Day: April 8, 2022

Category: chiral-catalyst. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 2-Chloroethyl acetate, is researched, Molecular C4H7ClO2, CAS is 542-58-5, about Synthesis of complex halo esters from α-chloromethyl esters of carboxylic acids. Author is Pishnamazzade, B. F.; Gasanova, Sh. D..

cf. CA 63:5534e. AcOCH2Cl (I) (105 g.) and 233.7 g. ClCH2CH2OH heated 10 hrs. at 50-60° yielded 38% AcOCH2CH2Cl, and 34% CH2(OCH2CH2Cl)2. PrCO2CH2CH2Cl was prepared similarly. I (56 g.) and 200 g. HOCH(CH2Cl)2 gave 46% AcOCH(CH2Cl)2, b3 97-8°, n20D 1.4785, d20 1.3914, and 40% CH2[OCH(CH2Cl)2]2, b3 197-9°, n20D 1.4960, d20 1.3868. Similarly, 8.5 g. I and 25 g. MeCCl:CHCH2OH yielded 40% AcOCH2CH:CClMe, b4 64-5°, n20D 1.4700, d20 1.1517, and 30% CH2(OCH2CH:CClMe)2. Similarly was prepared CCl3CO2CH2CH:CClMe, b4 100-2°, n20D 1.4762, d20 1.4143.

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Chiral Catalysts,
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Application In Synthesis of 2-Ethylpyrazine. 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: 2-Ethylpyrazine, is researched, Molecular C6H8N2, CAS is 13925-00-3, about Spent coffee grounds and tea leaf residues: Characterization, evaluation of thermal reactivity and recovery of high-value compounds.

Spent coffee grounds (SCGs) and tea leaf residues are investigated as a potential source of bioenergy and biochems. and compared to several woody biomasses. The effect of initial processing (coffee roasting and tea oxidizing) on feedstock composition and thermal behavior is assessed exptl. and anal. In addition to proximate and ultimate analyses, the materials are examined by combustion tests coupled with Fourier-transform IR spectroscopy and thermogravimetric anal. coupled with mass spectrometry in oxidizing and inert atmospheres. The biggest differences in composition of the samples are found in the high elemental N and S contents of SCGs (2.9 wt% of N and 0.1 wt% of S on average) and especially tea leaf residues (4.5 wt% of N and 0.2 wt% of S on average). The elevated N and S values lead to NO and SO2 release during combustion. Overall, the obtained levels of reactivity and heating values (with a maximum higher heating value of 24 MJ kg-1 for the Arabica-Robusta coffee blend) confirm the significant energy potential of both the coffee and tea samples. Mass spectrometry anal. of the studied materials reveals higher heterogeneity of macromol. composition of coffee and tea samples compared to woody biomasses. Pyridine, pyrazine, phenols and acetic acid are the most abundant among detected species and have demonstrated beneficial characteristics for a broad spectrum of human activities. The composition characteristics and reactivity test results presented in this work promote more effective valorization and usage of these currently little used biomass residues.

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Chiral Catalysts,
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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 Optimizing the Surface Properties of MgO Nanoparticles Towards the Transesterification of Glycerol to Glycerol Carbonate, published in 2019, which mentions a compound: 931-40-8, Name is 4-(Hydroxymethyl)-1,3-dioxolan-2-one, Molecular C4H6O4, Synthetic Route of C4H6O4.

MgO nanoparticles (NPs) were successfully fabricated by a facile, inexpensive and green synthesis protocol using soluble starch as a green bio-template. The influence of calcination temperature on its textural properties and catalytic efficiency has been investigated in detail. The enhancement of MgO NPs crystallinity by increasing the calcination temperature is found from X-ray diffraction and Transmission electron microscopy analyzes. N2-sorption studies and CO2-temperature program desorption (TPD) measurements revealed that the MgO NPs calcined at 500 °C have superior textural properties and strong surface basicity. XPS anal. conferred that the MgO-500 NPs furnished the optimized surface Lewis sites, consequently outperforms better transesterification activity. The fabricated MgO-500 NPs exhibited an excellent catalytic activity toward the efficient conversion of glycerol to glycerol carbonate (GC) with more than 93% selectivity. The intelligibility of the adopted synthesis is eco-benign and wide utility as a solid base catalyst for several organic transformations.

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Chiral Catalysts,
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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: 13925-00-3, is researched, SMILESS is CCC1=NC=CN=C1, Molecular C6H8N2Journal, Journal of Essential Oil-Bearing Plants called Chemical Composition, Antimicrobial, Hemolytic, and Antiproliferative Activity of Essential Oils from Ephedra intermedia Schrenk & Mey, Author is Ni, Jingli; Mahdavi, Behnam; Ghezi, Somayeh, the main research direction is essential oil ephedra schrenk chem antimicrobial hemolytic antiproliferative.Product Details of 13925-00-3.

We report the chem. composition and bioactivity of flowers essential oil of Ephedra intermedia (EIO) for the first time. The essential oil was obtained using a Clevenger-type apparatus The essential oil composition was identified by chromatog. methods. The min. inhibitory concentration method (MIC) was chosen to investigate antibacterial activity of EIO. Hemolytic activity and the cytotoxicity effects of EIO on human cancer cells were also evaluated. The essential oil was dominated by 2-ethyl-pyrazine (67.37%), γ-elemene (9.21%), benzyl acetate (9.10%), 2-methyl-Bu acetate (5.28%). EIO prevented the growth of 6 out of 7 selected microorganisms. The highest activity was observed against Enterococcus faecalis. Due to the low hemolytic rate (below 2.53%) on humane red blood cells (hRBS); the safety of EIO as an additive for different aspects can be considered. On the other hand, EIO presented anti-proliferative effect on Hela, HCT116, and LnCap cells with mortality of 67% to 81%.

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Chiral Catalysts,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Preparation of mesoporous CaO-ZrO2 catalysts without template for the continuous synthesis of glycerol carbonate in a fixed-bed reactor, the main research direction is mesoporous CaO ZrO2 catalyst glycerol carbonate fixed bed reactor.Safety of 4-(Hydroxymethyl)-1,3-dioxolan-2-one.

Recently, transformation of glycerol into glycerol carbonate (GLC) has been of critical importance. Although traditional Ca-based catalysts present high activity for the GLC synthesis, their industrial applications are hindered by the leaching of Ca2+. Here, a series of mesoporous CaO-ZrO2 with high surface area were obtained without template. CO2 temperature-programmed desorption displayed that the basic properties of the catalysts can be controlled by the content of Ca dopant. Importantly, Ca2+ can be introduced into t-ZrO2 lattice, resulting in the formation of a solid solution structure. Based on systematic experiments, a correlation between their basic properties and catalytic behavior was explained. Under the optimized conditions, the catalyst with a certain ratio of Ca: Zr = 0.6: 1 showed an excellent performance with a 97% glycerol conversion and a 93% selectivity of GLC. Furthermore, the solid solution structure rendered this catalyst high resistance to reactant flushing in a fixed-bed, without leaching of active sites.

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Chiral Catalysts,
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Recommanded Product: 13925-00-3. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2-Ethylpyrazine, is researched, Molecular C6H8N2, CAS is 13925-00-3, about Determination of antioxidant capacity, phenolics and volatile maillard reaction products in rye-buckwheat biscuits supplemented with 3β-d-rutinoside. Author is Starowicz, Malgorzata; Koutsidis, Georgios; Zielinski, Henryk.

The Maillard reaction (MR) is responsible for the development of color, taste and aroma in bakery products though the formation of numerous aroma compounds such as pyrazines, pyrroles and aldehydes, nonvolatile taste active compounds and melanoidins. In this article, we investigate the effect of quercetin 3β-D-rutinoside (rutin) supplementation, at the level of 5-50 mg per 100 g, of rye-buckwheat biscuits on the formation of phenolics and volatile Maillard reaction products (MRPs) such as pyrazines, furfuryl alc. and furfural, determined by headspace solid phase microextraction followed by gas chromatog.-mass spectrometry (HS-SPME/GC-MS), in addition to the effect on the antioxidant capacity. The study confirmed that rutin was stable under baking conditions as showed by its content in rye-buckwheat biscuits. Supplementation of biscuits with increasing amounts of rutin resulted in the progressive increase of total phenolics and antioxidant capacity measured by DPPH and OxHLIA assays, but it had no effect on their sensory quality. From the eighteen compounds identified by HS-SPME/GC-MS in the volatile fraction of biscuits were quantitated as a compounds-of-interest: methylpyrazine, ethylpyrazine, 2,3-; 2,5- and 2,6-dimethylpyrazines, as well as furfural, furfuryl alc. and hexanal. The rutin supplementation of biscuits might be one of the factors to influence the formation of both desirable volatile compounds and undesirable toxic compounds In conclusion, this study indicates for the significant role of polyphenols on the formation of volatile compounds in biscuits with possible future application in the development of healthy bakery products with high antioxidant capacity.

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Chiral Catalysts,
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Rittiron, Pacharaporn; Niamnuy, Chalida; Donphai, Waleeporn; Chareonpanich, Metta; Seubsai, Anusorn published an article about the compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one( cas:931-40-8,SMILESS:O=C1OCC(CO)O1 ).Recommanded Product: 4-(Hydroxymethyl)-1,3-dioxolan-2-one. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:931-40-8) through the article.

Glycerol carbonate (GLC) was synthesized from glycerol and di-Me carbonate over sodium aluminate (NaAlO2) catalysts. The catalysts were prepared using a spray-drying method and compared with those prepared using the conventional hot-air drying method. Polyvinylpyrrolidone and glycerol were used as a catalyst template to increase the surface area and porosity of the catalysts. Addnl., different operating conditions were investigated such as the catalyst concentration, glycerol-to-dimethyl carbonate ratio, reaction temperature, reaction time, and catalyst reusability. The NaAlO2 catalyst prepared using the spray-drying method with 30 wt% glycerol as the template yielded the maximum GLC (85%) with 100% GLC selectivity.

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Chiral Catalysts,
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Category: chiral-catalyst. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 4-(Hydroxymethyl)-1,3-dioxolan-2-one, is researched, Molecular C4H6O4, CAS is 931-40-8, about Influence of biochar composition and source material on catalytic performance: the carboxylation of glycerol with CO2 as a case study. Author is Collett, Catherine; Masek, Ondrej; Razali, Nurul; McGregor, James.

The impact of the chem. and phys. composition of biochar catalysts is demonstrated in the carboxylation of glycerol with carbon dioxide for the first time, using acetonitrile as a dehydrating agent. Biochars are an important emerging class of catalytic material that can readily be produced from low-value biomass residues; however, the impact of feedstock choice is often overlooked. The ash content of biochar from three different feedstocks is shown to be catalytically active for the production of glycerol carbonate and triacetin, while low-ash catalysts such as soft wood biochar and com. activated charcoal are inactive. Following treatment with hydrochloric acid, yields of glycerol carbonate over ash were reduced by over 94%, and triacetin was no longer produced. This has been attributed to the loss of potassium content. Carbon content was shown to be catalytically active for the synthesis of diacetin, and graphitic carbon may be beneficial. Through the development of structure-performance relationships, biomass feedstocks with the most suitable properties can therefore be selected to produce biochars for specific catalytic applications. This would expand the range of reactions which can be effectively catalyzed by these materials and enhance the development of a more circular and sustainable chems. industry.

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Chiral Catalysts,
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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 Exploring the Promotional Effects of K, Sr, and Mg on the Catalytic Stability of Red Mud for the Synthesis of Glycerol Carbonate from Renewable Glycerol, published in 2019-09-04, which mentions a compound: 931-40-8, Name is 4-(Hydroxymethyl)-1,3-dioxolan-2-one, Molecular C4H6O4, HPLC of Formula: 931-40-8.

The focus of this study was to utilize red mud (RM), an aluminum industry waste, for the preparation of various catalysts for the synthesis of glycerol carbonate (GC) from glycerol (GL). A series of catalysts were prepared by doping potassium, strontium, and magnesium on the surface of RM, and their effect on the stability of RM based catalysts was examined From preliminary studies, K-doped RM catalysts were found to have better activity as well as stability than the Sr- and Mg-doped RM catalysts for the transesterification of GL. The RK-30%-800 catalyst prepared by 30% K loading and calcination at 800 °C produced the highest activity and stability compared to other K-doped catalysts. The better activity of the RK-30% catalyst was due to the presence of the maximum surface concentration of active K2O, which was confirmed from the XRD anal. The surface concentration of K2O contributed significantly to the increased basic properties of the catalyst, which was quite evident from the acid-base titration, CO2-temperature programmed desorption (CO2-TPD), and Hammett indicator test. A probable mechanism of the GL transesterification process by using the RK-30%-800 catalyst was proposed. Moreover, effect of the presence of impurities on the catalytic activity, the reaction kinetics, reusability study, and deactivation mechanism were studied in detail here.

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Chiral Catalysts,
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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, Article, Dalton Transactions called Synthesis of helical aluminium catalysts for cyclic carbonate formation, Author is Gaona, Miguel A.; de la Cruz-Martinez, Felipe; Fernandez-Baeza, Juan; Sanchez-Barba, Luis F.; Alonso-Moreno, Carlos; Rodriguez, Ana M.; Rodriguez-Dieguez, Antonio; Castro-Osma, Jose A.; Otero, Antonio; Lara-Sanchez, Agustin, the main research direction is cyclic carbonate preparation; epoxide carbon dioxide chem fixation helical aluminum catalyst.HPLC of Formula: 931-40-8.

Helical aluminum complexes [Al2X4(μ-nbptam)] (X = Me, Et; (nbptamH = N-naphthyl-2,2-bis(3,5-dimethylpyrazol-1-yl)thioacetamide)), [Al2X4(μ-fbpam)] (fbpamH = N-fluorenyl-2,2-bis(3,5-dimethylpyrazol-1-yl)acetamide), [Al3X7(μ-nbptam)] and [Al3X7(μ-fbpam)] have been prepared by treatment of scorpionate ligand precursors with two or three equivalent of the corresponding trialkylaluminum derivative AlX3. The structures of these complexes have been determined by spectroscopic methods and the X-ray crystal structure of complex [Al2X4(μ-nbptam)] (X = Me) has also been established. These complexes have been studied as catalysts for the chem. fixation of carbon dioxide into cyclic carbonates I (R = Ph, Me, CH2Cl, CH2OC6H5, etc.) and II (R1R2 = -(CH2)3-, R3 = H; R1 = R2 = Me, R3 = H; R1 = H, R2 = R3 = Me; R1 = H, R2 = R3 = Ph; R1 = H, R2 = Me, R3 = Ph) displaying good catalytic activity. When cis-cyclohexene oxide was used as a substrate, polyether-polycarbonate was obtained in a ratio which is highly dependent on the cocatalyst and the catalyst to cocatalyst ratio used.

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Chiral Catalysts,
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