Category: esters-buliding-blocks

Ding, Wenwu published the artcileFermentation characteristics of Pixian broad bean paste in closed system of gradient steady-state temperature field, Product Details of C11H22O2, the main research area is fermentation Pixian broad bean paste temperature; Correlation; Gradient steady-state temperature field; Microbial communities; Physicochemical factors; Pixian broad bean paste; Volatile components.

A closed system of gradient steady-state temperature field (GSTF) was constructed to ferment Pixian broad bean paste (PBP). The contents of physicochem. factors and organic acids in the fermentation under GSTF (FG) were closer to those in the traditional fermentation (TF). The taste intensities of 8 free amino acids in the FG were higher than those in the constant temperature fermentation (CTF), but 14 in the TF showed the highest among the processes of FG, CTF and TF. The FG product had the most volatiles with 87, and its flavor properties were more stable. The FG produced great effects on the microbe evolutions especially improved the fungal diversity. Bacillus were identified as the core microbes in the FG while the roles of Staphylococcus, Lactobacillus and Pantoea were strengthened. The results indicated that the fermentation characteristics in the FG had been further improved compared with the CTF.

Food Chemistry published new progress about Acetobacter. 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Product Details of C11H22O2.

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

Oosthoek-de Vries, Anna Jo published the artcileInline Reaction Monitoring of Amine-Catalyzed Acetylation of Benzyl Alcohol Using a Microfluidic Stripline Nuclear Magnetic Resonance Setup, Recommanded Product: Benzyl acetate, the main research area is amine catalyzed acetylation benzyl alc microfluidic stripline NMR monitoring.

We present an in-depth study of the acetylation of benzyl alc. in the presence of N,N-diisopropylethylamine (DIPEA) by NMR monitoring of the reaction from 1.5 s to several minutes. We have adapted the NMR setup to be compatible to microreactor technol., scaling down the typical sample volume of com. NMR probes (500 μL) to a microfluidic stripline setup with 150 nL detection volume Inline spectra are obtained to monitor the kinetics and unravel the reaction mechanism of this industrially relevant reaction. The experiments are combined with conventional 2D NMR measurements to identify the reaction products. In addition, we replace DIPEA with triethylamine and pyridine to validate the reaction mechanism for different amine catalysts. In all three acetylation reactions, we find that the acetyl ammonium ion is a key intermediate. The formation of ketene is observed during the first minutes of the reaction when tertiary amines were present. The pyridine-catalyzed reaction proceeds via a different mechanism.

Journal of the American Chemical Society 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

Javaherian, Mohammad published the artcileNano-silica melamine trisulfonic acid as an efficient and reusable heterogeneous catalyst in esterification reactions, Formula: C10H10O2, the main research area is silica melamine trisulfonic acid catalyst esterification reaction.

The use of nano-silica melamine trisulfonic acid as a reusable heterogeneous solid acid catalyst in the esterification reaction of carboxylic acids and alcs. is reported. The reaction conditions were optimized by testing temperature, each component of catalyst, feedstock ratios as well as load of catalyst. The synthesized catalyst was characterized by X-ray diffraction, SEM, Fourier transform IR spectroscopy, and thermogravimetric anal. techniques. The results showed that nano-silica melamine trisulfonic acid was an efficient dehydrating agent in the condensing reactions between different kinds of aliphatic and aromatic carboxylic acids and alcs. The method was simple, rapid, straightforward, catalyst reusability, and holds potential for further application in acid-catalyzed organic synthesis and industrial requirements.

Journal of the Iranian Chemical Society published new progress about Acetylation. 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Formula: C10H10O2.

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

Javaherian, Mohammad published the artcileNano-silica melamine trisulfonic acid as an efficient and reusable heterogeneous catalyst in esterification reactions, Quality Control of 140-11-4, the main research area is silica melamine trisulfonic acid catalyst esterification reaction.

The use of nano-silica melamine trisulfonic acid as a reusable heterogeneous solid acid catalyst in the esterification reaction of carboxylic acids and alcs. is reported. The reaction conditions were optimized by testing temperature, each component of catalyst, feedstock ratios as well as load of catalyst. The synthesized catalyst was characterized by X-ray diffraction, SEM, Fourier transform IR spectroscopy, and thermogravimetric anal. techniques. The results showed that nano-silica melamine trisulfonic acid was an efficient dehydrating agent in the condensing reactions between different kinds of aliphatic and aromatic carboxylic acids and alcs. The method was simple, rapid, straightforward, catalyst reusability, and holds potential for further application in acid-catalyzed organic synthesis and industrial requirements.

Journal of the Iranian Chemical Society 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

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

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

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

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, 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

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