Day: April 7, 2022

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Deng, Qixin; Xie, Wei; Liu, Zechun; Huang, Yanjun; Zhang, Tinggui; Sun, Peijian; Wang, Xiaoyu; Yan, Quanping; Nie, Cong; Liu, Huimin; Xie, Jianping researched the compound: 2-Ethylpyrazine( cas:13925-00-3 ).Related Products of 13925-00-3.They published the article 《Correlations between TPM pH and acidic/alkaline component releases from mainstream cigarette smoke》 about this compound( cas:13925-00-3 ) in Yancao Keji. Keywords: TPM pH acidic alk component cigarette smoke. We’ll tell you more about this compound (cas:13925-00-3).

In order to investigate whether the pH of total particulate matter (TPM) can represent the acid-base balance of mainstream cigarette smoke, and to analyze the correlations between the TPM pH and the chem. components of mainstream cigarette smoke, a method for determining the TPM pH was developed. The correlations between the releases of the routine chem. components, plus 30 main acidic components, 40 main alk. components and ammonia in mainstream smoke and the TPM pH of cigarette samples made of different single grade tobacco leaves and com. cigarette samples were analyzed. The influences of adding acidic and alk. components to cigarettes on the TPM pH were investigated. The results showed that adding 1% (mass fraction) sodium chloride to isopropanol aqueous solution increased the differences of detected values of TPM pH among different samples and reduced the relative standard deviation of the measurement values. The correlations of the releases of routine components, the main acidic components, the main alk. components and ammonia in mainstream smoke with the TPM pH could not be verified on the two types of cigarette samples. The ratios of nicotine release to the total release of acidic components, the total release of carboxyl units or the total release of hydrogen ions in mainstream cigarette smoke were significantly correlated to the TPM pH, which could be verified on the different cigarette samples of the two types. The contributions of 2-furoic acid, formic acid, glycolic acid and lactic acid to the total release of hydrogen ions in mainstream cigarette smoke were relatively higher. Compared with the other acidic components in the smoke, the effects of these four acidic components on the TPM pH were greater at the same adding mass. The influence of adding ammonia on the TPM pH was stronger than that of nicotine.

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Recommanded Product: 931-40-8. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Organocatalytic carbon dioxide fixation to epoxides by perfluorinated 1,3,5-triols catalysts. Author is Sperandio, Celine; Rodriguez, Jean; Quintard, Adrien.

In order to improve epoxides I (R1 = Me, Ph, CH2Cl, etc; R2 = H; R1R2 = -(CH2)4-) conversion to carbonates II by fixation of CO2 a new type of (4R,8R)-1,1,1,2,2,3,3,9,9,10,10,11,11,11-tetradecafluoroundecane-4,6,8-triol were developed. These simple acyclic scaffolds of enhanced acidity are efficient for catalysis through selective H-bonding activation of the epoxide. In combination with TBAI as co-catalyst, this useful transformation is performed under only 1 atm of CO2 and between 30 to 80°C. Both the 1,3,5-triol motif and the perfluorinated side chains are crucial in order to observe this epoxide opening under such mild conditions. In addition, the stereochem. of the starting (2R)-2-phenyloxirane can efficiently be conserved during the (4R)-4-phenyl-1,3-dioxolan-2-one formation.

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Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, U.S. Gov’t, P.H.S., Journal of Medicinal Chemistry called Stereochemical studies on medicinal agents. 30. Investigation of 4-(3-hydroxyphenyl)-4-methylpipecolic acid as a conformationally restricted mimic of the tyrosyl residue of leucine-enkephalinamide, Author is Sugg, Elizabeth E.; Portoghese, Philip S., which mentions a compound: 10466-61-2, SMILESS is N[C@@H](CC(C)C)C(N)=O.[H]Cl, Molecular C6H15ClN2O, Recommanded Product: H-Leu-NH2.HCl.

The cis and trans forms of enkephalin analog I (R = H) (II) were prepared by coupling the resp. cis and trans forms of pipecolic acid III with H-Gly-Gly-Phe-Leu-NH2 by DCC/HOBt and debenzylating the resulting I (R = CH2Ph) by hydrogenolysis. N-Benzyl-4-piperidinone was treated with m-bromoanisole in the presence of BuLi to give piperidinol IV, which was dehydrated by p-MeC6H4SO3H in refluxing toluene to give tetrahydropyridine V. V was methylated by (MeO)2SO/BuLi to give 4-Me derivative VI, which was treated with HClO4/KCN to give cyanopiperidine VI, which was hydrolyzed by concentrated HCl to give cis- and trans-II. Despite spatial analogy between trans-II and leucine-enkephalinamide, trans-II possessed neither opioid agonist nor antagonist activity.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called 4-(Tetrazolylalkyl)piperidine-2-carboxylic acids. Potent and selective N-methyl-D-aspartic acid receptor antagonists with a short duration of action, published in 1991-01-31, which mentions a compound: 22468-26-4, Name is 4-Hydroxypicolinic acid, Molecular C6H5NO3, Product Details of 22468-26-4.

A series of trans- and cis-4-(tetrazolylalkyl)piperidine-2-carboxylic acids I (R = H, Me) and II (n = 1, R = H, Me; n = 2-4, R = H) as potent and selective N-methyl-D-aspartic acid (NMDA) receptor antagonists were prepared and evaluated in vitro in both receptor binding assays and in a cortical-wedge preparation to determine affinity, potency, and selectivity. The new amino acids were also evaluated in vivo for their ability to block NMDA-induced convulsions in neonatal rats and NMDA-induced lethality in mice. The most potent compound of this series was I (R = H). I (R = H) blocked both NMDA-induced convulsions in neonatal rats and NMDA-induced lethality in mice. This is the first example of an NMDA receptor antagonist that incorporates a tetrazole moiety as an ω-acid bioisostere. These amino acid antagonists are also unique from their phosphonic acid counterparts in that they have a shorter duration of action in vivo.

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Khmel’nitskii, Yu. L.; Martinek, K. published the article 《Enzymatic synthesis in biphasic water-organic systems. V. Optimization of preparative synthesis of a peptide》. Keywords: optimization peptide synthesis chymotrypsin catalyst; enzyme peptide synthesis biphasic system.They researched the compound: H-Leu-NH2.HCl( cas:10466-61-2 ).COA of Formula: C6H15ClN2O. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:10466-61-2) here.

α-Chymotrypsin-catalyzed coupling of Ac-Trp-OH with H-Leu-NH2-HCl in EtOAc-H2O were optimized. The product, Ac-Trp-Leu-NH2, was obtained in ∼100% yield under the following conditions: EtOAc/H2O volume ratio 50, aqueous phase pH 6-9, and initial reactant concentrations 3 × 10-9 M.

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Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 931-40-8, is researched, SMILESS is O=C1OCC(CO)O1, Molecular C4H6O4Journal, IOP Conference Series: Materials Science and Engineering called Investigation on the effect of ultrasonic-assisted transesterification for green synthesis of glycerol carbonate from crude glycerol, Author is Lo, P. K.; Leong, S. Y.; Tan, C. Y., the main research direction is investigation effect ultrasonic assisted transesterification green synthesis glycerol carbonate; crude glycerol.Safety of 4-(Hydroxymethyl)-1,3-dioxolan-2-one.

The present work demonstrates the utilization of ultrasonic-irradiation for synthesis of glycerol carbonate (GC) with direct use of crude glycerol (C.Gly) and di-Me carbonate (DMC). This transesterification reaction was catalyzed by calcium oxide (CaO) and the effect of ultrasonic-assisted transesterification reaction was studied. In order to verify the contents of C.Gly, the C.Gly obtained from biodiesel production plant was characterized and the results showed that C.Gly consists of 71.21%weight/weight glycerol, 16.01%weight/weight of moisture, 7.10%weight/weight of methanol, 2.76%weight/weight of ash, 3.60%weight/weight of soap and 10.02%weight/weight of matter organic non-glycerol (MONG). Subsequently, effects of reaction temperature, reaction time, molar ratios of reactants and catalyst loading on C.Gly conversion and GC yield have been investigated. The highest yield of GC (95.41%) was attained with 9 mol% of CaO catalyst loading, 3:1 molar ratio of (DMC:C.Gly) at 70°C for 90 min. The yield of GC was observed to rise with all the reaction parameters till the optimum conditions obtained. Moreover, the yield of GC obtained from ultrasonic-assisted was compared with the conventional-heating method done in the previous study. It was noticeable that the yield of GC obtained via ultrasonic-assisted was found to be 51.44% better than conventional-heating transesterification. In conclusion, the production of GC via ultrasonic-assisted transesterification shows better feasibility than that of the conventionalheating method.

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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 931-40-8, is researched, Molecular C4H6O4, about Efficient and simultaneous cleaner production of biodiesel and glycerol carbonate in solvent-free system via statistical optimization, the main research direction is biodiesel glycerol dimethyl methanol carbonate novozyme435.Category: chiral-catalyst.

A solvent-free co-production process for biodiesel and glycerol carbonate (GC) was developed based on enzyme (Novozyme 435). Glycerol obtained from transesterification reactions could be directly converted to GC. The reactions were optimized using the response surface methodol. (RSM) sep. The optimal factors, which are enzyme loading, molar ratio of di-Me carbonate to soybean oil, water content, and reaction temperature, were derived from the response optimizer. The results of optimization for biodiesel and GC production were re-analyzed by overlapping the contour plots of the factors. The following were the optima obtained: enzyme loading of 25 g/L, molar ratio of 15:1, water content of 0.082% (volume/volume), and reaction temperature of 59.65°C. When the co-production of biodiesel and GC was conducted using the optima, biodiesel and GC production were achieved with conversions of 97.6% and 95.5%, resp.

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Xu, Jiu Liang; Kim, Tae Jin; Kim, Jae-Kwang; Choi, Yongsoo published the article 《Simultaneous roasting and extraction of green coffee beans by pressurized liquid extraction》. Keywords: coffee bean extraction; Antioxidant activity; Chlorogenic acids; Coffee roasting; Pressurized liquid extraction; Volatile compounds.They researched the compound: 2-Ethylpyrazine( cas:13925-00-3 ).Recommanded Product: 13925-00-3. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:13925-00-3) here.

Green coffee extracted by pressurized liquid extraction (PLE) was found to undergo a roasting process similar to traditional roasting. Liquid chromatog.-tandem mass spectrometry was used to investigate the chlorogenic acid (CGA) composition and profiling changes by PLE under different extraction conditions and showed almost identical generation and degradation of CGAs occurring during traditional coffee roasting. Compared with the traditional extraction of roasted coffee, optimized PLE coffee showed three- and two-fold higher antioxidant activity and total CGA contents, resp. Composition diversity and the content of volatile compounds in PLE coffee were found to increase as the PLE temperature increased but were lower than those of traditionally roasted coffee. The sensory attributes of PLE coffee were also evaluated to have be associated with a profile change in the volatile compounds and non-volatile CGA compounds

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Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Catalysis Letters called Acidic-Basic Bifunctional Magnetic Mesoporous CoFe2O4@(CaO-ZnO) for the Synthesis of Glycerol Carbonate, Author is Zhang, Pingbo; Chen, Yifeng; Zhu, Mengnan; Yue, Chengguang; Dong, Yuming; Leng, Yan; Fan, Mingming; Jiang, Pingping, which mentions a compound: 931-40-8, SMILESS is O=C1OCC(CO)O1, Molecular C4H6O4, Product Details of 931-40-8.

Magnetic mesoporous CoFe2O4@(CaO-ZnO) exhibited good catalytic activity in the transesterification of glycerol and di-Me carbonate to yield glycerol carbonate. The glycerol conversion of 97.7% and glycerol carbonate yield of 96.9% could be obtained in this reaction system under the optimized reaction conditions. CoFe2O4@(CaO-ZnO) was characterized by a series of techniques including TPD, XRD, SEM, TEM, EDS, VSM and BET to evaluate the physico-chem. properties of the catalyst. It was demonstrated that the interaction of acid-base sites improved the catalysis performance of CoFe2O4@(CaO-ZnO): the strong basic sites were beneficial to the activation of glycerol to glyceroxide anion which could increase glycerol conversion, and the acid site contributes to the carbonyl activation of di-Me carbonate, converts glyceroxide anion to glycerol carbonate, and improves the selectivity of glycerol carbonate. Meanwhile, the solid-liquid separation process after reaction would be simplified significantly considering CoFe2O4@(CaO-ZnO) could be easily separated from the reaction mixture under magnetic action.

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Name: 4-(Hydroxymethyl)-1,3-dioxolan-2-one. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Development of two plant-wide glycerol carbonate production processes: Design, optimization and environmental analysis.

This work firstly presents the rigorous modeling of the two plant-wide glycerol carbonate (GC) production processes through the transesterification reaction of glycerol (GLY). One is the separated reaction and distillation (SRD) process, and the other is the reactive distillation-based (RD) process. This work covers the thermodn. and kinetic verification, the rigorous simulation of the two processes, and optimization of the proposed processes based on simulated annealing method. From optimization, it is found that the RD process reduced about 33.1% cost from the SRD process. Also, carbon emission analyses are performed on the two optimized processes, in which the CO2 emission amount per unit amount of GC formation (CO2-e, in kg CO2/kg GC) are calculated It is reported that the RD process reduces 36.1% of CO2 emission (CO2-e=0.207) compared with the SRD process (CO2-e=0.322).

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