Day: March 28, 2022

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, Catalysis Letters called Continuous Synthesis of Glycerol Carbonate by Transesterification of Glycerol with Dimethyl Carbonate Over Fe-La Mixed Oxide Catalysts, Author is Pattanaik, Piyusa P.; Kumar, P. Mahesh; Raju, N.; Lingaiah, N., the main research direction is glycerol dimethyl carbonate transesterification iron lanthanum oxide catalyst property.Application In Synthesis of 4-(Hydroxymethyl)-1,3-dioxolan-2-one.

Transesterification of glycerol with di-Me carbonate to produce glycerol carbonate was studied under continuous reaction over Fe-La mixed oxide catalysts. A series of Fe-La oxide catalysts with different molar compositions were synthesized by co-precipitation method. Surface and structural investigations of the catalysts were carried using N2 physisorption, powder X-ray diffraction, temperature-programmed desorption, XPS, FT-infra red spectroscopy, SEM and Laser Raman spectroscopy. Glycerol carbonate yield was influenced by the molar ratios of Fe/La and catalyst calcination temperature, which are responsible for the variation in acid-base properties of the catalysts. The catalyst with a molar ratio of 1:1 calcined at 550°C exhibited superior activity with 71% yield of glycerol carbonate. The synergistic effect between Fe-La oxides and the formation of LaFeO3 perovskite structure are responsible for the high activity of the catalyst. The catalyst exhibited unprecedented stability over 100 h during the time on stream anal.

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Reference:
Chiral Catalysts,
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Cordoba, Nancy; Pataquiva, Laura; Osorio, Coralia; Moreno, Fabian Leonardo Moreno; Ruiz, Ruth Yolanda published an article about the compound: 2-Ethylpyrazine( cas:13925-00-3,SMILESS:CCC1=NC=CN=C1 ).Recommanded Product: 13925-00-3. 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:13925-00-3) through the article.

The effects of grinding (medium-coarse) and extraction time (14-22 h) on the physicochem. and sensorial properties of cold brew coffee produced using two types of Colombian specialty coffees (Huila and Narinõ) were evaluated. Cold coffee brewed under coarse grinding and 22 h of extraction exhibited the highest values of total dissolved solids, extraction yield, pH, titratable acidity (TA), and total phenolic content. The type of coffee used mainly affected the TA and pH. All cold brew coffee samples had lower TA values than their hot counterparts. Narinõ cold brew samples had higher TA values than those of Huila in all treatments evaluated. Higher scores were reported in the sensorial evaluation of cold brew coffee when prepared using the shortest time (14 h) and coarse grinding for both coffee types. These coffees were characterized by strong sweetness, fruity and floral flavours, medium bitterness and acidity, and a creamy body. Furans, pyrazines, ketones, aldehydes, pyrroles, esters, lactones, furanones, and phenols were detected as odor-active compounds The findings of this study demonstrate that the particle size, contact time, and coffee type affect the physicochem. and sensorial characteristics of cold brew coffee, leading to cold brew coffees with different flavor profiles.

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Reference:
Chiral Catalysts,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: H-Leu-NH2.HCl, is researched, Molecular C6H15ClN2O, CAS is 10466-61-2, about Synthesis of polypeptides by microwave heating I. Formation of polypeptides during repeated hydration-dehydration cycles and their characterization, the main research direction is polymerization amino acid amide microwave.Application In Synthesis of H-Leu-NH2.HCl.

Amino acid amides effectively reacted to produce polypeptides in response to microwave heating during repeated hydration-dehydration cycles. The polypeptides, formed from a mixture of glycinamide, alaninamide, valinamide, and aspartic acid α-amide, had mol. weights ranging from 1000 to 4000 daltons. Amino acids were incorporated into the polypeptides in proportion to the starting concentrations, with the exception of glycine, whose incorporation was 1.5 times higher than that of the other amino acids. The polypeptides had some definite secondary structure, such as α-helix and β-sheet, in aqueous solution This reaction provides not only a convenient method for abiotic peptide formation but also a convenient method for the chem. synthesis of peptides.

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Reference:
Chiral Catalysts,
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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The thermal decomposition of dialkyl chelidamates and related esters》. Authors are Markees, D. G..The article about the compound:4-Hydroxypicolinic acidcas:22468-26-4,SMILESS:O=C(O)C1=NC=CC(O)=C1).Product Details of 22468-26-4. Through the article, more information about this compound (cas:22468-26-4) is conveyed.

Di-Me 4-hydroxydipicolinate (I) heated to 200-10° lost CO2 and was converted into a mixture of di-Me 4-methoxypyridine-2,6-dicarboxylate (Ia) and N-methyl-4-pyridone (Ib). Decomposition of di-Et 4-hydroxydipicolinate (Ic) proceeded similarly but in addition to di-Et 4- ethoxypyridine-2,6-dicarboxylate and N-ethyl-4-pyridone (II) there was also isolated some Et 4-ethoxypicolinate (III). Pyrolysis of Et 4-hydroxypicolinate (IV) gave mostly II and some 4-ethoxypyridine. IV.HCl decomposed to EtCl and 4-hydroxypicolinic acid (V). III was synthesized from V by esterification and replacement of the OH by Cl and then an EtO group. N-Alkyl-4-pyridones were converted into derivatives for identification.

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Reference:
Chiral Catalysts,
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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《New preparation and some reactions of di(β-chloroethyl) sulfate》. Authors are Suter, C. M.; Evans, Peter B..The article about the compound:2-Chloroethyl acetatecas:542-58-5,SMILESS:CC(OCCCl)=O).Computed Properties of C4H7ClO2. Through the article, more information about this compound (cas:542-58-5) is conveyed.

Distillation of 100 g. (ClCH2CH2)2O and 48.4 g. of SO3 at 2-3 mm. gives 91% (102 g.) of (ClCH2CH2)2SO4 (I), b3 126-9°; if the I is stirred with warm dilute alkali before the 2nd distillation the ester remains water-white indefinitely. Refluxing 20 g. I, 7.5 g. AcONa and 15 cc. AcOH for 1 h. gives 95.5% of ClCH2CH2OAc; BzONa and I, heated 2 h. at 170°, give 61.5% of ClCH2CH2OBz. I (0.112 mol.) and the Grignard reagent from 0.075 mol. PhCH2Cl give 66% of Ph(CH2)3Cl; PhMgBr gives 25% of Ph(CH2)2Cl. Various other reactions are discussed. (BrCH2CH2)2O gives a low yield of I. Attempts to obtain sulfates from Pr2O and (ClCH2CH2CH2)2O gave tarry reaction mixtures which could not be distilled even in a high vacuum.

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare