Category: esters-buliding-blocks

Hoseini, L. published the artcileEffect of the Amount of BaO Catalyst on the Selective Acetylation of Benzyl Alcohols and Doxycycline Degradation, Recommanded Product: Benzyl acetate, the main research area is benzyl alc selective acetylation barium oxide nanocatalyst doxycycline degradation.

In this study, BaO nanoflower-like was prepared by using a template and identified using a variety of techniques. The sample was characterized by XRD measurements, SEM, diffuse reflectance spectroscopy (DRS) and energy dispersive X-ray spectroscopy (EDX). The catalytic activity of BaO system in the acetylation of alcs. was studied. The formation of products proceeds on the catalysts with predominantly strong basic sites. This catalyst is inexpensive and easy to handle, and the acetylation of hydroxyl groups using this catalyst only required a low loading of the catalyst. The catalytic degradation of doxycycline has been investigated in aqueous phase using MgO and BaO nanostructures.

Chemistry Africa published new progress about Acetylation. 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

Ghosh, Topi published the artcileHybrid Cobalt Doped-Cerium Oxide as a Multifunctional Nanocatalyst for Various Organic Transformations, Recommanded Product: Benzyl acetate, the main research area is cobalt cerium oxide nanocatalyst organic.

Development of a low-cost, environmentally benign and robust catalyst for multipurpose industrially relevant organic transformations is highly desirable for the sustainable future of chem. industries. A hybrid cobalt doped-cerium oxide nanocatalyst (Co@CeO2NC) was prepared via simple coprecipitation method using water as the solvent. The characterization of Co@CeO2NC was performed using different techniques such as XRD, TGA, FE-SEM, HR-TEM, EDAX-mapping, BET, and XPS anal. The structural characterization of the prepared sample by XRD and XPS anal. revealed the presence of the mixed phase of cobalt oxide and cobalt doped-cerium oxide as a hybrid (Co@CeO2NC). Industrially relevant organic transformations such as (i) nitrile formation using aldehyde with hydroxylamine hydrochloride, (ii) reductive amination of aldehydes to form tertiary N,N-di-Me amines, and (iii) direct acetylation of alcs./amines with acetic acid were achieved in an excellent manner using Co@CeO2NC hybrid as the multifunctional catalyst. Excellent catalytic activity of Co@CeO2NC was noticed for the conversion of 4-chlorobenzaldehyde to 4-chlorobenzonitrile with 99% conversion and 99% selectivity and 100% conversion of benzaldehyde to N,N-dimethylbenzylamine using DMF as NMe2 source, reductant, and solvent. Moreover, acetylation of 4-methoxybenzyl alc. and 2-Me aniline gave excellent conversion and selectivity toward the formation of -O and -N acetyl. The scope of the Co@CeO2NC was further evaluated for other aldehydes, alcs., and amines with an excellent conversion and high selectivity.

ACS Sustainable Chemistry & Engineering published new progress about Acetylation. 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

Poulin, Jennifer published the artcileDirect Inlet Py-GC-MS analysis of cultural heritage materials, Quality Control of 929-77-1, the main research area is inlet PyGCMS analysis cultural heritage material.

Pyrolysis-gas chromatog.-mass spectrometry (Py-GC-MS) is an invaluable tool in the anal. of cultural heritage materials, particularly those containing complex polymerized components, whether natural or synthetic in origin. As the field embraces non-destructive and micro-sampling anal., it is not always possible to perform traditional flash Py-GC-MS due to the sample size requirements of the technique, which are typically in the range of 50-100 μg. The development of a pyrolysis method using a Thermal Separation Probe (Agilent Technologies Inc.) has allowed for splitless Py-GC-MS anal. to be carried out on much smaller samples. This technique makes use of a multi-mode inlet that is capable of rapidly heating to 450 °C. Because pyrolysis takes place within the inlet, the methodol. has been designated Direct Inlet Pyrolysis (DIP). Examples of synthetic reference materials, as well as case studies of archaeol. residues and a varnish from the 1960 s were employed to demonstrate this adapted anal. technique. The results obtained using DIP-GC-MS were compared to published thermal degradation data and higher-temperature flash Py-GC-MS chromatograms. The results indicate that DIP-GC-MS can characterize the organic fraction of complex polymeric samples. Differences in pyrolyzate formation and relative abundance occur for some polymers which are caused by lower and prolonged pyrolysis conditions. The technique can be performed in splitless mode with just a few micrograms of precious sample from cultural heritage objects, or by employing a low split if desired for more abundant reference materials. Like other Py-GC-MS methods, the online use of a reagent such as tetramethylammonium hydroxide (TMAH) allows for the derivatisation of polar functional groups.

Journal of Analytical and Applied Pyrolysis published new progress about Acetylation. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Quality Control of 929-77-1.

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

Rajitha, Nampally published the artcileAcetylation of phenols, alcohols and amines catalyzed by mono ammonium salt of 12-tungstophosphoric acid under ambient conditions, Computed Properties of 140-11-4, the main research area is phenol alc amine catalyst tungstophosphoric acid monoammonium salt acetylation.

A simple, highly rapid and efficient method is developed for the acetylation of phenols, alcs. and amines with excellent yield using monoammonium salt of 12-Tungstophosphoric acid [(NH4)H2PW12O40] as a solid phase catalyst under ambient conditions. The salient features of this hetero polyacid catalyst are simple workup procedure, short reaction time, insoluble both in protic and aprotic solvents, high yield and reusable nature.

Journal of Applicable Chemistry (Lumami, India) published new progress about Acetylation. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Computed Properties of 140-11-4.

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

Zaccone, Ferdinando published the artcileAn Alternative Enzymatic Route to the Ergogenic Ketone Body Ester (R)-3-Hydroxybutyl (R)-3-Hydroxybutyrate, Related Products of esters-buliding-blocks, the main research area is esterhydroxybutylhydroxybutyrate ergogenic ketone body alternative enzymic route.

Recent studies have highlighted the therapeutic and ergogenic potential of the ketone body ester, (R)-3-hydroxybutyl-(R)-3-hydroxybutyrate. In the present work, the enzymic synthesis of this biol. active compound is reported. The (R)-3-hydroxybutyl-(R)-3-hydroxybutyrate has been produced through the transesterification of racemic Et 3-hydroxybutyrate with (R)-1,3-butanediol by exploiting the selectivity of Candida antarctica lipase B (CAL-B). The needed (R)-1,3-butanediol was in turn obtained from the kinetic resolution of the racemate achieved by acetylation with vinyl acetate, also in this case, thanks to the enantioselectivity of the CAL-B used as catalyst. Finally, the stereochem. inversion of the unreacted (S) enantiomers of the Et 3-hydroxybutyate and 1,3- butanediol accomplished by known procedure allowed to increase the overall yield of the synthetic pathway by incorporating up to 70% of the starting racemic reagents into the final product.

Catalysts published new progress about Acetylation. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Related Products of esters-buliding-blocks.

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

Valentini, Francesca published the artcileA stoichiometric solvent-free protocol for acetylation reactions, Formula: C9H10O2, the main research area is acetylation reaction stoichiometric solvent free protocol; acetic anhydride; acetylation; alcohols; isopropenyl acetate; phenols; sustainability; thiols; thymol.

Considering the remarkable relevance of acetylated derivatives of phenols, alcs., and aryl and alkyl thiols in different areas of biol., as well as in synthetic organic chem., a sustainable solvent-free approach to perform acetylation reactions is proposed here. Acetylation reactions are classically performed using excess of acetic anhydride (Ac2O) in solvent-free conditions or by eventually working with stoichiometric amounts of Ac2O in organic solvents; both methods require the addition of basic or acid catalysts to promote the esterification. Therefore, they usually lead to the generation of high amounts of wastes, which sensibly raise the E-factor of the process. With the aim to develop a more sustainable system, a solvent-free, stoichiometric acetylation protocol is, thus, proposed. The naturally occurring phenol, thymol, can be converted to the corresponding-biol. active-ester with good yields, in the presence of 1% of VOSO4. Interestingly, the process can be efficiently adopted to synthesize other thymyl esters, as well as to perform acetylation of alcs. and aryl and alkyl thiols. Remarkably, a further improvement has been achieved replacing Ac2O with its greener alternative, isopropenyl acetate (IPA).

Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Acetylation. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Formula: C9H10O2.

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

Barnes, Christopher published the artcileOrigins of N-formylmethamphetamine and N-acetylmethamphetamine in methamphetamine produced by the hydriodic acid and red phosphorus reduction of pseudoephedrine, Synthetic Route of 140-11-4, the main research area is forensic pseudoephedrine hydriodic acid red phosphorus methamphetamine.

FMA and AMA are suspected to be trace byproducts in methamphetamine (MA) produced from pseudoephedrine using the Nagai reaction. FMA is an intermediate in the synthesis of MA using the Leuckart reaction. However, as there is the possibility that FMA is a byproduct of the Nagai reaction, the significance of FMA as an indicator of the Leuckart reaction has been debated. It is therefore important to establish whether AMA and especially FMA are byproducts of the Nagai reaction and thus establish their significance as synthetic route markers. From the work presented here, FMA is a byproduct of the Nagai reaction but the mechanism by which FMA arises could be not determined AMA was also shown to be a byproduct of the Nagai reaction, most likely due to reaction between MA and phenyl-2-propanone (P-2-P), itself a byproduct of the Nagai reaction. Furthermore, during GC anal. of Nagai reaction products, MA has been shown to react with P-2-P or Et acetate in the injector to form AMA. Caution is recommended if the relative abundance of AMA and/or FMA are used as a basis for determining whether MA samples have a common source or not. Furthermore, it is clear that FMA cannot be considered to be a route-specific byproduct for the Leuckart reaction – it is the abundance of FMA in a reaction mixture or profile, not simply its presence, that points to the involvement of the Leuckart reaction.

Forensic Chemistry published new progress about Acetylation. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Synthetic Route of 140-11-4.

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

Pantawane, Amit Ravindra published the artcileMild and Efficient Tunable Bronsted Acidic Ionic Liquid Catalyzed O-Acetylation and O-Trimethylsilylation with Trimethylsilyl Acetate (TMSOAc) and Hexamethyldisilazane (HMDS), Quality Control of 140-11-4, the main research area is Bronsted acidic ionic liquid acetylation trimethylsilylation trimethylsilyl acetate hexamethyldisilazane.

This report discloses a mild and efficient O-acetylation using easily accessible TMSOAc as a novel acetyl reagent and O-trimethylsilylation using HMDS for various alcs. catalyzed by tunable Bronsted acidic ionic liquids (TBAILs). Imidazolium-based TBAILs were prepared by a two-step atom-economic reaction and acidities measured by using UV-visible spectroscopy. Both protections for alcs. were accomplished at room temperature with good to excellent yields, while the products and TBAILs were separated by simple work-up for O-silylation and column chromatog. for O-acetylation. Notably, with the simple post-process, TBAILs catalyst in this solvent free method easily recovered and recycled several times without significant degradation

Catalysts published new progress about Acetylation. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Quality Control of 140-11-4.

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

Limmatvapirat, Chutima published the artcileBeef tallow: extraction, physicochemical property, fatty acid composition, antioxidant activity, and formulation of lotion bars, Quality Control of 110-42-9, the main research area is beef tallow extraction lotion bar fatty acid antioxidant skincare.

The objective of this study was to transform beef adipose tissues into tallow for the production of lotion bars. This study managed to evaluate the influence of various rendering methods on the yields, physicochem. properties, fatty acid composition, and antioxidant activities of tallow. All obtained tallow samples were found to possess saponification values, acid values, peroxide values, refractive indexes, heavy metal contents, and microbial contamination within the acceptable limits. The results also revealed that the low-temperature (LT) rendering method was the most effective method for preparation of tallow and the soft fat (SF) had a higher unsaturated fatty acid content and stronger antioxidant activity than hard fat. Due to the highest content of unsaturated fatty acids and antioxidant activity of tallow prepared from SF extracted with the LT rendering method, it was used as an active ingredient in lotion bars. The optimized lotion bars were characterized by hardness, homogeneity, color, microbial loads, and heavy metal contents. The nongreasy lotion bar containing 40% weight/weight beef tallow was proved to be stable under heating-cooling cycle stability testing. Thus, qualified beef tallow together with shea butter and bee wax can be utilized to produce lotion bars.

Journal of Applied Pharmaceutical Science published new progress about Acid number. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Quality Control of 110-42-9.

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

Pryde, David C. published the artcileThe discovery of potent small molecule activators of human STING, Safety of Ethyl 2-hydroxyacetate, the main research area is human STING activator preparation oxindole benzothiazine quinoline oxazine benzazepine; Cytokines; Immunotherapy; Interferon genes; STING.

The adaptor protein STING plays a major role in innate immune sensing of cytosolic nucleic acids, by triggering a robust interferon response. Despite the importance of this protein as a potential therapeutic target for serious unmet medical conditions including cancer and infectious disease there remains a paucity of STING ligands. Starting with a benzothiazinone series of weak STING activators (human EC50 ∼10μM) we identified several chemotypes with sub-micromolar STING activity across all the major protein polymorphs. An example compound I, based on an oxindole core structure, demonstrated robust on-target functional activation of STING (human EC50 185 nM) in immortalized and primary cells and a cytokine induction fingerprint consistent with STING activation. Our study has identified several related series of potent small mol. human STING activators with potential to be developed as immunomodulatory therapeutics.

European Journal of Medicinal Chemistry published new progress about Homo sapiens. 623-50-7 belongs to class esters-buliding-blocks, name is Ethyl 2-hydroxyacetate, and the molecular formula is C4H8O3, Safety of Ethyl 2-hydroxyacetate.

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