Month: December 2022

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

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

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

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

Eddine, Naoures J. published the artcileIron (III) Chloride Hexahydrate as a Highly Efficient Catalyst for Acetylation of Protic Nucleophiles with Acetic Anhydride under Solvent-free Conditions, Safety of Benzyl acetate, the main research area is iron chloride hexahydrate catalyst acetylation protic nucleophile acetic anhydride; solvent free condition.

Acetylation of protic nucleophiles is used to protect these functional groups. Most of the methods described in the literature use solvents, one or more equivalent of toxic bases or expensive and toxic catalysts. Therefore, new methodologies, above all, greener and more economical procedures, are still in demand. An eco-efficient method was developed for the acetylation of alcs., phenols, thiols, amines, and carbohydrates, using acetic anhydride and a catalytic amount of the environmentally benign and inexpensive FeCl3.6H2O under solvent-free conditions. Acetylation of a variety of protic nucleophiles was performed using 0.2 mol % of FeCl3.6H2O as the catalyst, and 1.2 equiv of Ac2O as the acetylating agent at room temperature and under solvent-free conditions. This procedure appears to be highly efficient and promoted rapid and quant. acetylation under simple and min. manipulation. Chromatog. or recrystallization was generally not necessary for the purification of products. This eco-friendly protocol appears to be potentially universally applicable in organic design to protect protic nucleophiles and isscalable for industrial fields.

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

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

Valera, Maria Jose published the artcileWine Aroma Characterization of the Two Main Fermentation Yeast Species of the Apiculate Genus Hanseniaspora, Product Details of C10H20O2, the main research area is Hanseniaspora apiculate genus wine aroma fermentation yeast species.

Hanseniaspora species are the main yeasts isolated from grapes and grape musts. Regarding genetic and phenotypical characterization, especially fermentative behavior, they can be classified in two technol. clusters: the fruit group and the fermentation group. Among the species belonging to the last group, Hanseniaspora osmophila and Hanseniaspora vineae have been previously isolated in spontaneous fermentations of grape must. In this work, the oenol. aptitudes of the two species of the fermentation group were compared with Saccharomyces cerevisiae and the main species of the fruit group, Hanseniaspora uvarum. Both H. osmophila and H. vineae conferred a pos. aroma to final wines and no sensory defects were detected. Wines fermented with H. vineae presented significantly higher concentrations of 2-phenylethyl, tryptophol and tyrosol acetates, acetoin, mevalonolactone, and benzyl alc. compared to H. osmophila. Sensorial anal. showed increased intensity of fruity and flowery notes in wines vinificated with H. vineae. In an evolutionary context, the detoxification of alcs. through a highly acetylation capacity might explain an adaptation to fermentative environments. It was concluded that, although H. vineae show close alc. fermentation adaptations to H. osmophila, the increased activation of phenylpropanoid metabolic pathway is a particular characteristic of H. vineae within this important apiculate genus.

Fermentation published new progress about Acetylation. 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Product Details of C10H20O2.

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

Valera, Maria Jose published the artcileWine Aroma Characterization of the Two Main Fermentation Yeast Species of the Apiculate Genus Hanseniaspora, Quality Control of 5405-41-4, the main research area is Hanseniaspora apiculate genus wine aroma fermentation yeast species.

Hanseniaspora species are the main yeasts isolated from grapes and grape musts. Regarding genetic and phenotypical characterization, especially fermentative behavior, they can be classified in two technol. clusters: the fruit group and the fermentation group. Among the species belonging to the last group, Hanseniaspora osmophila and Hanseniaspora vineae have been previously isolated in spontaneous fermentations of grape must. In this work, the oenol. aptitudes of the two species of the fermentation group were compared with Saccharomyces cerevisiae and the main species of the fruit group, Hanseniaspora uvarum. Both H. osmophila and H. vineae conferred a pos. aroma to final wines and no sensory defects were detected. Wines fermented with H. vineae presented significantly higher concentrations of 2-phenylethyl, tryptophol and tyrosol acetates, acetoin, mevalonolactone, and benzyl alc. compared to H. osmophila. Sensorial anal. showed increased intensity of fruity and flowery notes in wines vinificated with H. vineae. In an evolutionary context, the detoxification of alcs. through a highly acetylation capacity might explain an adaptation to fermentative environments. It was concluded that, although H. vineae show close alc. fermentation adaptations to H. osmophila, the increased activation of phenylpropanoid metabolic pathway is a particular characteristic of H. vineae within this important apiculate genus.

Fermentation 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, Quality Control of 5405-41-4.

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

Valera, Maria Jose published the artcileWine Aroma Characterization of the Two Main Fermentation Yeast Species of the Apiculate Genus Hanseniaspora, Related Products of esters-buliding-blocks, the main research area is Hanseniaspora apiculate genus wine aroma fermentation yeast species.

Hanseniaspora species are the main yeasts isolated from grapes and grape musts. Regarding genetic and phenotypical characterization, especially fermentative behavior, they can be classified in two technol. clusters: the fruit group and the fermentation group. Among the species belonging to the last group, Hanseniaspora osmophila and Hanseniaspora vineae have been previously isolated in spontaneous fermentations of grape must. In this work, the oenol. aptitudes of the two species of the fermentation group were compared with Saccharomyces cerevisiae and the main species of the fruit group, Hanseniaspora uvarum. Both H. osmophila and H. vineae conferred a pos. aroma to final wines and no sensory defects were detected. Wines fermented with H. vineae presented significantly higher concentrations of 2-phenylethyl, tryptophol and tyrosol acetates, acetoin, mevalonolactone, and benzyl alc. compared to H. osmophila. Sensorial anal. showed increased intensity of fruity and flowery notes in wines vinificated with H. vineae. In an evolutionary context, the detoxification of alcs. through a highly acetylation capacity might explain an adaptation to fermentative environments. It was concluded that, although H. vineae show close alc. fermentation adaptations to H. osmophila, the increased activation of phenylpropanoid metabolic pathway is a particular characteristic of H. vineae within this important apiculate genus.

Fermentation published new progress about Acetylation. 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, Related Products of esters-buliding-blocks.

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

Khaligh, Nader Ghaffari published the artcile4-Imidazol-1-yl-butane-1-sulfonic acid ionic liquid: Synthesis, structural analysis, physical properties and catalytic application as dual solvent-catalyst, Product Details of C9H10O2, the main research area is imidazolylbutanesulfonic acid ionic liquid preparation solvent catalyst property; acetylation alc phenol thiol amine tocopherol green chem.

4-Imidazol-1-yl-butane-1-sulfonic acid (ImBu-SO3H) has been successfully synthesized and fully characterized by FT-IR and high-resolution NMR spectroscopy (1H, 13C). The “”plausible”” alternative structures of ImBu-SO3H were discussed on the basis of its NMR data. The ionic liquid showed interesting dual solvent-catalyst property, which was studied exptl. for the acetylation of a variety of functionalized alcs., phenols, thiols, amines and α-tocopherol (α-CTP) as the most active form of vitamin E with acetic anhydride and which provided good yields within a short reaction time. ImBu-SO3H was successfully recycled by product extraction with an average recovered yield of 82% for 5 subsequent runs. The catalytic activity of the recycled ImBu-SO3H showed almost no loss even after five consecutive runs.

Phosphorus, Sulfur and Silicon and the Related Elements published new progress about Acetylation. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Product Details of C9H10O2.

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

Veisi, Hojat published the artcileFe3O4@PEG core/shell nanoparticles as magnetic nanocatalyst for acetylation of amines and alcohols using ultrasound irradiations under solvent-free conditions, Computed Properties of 140-11-4, the main research area is iron oxide polyoxyethylene core shell nanoparticle magnetic nanocatalyst acetylation; alc acetylation catalyst mangetic nanocomposte green.

Ultrasound irradiation was used to prepare one-pot Fe3O4@PEG core/shell nanostructure for the first time. The morphol., structure, and physicochem. properties were specified by different anal. techniques including field emission SEM, Fourier transform IR spectroscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray powder diffraction, and vibrating sample magnetometer. For acetylation of phenols, alcs., and amines, the synthesized Fe3O4@PEG core/shell nanoparticles were used as an efficient heterogeneous and green catalyst with acetic anhydride under sonication applying mild reaction conditions. Different electron-withdrawing and electron-donating substrates indicate a prominent yield of desired products with the merit of reusability of Fe3O4@PEG nanocatalyst and magnetic separation

Research on Chemical Intermediates 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