Tag: 100-200

On December 15, 2020, Lu, Nan; Yan, Xiaoqing; Kobayashi, Hisayoshi; Liu, Wen; Chen, Shuang; Liang, Shipan; Zhang, Jiemei; Li, Renhong published an article.Application of 85-91-6 The title of the article was Oxygen-mediated water splitting on metal-free heterogeneous photocatalyst under visible light. And the article contained the following:

We report a visible-light-driven, photocatalytic partial water splitting process that proceeds via an oxygen-mediated, sequential single-electron transfer mechanism over heterogeneous photocatalysts. In the absence of any cocatalyst, hydrogen evolution efficiency of 78.9 and 643.0μmol h-1 g-1catalyst were achieved over a simple carbon nitride catalyst from methanol and formaldehyde solutions, resp., in 1.0 bar O2 atmosphere at room temperature On the carbon nitride catalyst, mol. O2 is photocatalytically transformed into reactive oxygen species, which acted both as an oxidant and as a homogeneous catalyst for the partial photocatalytic water splitting reaction, resulting in the two-step oxidation of methanol to formaldehyde and subsequently formic acid. DFT calculations reveal that the new oxygen mediated photocatalytic hydrogen evolution pathway proceeds with virtually zero activation energy. Further improvement in hydrogen evolution efficiency was attained by doping the carbon nitride catalyst with phosphorous and sulfur, which promoted the transport of photogenerated charge carriers. The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Application of 85-91-6

The Article related to oxygen water splitting metal free heterogeneous photocatalyst visible light, Electrochemical, Radiational, and Thermal Energy Technology: Other and other aspects.Application of 85-91-6

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

On June 30, 2017, Park, Heemin; Kwon, Yongseok; Shin, Jae Eui; Kim, Woo-Jung; Hwang, Soonho; Lee, Seokwoo; Kim, Sanghee published an article.Quality Control of (Trimethoxymethyl)benzene The title of the article was Orthoester in Cyclodehydration of Carbamate-Protected Amino Alcohols under Acidic Conditions. And the article contained the following:

The first acid-promoted reaction system to form azaheterocycles from N-carbamate-protected amino alcs. is described. The reaction involves the activation of the hydroxyl group via the use of orthoesters. Despite the reduced nucleophilicity of carbamate nitrogen, this reaction system provides several types of pyrrolidines and piperidines in good to high yields. Using this protocol, prolinol derivatives can also be synthesized from carbamate-protected amino diols with regio- and stereoselectivity. The experimental process involved the reaction of (Trimethoxymethyl)benzene(cas: 707-07-3).Quality Control of (Trimethoxymethyl)benzene

The Article related to carbamate protected amino alc orthoester cyclodehydration, pyrrolidine preparation, piperidine preparation, Heterocyclic Compounds (One Hetero Atom): Pyrroles and Pyrrolizines and other aspects.Quality Control of (Trimethoxymethyl)benzene

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

On March 11, 2021, Han, Jiaming; Liu, Haoyou; Hu, Shen; Qiu, Jingxuan; Guo, Ying; Huang, Haishuang; He, Hui; Wang, Peng published an article.Formula: C4H8ClNOS The title of the article was Solubility Behavior of DL-Homocysteine Thiolactone Hydrochloride in Nine Pure and A Binary Methanol + Acetonitrile Solvent Systems. And the article contained the following:

DL-Homocysteine thiolactone hydrochloride (one of the derivatives of L-cysteine) solubility in nine neat solvents (methanol, ethanol, isopropanol, Et acetate, 1,4-dioxane, acetonitrile, acetone, 2-butanone and dichloromethane) were determined by the static gravimetric method at the atm. pressure from 283.15 to 323.15 K. At the same time, the solubility in methanol + acetonitrile binary solvent system was determined From the result of experiments, the solubility all increased with the increase of the temperature And the polarity is one of the important factors affecting solubility Three-dimensional (3D) Apelblat-Jouyban-Acree model and Apelblat-Machatha model were used for correlating the solubility data and the values calculated by the two thermodn. models were in good agreement with the exptl. data. The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).Formula: C4H8ClNOS

The Article related to homocysteine thiolactone hydrochloride solubility pure binary methanol acetonitrile solvent, Physical Organic Chemistry: Other Reactions, Processes, and Spectra and other aspects.Formula: C4H8ClNOS

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

Sugimura, Takashi; Nakagawa, Satoshi; Kamata, Naoya; Tei, Takahiro; Tajiri, Takashi; Tsukiyama, Ryo-ichi; Okuyama, Tadashi; Okamoto, Yasuaki published an article in 2015, the title of the article was Ligand-acceleration by a chiral modifier in the enantioselective hydrogenation of methyl acetoacetate on a Raney nickel catalyst: effect of a modifier configuration.Quality Control of (R)-Methyl 3-hydroxybutanoate And the article contains the following content:

Reaction rate and enantioselectivity of asym. hydrogenation of Me acetoacetate were studied over Raneynickel catalysts modified with (R,R)-tartaric acid, malic acid, or succinic acid to reveal the impacts of the modifier configuration. Catalysts comodified with two different acids were also examined to confirm the conclusions. From anal. of the enantiomer ratio of the hydrogenation product and initial reaction rate, tartaric acid (TA) was found to have dual functions as the modifier during the hydrogenation; effective suppression of the racemic catalysis on bare Ni surface and extensive enantiodifferentiating ligand acceleration by adsorbed TA. It was demonstrated that each adsorbed chiral modifier mol. independently takes part in the enantiospecific hydrogenation. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Quality Control of (R)-Methyl 3-hydroxybutanoate

The Article related to methyl acetoacetate enantioselective hydrogenation raney nickel chiral ligand configuration, Physical Organic Chemistry: Other Reactions, Processes, and Spectra and other aspects.Quality Control of (R)-Methyl 3-hydroxybutanoate

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

Bekkar, Nour El Houda; Meddah, Boumediene; Keskin, Bahadir; Sonnet, Pascal published an article in 2021, the title of the article was Oral acute toxicity, influence on the gastrointestinal microbiota and in vivo anti-salmonellosis effect of Zizyphus lotus (L.) and Ruta chalepensis (L.) essential oils.Product Details of 85-91-6 And the article contains the following content:

The aim of this study was to evaluate the chem. composition of Zizyphus lotus and Ruta chalepensis essential oils (EOs), the oral acute toxicity, influence on the gastrointestinal microbiota and the in vivo anti-salmonellosis effect. The EOs were isolated using the steam distillation process, and bioactive components were identified by gas chromatog.-mass spectrometry (GC-MS) anal. Oral acute toxicity, influence on the gastrointestinal flora composition and the anti-salmonellosis effect were elucidated using in vivo methods on exptl. animals. The GC-MS allowed us to identify 33 and 58 components in Z. lotus and R. chalepensis, resp. Di-isooctyl phthalate (89.857%) was found to be the major compound identified in Z. lotus. The main compounds in R. chalepensis were 2-undecanone (26.528%) followed by 2-nonanone (13.404%). The LD50 of EOs was found to be greater than 5000 mg/kg. Also, no neg. influence to intestinal microbiota was detected. An important decrease in S. enterica ssp arizonae cells achieving a bactericidal effect was recorded in rats treated with the EOs of both plants at a dose of 400 mg/kg. In parallel, an important significant (P < 0.05) increase in lymphocytes number was observed for all tested animals. A decrease in alk. phosphatase (ALP), amino alanine transferase (ALT) and aspartate aminotransferase (AST) levels was observed Furthermore, a reduced blood erythrocyte sedimentation rate (ESR) was recorded in treated animals. The Z. lotus and R. chalepensis act effectively as anti-salmonellosis agents, which support the use of these plants to cure gastrointestinal infections. The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).Product Details of 85-91-6

The Article related to zizyphus ruta essential oils gastrointestinal microbiota antisalmonellosis oral acute, Microbial, Algal, and Fungal Biochemistry: Composition and Products and other aspects.Product Details of 85-91-6

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

McInnis, Christine E.; Blackwell, Helen E. published an article in 2011, the title of the article was Thiolactone modulators of quorum sensing revealed through library design and screening.Name: 3-Aminodihydrothiophen-2(3H)-one hydrochloride And the article contains the following content:

Quorum sensing (QS) is a process by which bacteria use small mols. or peptidic signals to assess their local population densities. At sufficiently high d., bacteria can alter gene expression levels to regulate group behaviors involved in a range of important and diverse phenotypes, including virulence factor production, biofilm formation, root nodulation, and bioluminescence. Gram-neg. bacteria most commonly use N-acylated L-homoserine lactones (AHLs) as their QS signals. The AHL lactone ring is hydrolyzed relatively rapidly at biol. pH, and the ring-opened product is QS inactive. The authors sought to identify AHL analogs with heightened hydrolytic stability, and thereby potentially heightened activity, for use as non-native modulators of bacterial QS. As part of this effort, they probed the utility of thiolactone analogs in the current study as QS agonists and antagonists in Gram-neg. bacteria. A focused library of thiolactone analogs was designed and rapidly synthesized in solution The authors examined the activity of the library as agonists and antagonists of LuxR-type QS receptors in Pseudomonas aeruginosa (LasR), Vibrio fischeri (LuxR), and Agrobacterium tumefaciens (TraR) using bacterial reporter strains. The thiolactone library contained several highly active compounds, including some of the most active LuxR inhibitors and the most active synthetic TraR agonist reported to date. Anal. of a representative thiolactone analog revealed that its hydrolysis half-life was almost double that of its parent AHL in bacterial growth medium. The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).Name: 3-Aminodihydrothiophen-2(3H)-one hydrochloride

The Article related to thiolactone bacteria quorum sensing, Microbial, Algal, and Fungal Biochemistry: Antimicrobial Sensitivity and other aspects.Name: 3-Aminodihydrothiophen-2(3H)-one hydrochloride

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

Ram, Ram N.; Sadanandan, Sandhya; Kumar Gupta, Dharmendra published an article in 2019, the title of the article was β,β,β-Trichloroethyl-NH-Enamine as Viable System for 5-Endo-trig Radical Cyclization via Multifaceted CuI-CuII Redox Catalysis: Single Step Synthesis of Multi-Functionalized NH-Pyrroles.Product Details of 517-23-7 And the article contains the following content:

A mild and regioselective copper-catalyzed direct synthesis of multi-substituted and functionalized NH-pyrroles was reported in high yields from diverse β,β,β-trichloroethyl-NH-enamines via a novel 5-endo-trig radical cyclization mode, previously known to be unviable in the enamine system. An approach to transform a geometrically ‘disfavored to favored’ 5-endo-trig radical cyclization mode in NH-enamine systems via multifaceted CuI-CuII redox catalysis generating radicals, preventing dehalogenative reduction of radical precursors and dehydrohalogenating the 5-endo-trig cyclized products was demonstrated exptl. With wider substrate scope, this method incorporated halo-, NH- and carbonyl functionalities besides alkyl, aryl and heteroaryl substituents in the pyrrole unit easily. These difficult 3-halo-NH-pyrroles are potential sources for natural products, agrochems., pharmaceuticals and organometallic chem. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Product Details of 517-23-7

The Article related to trichloroethyl enamine preparation copper catalyst regioselective radical cyclization, chloropyrrole preparation green chem, Heterocyclic Compounds (One Hetero Atom): Pyrroles and Pyrrolizines and other aspects.Product Details of 517-23-7

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

On January 31, 2022, Kozma, Viktoria; Szollosi, Gyorgy published an article.Category: esters-buliding-blocks The title of the article was Conjugate addition of 1,3-dicarbonyl compounds to maleimides using bifunctional primary amine-(thio)phosphoramide organocatalysts. And the article contained the following:

Asym. Michael additions of 1,3-dicarbonyl compounds to N-substituted maleimides were carried out using primary amine-(thio)phosphoramide bifunctional chiral organocatalysts derived from optically pure C2-sym. 1,2-diamines. The addition of Et 2-fluoroacetoacetate using the 1,2-diphenylethane-1,2-diamine derived thiophosphoramide catalyst afforded various succinimides substituted with fluorine bearing quaternary carbon in high yields, good diastereomeric ratios and excellent enantiomeric excesses. Alicyclic β-ketoesters provided the diastereomerically pure Michael adducts in good yields and high enantioselectivities, whereas 2,4-pentanedione afforded products with slightly lower enantiomeric excesses. The bulkiness of the N-substituent of the maleimide ring influenced mostly the conversions. The thiophosphoramide catalyst was found also efficient in the addition of Et 2-fluoroacetoacetate to β-nitrostyrenes. Unprecedentedly, during this work the highly enantioselective addition of 1,3-dicarbonyl compounds to maleimides were catalyzed by a primary amine-hydrogen-bond donor groups containing bifunctional organocatalyst. These reactions occurred through enamine intermediate, as evidenced by electrospray-ionization mass spectrometry and NMR spectroscopy. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Category: esters-buliding-blocks

The Article related to maleimide dicarbonyl compound stereoselective conjugate addition, primary amine thio phosphoramide organocatalyst, Heterocyclic Compounds (One Hetero Atom): Pyrroles and Pyrrolizines and other aspects.Category: esters-buliding-blocks

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

On January 31, 2022, Kozma, Viktoria; Szollosi, Gyorgy published an article.Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one The title of the article was Conjugate addition of 1,3-dicarbonyl compounds to maleimides using bifunctional primary amine-(thio)phosphoramide organocatalysts. And the article contained the following:

Asym. Michael additions of 1,3-dicarbonyl compounds to N-substituted maleimides were carried out using primary amine-(thio)phosphoramide bifunctional chiral organocatalysts derived from optically pure C2-sym. 1,2-diamines. The addition of Et 2-fluoroacetoacetate using the 1,2-diphenylethane-1,2-diamine derived thiophosphoramide catalyst afforded various succinimides substituted with fluorine bearing quaternary carbon in high yields, good diastereomeric ratios and excellent enantiomeric excesses. Alicyclic β-ketoesters provided the diastereomerically pure Michael adducts in good yields and high enantioselectivities, whereas 2,4-pentanedione afforded products with slightly lower enantiomeric excesses. The bulkiness of the N-substituent of the maleimide ring influenced mostly the conversions. The thiophosphoramide catalyst was found also efficient in the addition of Et 2-fluoroacetoacetate to β-nitrostyrenes. Unprecedentedly, during this work the highly enantioselective addition of 1,3-dicarbonyl compounds to maleimides were catalyzed by a primary amine-hydrogen-bond donor groups containing bifunctional organocatalyst. These reactions occurred through enamine intermediate, as evidenced by electrospray-ionization mass spectrometry and NMR spectroscopy. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one

The Article related to maleimide dicarbonyl compound stereoselective conjugate addition, primary amine thio phosphoramide organocatalyst, Heterocyclic Compounds (One Hetero Atom): Pyrroles and Pyrrolizines and other aspects.Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one

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

Yu, Lei; Wang, Long-Hai; Hu, Zong-Tao; You, Ye-Zi; Wu, De-Cheng; Hong, Chun-Yan published an article in 2015, the title of the article was Sequential Michael Addition Thiol-Ene And Radical-Mediated Thiol-Ene Reactions In One-Pot Produced Sequence-Ordered Polymers.COA of Formula: C4H8ClNOS And the article contains the following content:

Sequential Michael addition based thiol-ene and free radical mediated thiol-ene reactions for preparing sequence-ordered polymers are reported for the first time. The thiols are produced in situ via the ring-opening of thiolactones, and they can readily react with the electron-deficient carbon-carbon double bond of allyl methacrylate via Michael addition-based thiol-ene, but they are unable to react with the electron-rich carbon-carbon double bond of allyl methacrylate without radicals, and intermediates with thiol and alkene units are formed. After the Michael addition thiol-ene and ring-opening reactions are complete, the thiol is activated by UV irradiation, enabling reaction with the electron-rich carbon-carbon double bond via a free radical-mediated thiol-ene reaction, to form sequence-ordered polymers of high mol. weights The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).COA of Formula: C4H8ClNOS

The Article related to sequence ordered polymer sequential thiol ene click polymerization, Chemistry of Synthetic High Polymers: Organic Addition Polymerization and other aspects.COA of Formula: C4H8ClNOS

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