Tag: M.W=150-200

Toyao, Takashi published the artcileEsterification of Tertiary Amides by Alcohols Through C-N Bond Cleavage over CeO2, Related Products of esters-buliding-blocks, the main research area is tertiary amide aliphatic alc reusable cerium dioxide nanocatalyst esterification; ester preparation green chem.

CeO2 was found to promote ester forming alcoholysis reactions of tertiary amides. The present catalytic system was operationally simple, recyclable and it does not require additives. The esterification process displayed a wide substrate scope (>45 examples; up to 93 % isolated yield). Results of a d. functional theory (DFT) study combined with in-situ FT-IR observations indicated that the process proceeded through rate limiting addition of a CeO2 lattice oxygen to the carbonyl group of the adsorbed acetamide species with energy barrier of 17.0 kcal/mol. This value matched well with exptl. value (17.9 kcal/mol) obtained from anal. of the Arrhenius plot. Further studies by in-situ FT-IR and temperature programmed desorption using probe mols. demonstrated that both acidic and basic properties were important and consequently, CeO2 showed the best performance for the C-N bond cleavage reaction.

ChemCatChem published new progress about Aliphatic alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Related Products of esters-buliding-blocks.

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

Baky, Mostafa H. published the artcileMetabolome-Based Analysis of Herbal Cough Preparations Via Headspace Solid-Phase Microextraction GC/MS and Multivariate Data Analyses: A Prospect for Its Essential Oil Equivalency, HPLC of Formula: 123-29-5, the main research area is metabolome analysis herbal cough headspace microextraction GC MS.

Liquid cough preparations containing essential oils pose a challenge for isolating and quantifying their volatile components from such a complex matrix enriched with nonvolatile constituents and excipients. This study aims to develop a strategy integrating QC anal. of seven natural cough preparations in the Egyptian market and to assess volatile variation among the preparations using multivariate data analyses. Cough preparations were subjected to headspace solid-phase microextraction (HS-SPME) for determination of their essential oil composition mediating for their actions and to assess volatile differences among them. HS-SPME is a suitable technique for sample preparation that allows for extraction and enrichment of volatiles from complex nonvolatile matrixes and their direct desorption into the gas chromatog. anal. system. A total of 88 volatile components were identified belonging to seven classes, viz. aromatics, aliphatic hydrocarbons, mono/sesquiterpene hydrocarbons, and oxygenated mono/sesquiterpenes. Oxygenated monoterpenes, viz., menthol, cineole, thymol, and (E)-anethole, were the major volatiles identified in five cough preparations (79.5-98.6%), whereas aromatics, chiefly cinnamate derivatives, constituted the second class amounting for 50.5 and 27.4% in the other two cough preparations Meaningful results regarding the products’ efficacy and safety were extrapolated from this anal. procedure, where artificial preservatives (parabens) were detected in five cough preparations This study established an efficient strategy for exploring volatile profiling and defining different markers among the different cough preparations Addnl., authenticity of listed herbal ingredients in the cough preparations was also confirmed in certain preparations, while other formulations failed to show representative volatile components. Volatile variation among preparations was assessed using multivariate data analyses in an attempt to prioritize cough preparations for usage, suggesting the preference of Bronchicum and Babetone among examined cough products.

ACS Omega published new progress about Aliphatic hydrocarbons Role: ANT (Analyte), ANST (Analytical Study). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, HPLC of Formula: 123-29-5.

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

Shao, Yan published the artcileComposition and profiles of volatile organic compounds during waste decomposition by the anaerobic bacteria purified from landfill, Application In Synthesis of 111-11-5, the main research area is volatile organic compound waste decomposition anaerobic bacteria landfill; Anaerobic bacteria; Concentration variation; Landfill gas; VOCs; Waste degradation.

Volatile organic compounds (VOCs) become concerned pollutants in landfill gases, and their composition and concentration varied significantly during waste decomposition Many environmental factors are known to affect VOC emissions, while the effect of indigenous bacteria in wastes on VOC production remains elusive. In this study, a simplified anaerobic degradation experiment, with the single substrate and the purified bacteria from a landfill, was set up to measure the degradation process and the dynamic changes of VOCs. The experiment excluded the abiotic factors for VOC variation. The two isolated bacteria, identified as Sporanaerobacter acetigenes and Clostridium sporogenes, could anaerobically ferment amino acids by Stickland reaction. They produced 51 and 57 species of VOCs in the experiment, resp. The concentration changes of VOCs over bacterial growth and fermentation were clustered into four types by principal component anal.: three profiles were regular, similar to the variation of nitrate, hydrogen sulfide, and the major fermentation products (carbon dioxide, ammonium, and volatile organic acids), resp.; while one profile was unique to any degradation indicator. The various concentration profiles indicated different origins for VOCs, possibly from the extracellular environment, fermentation, and secondary reactions. The findings provide insights into the understanding of VOC diversity and variability during waste decomposition

Waste Management (Oxford, United Kingdom) published new progress about Amino acids Role: OCU (Occurrence, Unclassified), OCCU (Occurrence). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application In Synthesis of 111-11-5.

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

Kalla, Reddi Mohan Naidu published the artcileAcylation of Phenols, Alcohols, Thiols, Amines and Aldehydes Using Sulfonic Acid Functionalized Hyper-Cross-Linked Poly(2-naphthol) as a Solid Acid Catalyst, Recommanded Product: Benzyl acetate, the main research area is crosslinked sulfonated polynaphthol porous polymer catalyst preparation property; thiol amine aldehyde acylation.

The hyper-cross-linked porous poly(2-naphthol) fabricated by the Friedel-Crafts alkylation of 2-naphthol has been functionalized with sulfonic acid to obtain a solid acid catalyst. The catalyst is applied for the protection of phenol, alcs., thiols, amines and aldehydes with acetic anhydride at room temperature The catalytic protection using the new solid acid is featured by achieving high yield at neat condition, needing no aqueous work-up and/or chromatog. separation, and showing excellent recycling efficiency, suggesting the potential of this sulfonated porous polymers as a new protection protocol in a wide range of sustainable chem. reactions.

Catalysis Letters published new progress about Acetanilides Role: SPN (Synthetic Preparation), PREP (Preparation). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

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

Sieger, Simon V. published the artcileHydrofunctionalization of Propadiene – New Life for a Previously Unwanted Product, Synthetic Route of 583-04-0, the main research area is nucleophile propadiene palladium catalyst allylation; allyl preparation.

A highly versatile palladium-catalyzed allylation reaction of several pronucleophiles was reported. The use of propadiene in toluene provides an atom economic and waste-free access to allylated nucleophiles, a structural motif with almost unlimited possibilities for further functionalization. In addition to N-, O- and S-pronucleophiles, the Pd/BINAP system was capable of adding a C-pronuceophile to allene. A plausible mechanism was supported by deuterium labeling experiments

ACS Catalysis published new progress about Allyl amines Role: SPN (Synthetic Preparation), PREP (Preparation). 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Synthetic Route of 583-04-0.

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

Yadav, Suresh Kumar published the artcileCobalt(III)-Catalyzed Regioselective [4 + 2]-Annulation of N-Chlorobenzamides with Substituted Alkenes, Application In Synthesis of 583-04-0, the main research area is dihydroisoquinolinone regioselective preparation; chlorobenzamide allylic compound annulation cobalt catalyst.

Synthesis of 3,4-dihydroisoquinolinone derivatives I [R1 = H, 6-Me, 7-Cl, etc.; R2 = S(O)2Ph, OPh, CN, etc.] via Co(III)-catalyzed redox-neutral [4 + 2] annulation of N-chlorobenzamides/acrylamides with substituted alkenes at ambient temperature in good yields was demonstrated. Intriguingly, the synthetically useful functional group of allylic coupling partners such as sulfonyl, carbonate, acetate, phosphate, amide, nitrile, and silane were retained in the final cyclized product. The present annulation reaction was compatible with various substituted benzamides and allylic coupling partners. To support the proposed reaction mechanism, competition experiments, deuterium labeling studies, and kinetic isotope effect studies were performed.

Journal of Organic Chemistry published new progress about Allylic compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Application In Synthesis of 583-04-0.

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

Miyazawa, Toshifumi published the artcileResolution of non-protein amino acids via microbial protease-catalyzed ester hydrolysis: marked enhancement of enantioselectivity by the use of esters with longer alkyl chains and at low temperature, Category: esters-buliding-blocks, the main research area is enzymic resolution amino acid alkyl ester; enantioselectivity enhancement hydrolysis amino acid ester.

In the microbial protease-catalyzed hydrolysis of amino acid esters with the free α-amino group, the enantioselectivity can be enhanced greatly by employing esters with longer alkyl chains such as the iso-Bu ester instead of the conventional Me ester and by conducting the reaction at low temperature

Tetrahedron: Asymmetry published new progress about Amino acid esters Role: RCT (Reactant), RACT (Reactant or Reagent). 10047-10-6 belongs to class esters-buliding-blocks, name is Methyl 2-aminopentanoate hydrochloride, and the molecular formula is C6H14ClNO2, Category: esters-buliding-blocks.

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

Pollack, Scott R. published the artcileMetal-free stereoselective synthesis of (E)- and (Z)-N-monosubstituted β-aminoacrylates via condensation reactions of carbamates, Formula: C7H13NO3, the main research area is carbamate alkoxyacrylate acid catalyst metal free diastereoselective condensation reaction; dialkoxypropanoate carbamate acid catalyst metal free diastereoselective condensation reaction; propynoate carbamate base catalyst diastereoselective condensation reaction; aminoacrylate preparation stereoselective metal free.

Two efficient, stereoselective methods for the preparation of (E)- or (Z)-β-aminoacrylates via acid- or base-promoted condensation reactions of carbamates are described. The base-promoted reaction is E-selective, while acid catalysis can, through the choice of solvent, selectively form E or Z. The acid-catalyzed E-selective process proceeds through a crystallization obviating the need for chromatog. purification

Journal of Organic Chemistry published new progress about Amino esters Role: SPN (Synthetic Preparation), PREP (Preparation). 120157-98-4 belongs to class esters-buliding-blocks, name is tert-Butyl acetylcarbamate, and the molecular formula is C7H13NO3, Formula: C7H13NO3.

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

Cai, Wen-Qiang published the artcileNi-Catalyzed Enantioselective Benzylation of Secondary Phosphine Oxide, HPLC of Formula: 140-11-4, the main research area is crystal structure mol tertiary phosphine oxide stereogenic preparation; nickel catalyzed stereoselective benzylation secondary phosphine oxide.

A nickel-catalyzed benzylic substitution of secondary phosphine oxide was described, affording the dialkylated P-stereogenic tertiary phosphine oxides with high to excellent enantioselectivities. The reaction was performed under mild conditions with com. available benzyl chlorides and bench stable secondary phosphine oxides, exhibiting broad functional group tolerance. It represented a practical example for the preparation of P-stereogenic phosphine compounds

Organic Letters published new progress about Aralkyl chlorides Role: RCT (Reactant), RACT (Reactant or Reagent). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, HPLC of Formula: 140-11-4.

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

Ruiz-Moyano, Santiago published the artcileSelection and application of antifungal VOCs-producing yeasts as biocontrol agents of grey mould in fruits, Recommanded Product: Benzyl acetate, the main research area is antifungal volatile compound yeast gray mold fruit; Antifungal volatile compounds; Botrytis cinerea; Cherry; Postharvest; Strawberry.

Rotting caused by gray mold (Botrytis cinerea) is a concerning disease for numerous crops both pre- and postharvest stages. Application of antagonistic yeasts is a promising strategy for controlling gray mold incidence which could mitigate undesirable consequences of using synthetic fungicides. In this work, a screening for detection of yeasts isolated from figs producers of antifungal volatile organic compounds (VOCs) were performed by confrontation in double dishes systems. Eleven out of 34 yeasts confronted reduced B. cinerea growth parameter in vitro. This reduction was correlated (p ≤ 0.050) with the production of 10 volatile compounds: two acids (acetic acid and octanoic acid), 7 esters (Et propionate, n-Pr acetate, Iso-Bu acetate, 2-methylbutyl acetate, furfuryl acetate, phenylmethyl acetate, 2-phenylethyl acetate) and one ketone (Heptan-2-one). In bases on in vitro assay, Hanseniaspora uvarum 793 was applied to in vivo assays with strawberries and cherries. The reduction of incidence of B. cinerea in strawberries at 7°C and 25°C was 54.9 and 72.1% after 6 and 3 days, resp. The reduction of incidence of B. cinerea in cherries at 7°C and 25°C was 48.9 and 45.6% after 5 and 4 days, resp. These results showed that VOCs produced by Hanseniaspora uvarum 793 are effective in the control of incidence of Botrytis cinerea in fruits, being a potential alternative to chem. fungicide.

Food Microbiology published new progress about Acyclic hydrocarbons Role: ANT (Analyte), ANST (Analytical Study). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

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