Month: October 2022

Nurasia; Pirda published the artcile< Identification of secondary metabolite compounds and gc-ms test (gas chromatography mass spectroscopy) on purslane plant (Portulaca oleracea L)>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is Portulacaoleracea secondarymetabolite gaschromatog mass pectroscopy.

This study aims to analyze the types of secondary metabolite compounds contained in purslane plants (Portulaca oleracea). Ethanol extract of roots, stems and purslane leaves was obtained by maceration of root, stem and leaf samples using 96% ethanol for 3×24 h. Phytochem. tests for ethanol extracts of roots, stems and purslane leaves include examination of alkaloids, saponins, tannins, flavonoids, steroids and terpenoids. Phytochem. test results showed that the ethanol extract of roots and purslane pos. stems contained alkaloids, tannins, saponins, steroids, flavonoids and terpenoids. While the phytochem. test results of pos. purslane leaf ethanol extracts contain alkaloids, tannins, terpenoids and saponins. Then the secondary metabolite compounds are identified using GC-MS (Gas Chromatog. Mass Spectroscopy). The results of the identification of ethanol extracts of roots, stems and purslane leaves found the most compounds At the root are stigmast, phenol, propionate, hexadecanoic acid and octadecanoic acid. In the stems are ethylcholest, campasterol, borabicyclo [3.1.3] nonane, stigmast and phenol. The leaves are phenol, stigmast, phenol, Me linolenic acid and headecanoic acid.

Journal of Physics: Conference Series published new progress about Alkaloids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dongil, Ana B.; Bachiller-Baeza, Belen; Guerrero-Ruiz, Antonio; Rodriguez-Ramos, Inmaculada published the artcile< Graphite oxide as support for the immobilization of Ru-BINAP: Application in the enantioselective hydrogenation of methylacetoacetate>, Name: (R)-Methyl 2-hydroxybutanoate, the main research area is methyl acetoacetate hydrogenation catalyst modified graphite oxide support.

Graphite oxide (GO), previously functionalized with an alkoxysilane or with an isocyanate, and a chiral amine, was used as support for the immobilization of the homogeneous Ru-BINAP complex. The functionalized supports and the hybrid catalysts were characterized by XRD, NMR, TG, DRIFTS and XPS techniques. Among the hybrid catalysts the more active and enantioselective in the hydrogenation of Me acetoacetate is the sample prepared over the nonfunctionalized GO. The catalytic performance can be interpreted in terms of the metal complex interacting with the O functional groups or with the chiral amine at its different locations, anchored covalently onto the Cl pendant positions or via acid-base interaction at the O functional groups.

Catalysis Communications published new progress about Catalyst supports. 73349-07-2 belongs to class esters-buliding-blocks, and the molecular formula is C5H10O3, Name: (R)-Methyl 2-hydroxybutanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hu, Lan; Arifuzzaman, M. D.; Zhao, Yan published the artcile< Controlling Product Inhibition through Substrate-Specific Active Sites in Nanoparticle-Based Phosphodiesterase and Esterase>, Category: esters-buliding-blocks, the main research area is controlling product substrate nanoparticle phosphodiesterase esterase.

Hydrolysis of phosphodiester bonds is catalyzed efficiently by DNA- and RNA-hydrolyzing enzymes, but their synthetic mimics often fail to display catalytic turnovers because the phosphate products tend to bind the catalytic metal more strongly than the substrates. In this work, we report the direct usage of a phosphate diester substrate as the template, and through micellar imprinting and postfunctionalization, we created water-soluble nanoparticle catalysts with an active site closely matching the substrate. With a preferential binding for the substrate and a zinc cation in the close proximity of the phosphate, the resulting synthetic phosphodiesterase displayed turnovers 1 order of magnitude higher than the highest reported previously. The same strategy was used to prepare synthetic esterase with hundreds of turnovers and ability to distinguish closely related substrates.

ACS Catalysis published new progress about Enzyme functional sites, active (designed using substrate template). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Sui, Meng; Li, Fashe; Wang, Shuang; Wang, Hua published the artcile< Molecular dynamics simulation and experimental research on the oxidation reaction of methyl linoleate at low oxygen and high temperature>, Related Products of 112-63-0, the main research area is methyl linoleate oxygen temperature mol dynamics simulation oxidation.

The pyrolysis and low-oxygen high-temperature oxidation process of Me linoleate containing two unsaturated double bonds were analyzed by kinetic anal., d. functional theory calculation and ReaxFF-MD considering it as a substitute for biodiesel. The combined system of TG-FTIR-MS was used to analyze the escape characteristics of multi-component gas product during the pyrolysis as well as high-temperature oxidation of Me linoleate under low-oxygen. The ReaxFF-MD mol. dynamics method was used to analyze the effect of initial reaction path of the thermal decomposition of Me linoleate and the oxygen content on the oxidation reaction products. The results show that the pyrolysis of Me linoleate has reaction activation energy of 58.2 kJ/mol, while, for the high-temperature oxidation process under low oxygen, it is 58.79 kJ/mol. The main gaseous products are CO2, CH4, CO/C2H4, H2O and products containing C-H, C-O, C=O and other functional groups. Through DFT calculations and ReaxFF-MD, we found that breaking of C-O bond leading to the formation of smaller CH3 radical and decarboxylation to form CO2 constitute the initiation mechanism for the pyrolysis of Me linoleate pyrolysis and high-temperature oxidation in presence of low oxygen. The double bond of Me linoleate is prone to generate C7H10 intermediates with higher carbon content during the pyrolysis process. At the same time, through simulation, we found that oxygen and fuel are mixed as soon as possible at the beginning of the combustion of Me linoleate which helps to reduce the production of C2 products from the pyrolysis of Me linoleate.

Fuel published new progress about Activation energy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Chang, Chun-Wei; Wu, Chia-Hui; Lin, Mei-Huei; Liao, Pin-Hsuan; Chang, Chun-Chi; Chuang, Hsiao-Han; Lin, Su-Ching; Lam, Sarah; Verma, Ved Prakash; Hsu, Chao-Ping; Wang, Cheng-Chung published the artcile< Establishment of Guidelines for the Control of Glycosylation Reactions and Intermediates by Quantitative Assessment of Reactivity>, Electric Literature of 34637-22-4, the main research area is predicted stereocontrolled glycosylation relative reactivity thioglycoside; carbohydrates; diastereoselectivity; glycosylation.

Stereocontrolled chem. glycosylation remains a major challenge despite vast efforts reported over many decades and so far still mainly relies on trial and error. Now it is shown that the relative reactivity value (RRV) of thioglycosides is an indicator for revealing stereoselectivities according to four types of acceptors. Mechanistic studies show that the reaction is dominated by two distinct intermediates: glycosyl triflates and glycosyl halides from N-halosuccinimide (NXS)/TfOH. The formation of glycosyl halide is highly correlated with the production of α-glycoside. These findings enable glycosylation reactions to be foreseen by using RRVs as an α/β-selectivity indicator and guidelines and rules to be developed for stereocontrolled glycosylation.

Angewandte Chemie, International Edition published new progress about Diastereoselective synthesis. 34637-22-4 belongs to class esters-buliding-blocks, and the molecular formula is C11H15NO3, Electric Literature of 34637-22-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ferorelli, S.; Loiodice, F.; Tortorella, V.; Amoroso, R.; Bettoni, G.; Conte-Camerino, D.; De Luca, A. published the artcile< Isosteres of chiral clofibric acid analogs: synthesis, resolution, absolute configuration and HPLC detection of the optical purity>, COA of Formula: C5H10O3, the main research area is clofibric acid analog isostere preparation resolution; configuration absolute clofibric acid analog; resolution clofibric acid analog isostere.

Both racemic and enantiomeric forms of some isosteres of chiral clofibric acid analogs have been synthesized. Also, the absolute configuration has been established by chem. correlation and the optical purity determined by a simple HPLC procedure. The isosteric substitution of the ether oxygen atom of α-aryloxy alkanoic acids with sulfur, amino and methylene groups lead to compounds in which both biol. activity and stereoselectivity regarding chloride channel are highly reduced.

Farmaco published new progress about Absolute configuration. 73349-07-2 belongs to class esters-buliding-blocks, and the molecular formula is C5H10O3, COA of Formula: C5H10O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Popa, Flavia; Lameiras, Pedro; Moldovan, Oana; Tomoaia-Cotisel, Maria; Henon, Eric; Martinez, Agathe; Sacalis, Carmen; Mocanu, Aurora; Ramondenc, Yvan; Darabantu, Mircea published the artcile< Design, synthesis and structure of new dendritic melamines. First use of a tandem C-2-substituted serinol-O,O-masked 4-piperidone as a peripheral unit in iterative synthesis>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is dendritic melamine piperidone iterative synthesis.

The iterative chemoselective amination of cyanuric chloride to dimers of new G-2 dendritic N-substituted-2,4,6-triamino-s-triazines (melamines) having C-2-substituted 2-aminopropane-1,3-diols (‘serinols’) in tandem with the ethylene ketal of 4-piperidone as peripheral units is reported. The structure as a function of increasing mol. size was studied by NMR spectroscopy, DFT calculation and AFM imaging. A concise nomenclature defining the restricted rotational phenomena about the newly created C(s-triazine)-N(exocyclic) partial double bonds, seen as axes of (pro)diastereomerism, is used. We propose a new form of frontier rotamerism for the dendrimer surface, which operates over a long range.

Tetrahedron published new progress about Dendrimers, polyamines Role: SPN (Synthetic Preparation), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Mori, K.; Sasaki, M.; Tamada, S.; Suguro, T.; Masuda, S. published the artcile< Pheromone synthesis. XXIX. Synthesis of optically active 2-ethyl-1,6-dioxaspiro[4.4]nonane (chalcogran), the principal aggregation pheromone of Pityogenes chalcographus (L.)>, COA of Formula: C5H10O3, the main research area is chalcogran Pityogenes total synthesis.

The 2R,5RS and 2S,5RS isomers of chalcogran (I) were prepared as 40.1:59.9 and 41.3:58.7 mixtures, resp., of diastereoisomers. The key step (yield 30.1-9.4%) was alkylation of α-acetyl-γ-butyrolactone dianion by (R)-(+)- or (S)-(-)-1,2-epoxybutane followed by alk. hydrolysis, decarboxylation, and acidification.

Tetrahedron published new progress about Pheromones, animal, aggregating Role: RCT (Reactant), RACT (Reactant or Reagent). 73349-07-2 belongs to class esters-buliding-blocks, and the molecular formula is C5H10O3, COA of Formula: C5H10O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Luo, Longjuan; Gao, Xianli; Feng, Yunzi; Zhao, Haifeng; Zhao, Mouming published the artcile< Comparative study on aroma compounds in Chinese-type and Japanese-type soy sauces>, Electric Literature of 112-63-0, the main research area is Chinese Japanese type soy sauce aroma compound.

The volatile aroma compounds in Chinese-type and Japanese-type soy sauces were separated and concentrated by direct solvent extraction, and identified by gas chromatog.-mass spectrometry. The results showed that 94 aroma compounds were identified in Chinese-type soy sauces, and 125 aroma compounds were identified in Japanese-type soy sauces. The main aroma compounds in Chinese-type soy sauces were 35.97% esters, 17.79% alcs., 16.05% acids and 8.67% aldehydes and ketones, whereas 52.98% esters, 24.01% acids, 9.31% alcs. and 6.02% aldehydes and ketones consisted of the most of volatile aroma compounds in Japanese-type soy sauce. The difference of varieties and relative quantities of aroma compounds created the flavor discrepancy of Chinese-type and Japanese-type soy sauces.

Zhongguo Niangzao published new progress about Food analysis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Shu, Wei; Garcia-Dominguez, Andres; Quiros, M. Teresa; Mondal, Rahul; Cardenas, Diego J.; Nevado, Cristina published the artcile< Ni-Catalyzed Reductive Dicarbofunctionalization of Nonactivated Alkenes: Scope and Mechanistic Insights>, Quality Control of 151259-38-0, the main research area is nickel catalyzed reductive carbofunctionalization alkene scope mechanism.

Olefins devoid of directing or activating groups have been dicarbofunctionalized here with two electrophilic carbon sources under reductive conditions. Simultaneous formation of one C(sp3)-C(sp3) and one C(sp3)-C(sp2) bond across a variety of unbiased π-systems proceeds with exquisite selectivity by the combination of a Ni catalyst with TDAE as sacrificial reductant. Control experiments and computational studies revealed the feasibility of a radical-based mechanism involving, formally, two interconnected Ni(I)/Ni(III) processes and demonstrated the different ability of Ni(I) species (Ni(I)I vs PhNi(I)) to reduce the C(sp3)-I bond. The role of the reductant was also investigated in depth, suggesting that a one-electron reduction of Ni(II) species to Ni(I) is thermodynamically favored. Further, the preferential activation of alkyl vs aryl halides by ArNi(I) complexes as well as the high affinity of ArNi(II) for secondary over tertiary C-centered radicals explains the lack of undesired homo- and direct coupling products (Ar-Ar, Ar-Alk) in these transformations.

Journal of the American Chemical Society published new progress about Alkadienes Role: RCT (Reactant), RACT (Reactant or Reagent). 151259-38-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H19NO2, Quality Control of 151259-38-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics