella foenumgraecum and Vignamungo seeds and favoured increased germination, plumule and radicle length when compared to untreated CR. (C) 2020 Elsevier B.V. All rights reserved.

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The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 770-71-8, Name is Adamantan-1-ylmethanol, SMILES is OCC12CC3CC(C2)CC(C3)C1, in an article , author is Ray, Ritwika, once mentioned of 770-71-8, Quality Control of Adamantan-1-ylmethanol.

Oxalohydrazide Ligands for Copper-Catalyzed C-O Coupling Reactions with High Turnover Numbers

Here, we report a class of ligands based on oxalohydrazide cores and N-amino pyrrole and N-amino indole units that generates long-lived copper catalysts for couplings that form the C-O bonds in biaryl ethers. These Cu-catalyzed coupling of phenols with aryl bromides occurred with turnovers up to 8000, a value which is nearly two orders of magnitude higher than those of prior couplings to form biaryl ethers and nearly an order of magnitude higher than those of any prior copper-catalyzed coupling of aryl bromides and chlorides. This ligand also led to copper systems that catalyze the coupling of aryl chlorides with phenols and the coupling of aryl bromides and iodides with primary benzylic and aliphatic alcohols. A wide variety of functional groups including nitriles, halides, ethers, ketones, amines, esters, amides, vinylarenes, alcohols and boronic acid esters were tolerated, and reactions occurred with aryl bromides in pharmaceutically related structures.

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A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Computed Properties of https://www.ambeed.com/products/616-29-5.html, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 616-29-5, Name is 1,3-Diaminopropan-2-ol, molecular formula is C3H10N2O. In an article, author is Thompson, Andrew,once mentioned of 616-29-5.

Associations between occupation and heavy alcohol consumption in UK adults aged 40-69 years: a cross-sectional study using the UK Biobank

Background Understanding the relationship between occupation and alcohol use offers opportunities to provide health promotion programmes based on evidence of need. We aimed to determine associations between occupation and heavy alcohol consumption in working individuals aged 40-69 years. Methods A cross-sectional study was conducted using 100,817 people from the UK Biobank: 17,907 participants categorised as heavy drinkers, defined as > 35 units/week for women and > 50 units/week for men, and 82,910 drinking controls. Prevalence ratios (PRs) and 95% CIs were calculated for gender-specific heavy drinking in 353 occupations using Standard Occupational Classification, V.2000. Results Seventy-seven occupations were associated with level of alcohol consumption in drinkers. The largest ratios for heavy drinkers were observed for publicans and managers of licenced premises (PR = 2.81, 95%CI 2.52-3.14); industrial cleaning process occupations (PR = 2.09, 1.33-3.28); and plasterers (PR = 2.07, 1.66-2.59). Clergy (PR = 0.20, 0.13-0.32); physicists, geologists and meteorologists (PR = 0.40, 0.25-0.65); and medical practitioners (PR = 0.40, 0.32-0.50) were least likely to be heavy drinkers. There was evidence of gender-specific outcomes with the proportion of jobs associated with heavy drinking accounted for by skilled trade occupations being 0.44 for males and 0.05 for females, and 0.10 for males and 0.40 for females when considering managers and senior officials. Conclusions In the largest study of its kind, we found evidence for associations between a wider variety of occupations and the risk of heavy alcohol consumption than identified previously, particularly in females, although causality cannot be assumed. These results help determine which jobs and broader employment sectors may benefit most from prevention programmes.

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Chemistry can be defined as the study of matter and the changes it undergoes. You’ll sometimes hear it called the central science because it is the connection between physics and all the other sciences, starting with biology. 3068-00-6, Name is 1,2,4-Butanetriol, molecular formula is , belongs to alcohols-buliding-blocks compound. In a document, author is Lavadera, Marco Lubrano, COA of Formula: https://www.ambeed.com/products/3068-00-6.html.

Measurements of the laminar burning velocities and NO concentrations in neat and blended ethanol and n-heptane flames

Adiabatic laminar burning velocities and post-flame NO mole fractions for neat and blended ethanol and n-heptane premixed flames were experimentally determined using a heat flux burner and laser-induced fluorescence. The flames were stabilized at atmospheric pressure and at an initial temperature of 338 K, over equivalence ratios ranging from 0.6 to 1.5. These experiments are essential for the development, validation and optimization of chemical kinetic models, e.g. for the combustion of gasoline-ethanol fuel mixtures. It was observed that the addition of ethanol to n-heptane leads to an increase in laminar burning velocity that is not proportional to the ethanol content and to a decrease of NO formation. Such a NO reduction is due to the slightly lower flame temperatures of ethanol, which decrease the production of thermal-NO at 0.6 < Phi < 1.2, while under fuel-rich conditions this behavior is due to the lower concentrations of CH radicals, which decrease the production of prompt-NO. At Phi > 1.3, the lower NO formation through the prompt mechanism in the ethanol flames is partially offset by a lower rate of NO consumption through the reburning mechanism. New experimental results were compared with predictions of the POLIMI detailed chemical kinetic mechanism. An excellent agreement between measurements and simulated results was observed for the laminar burning velocities over the equivalence ratio range investigated; however, discrepancies were found for the NO mole fractions, especially under rich conditions. Further numerical analyses were performed to identify the main causes of the observed differences. Differences found at close-to stoichiometric conditions were attributed to an uncertainty in the thermal-NO mechanism. In addition, disagreement under rich conditions could be explained by the relative importance of reactions in hydrogen cyanide consumption pathways.

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