Tag: M.W=150-200

Kayahara, Eiichi published the artcileGeneration of Carbanions through Stibine-Metal and Bismuthine-Metal Exchange Reactions and Its Applications to Precision Synthesis of ω-End-Functionalized Polymers, Related Products of esters-buliding-blocks, the main research area is stibine metal exchange reaction carbanion generation; polyhydroxyethyl methacrylate terminal functionalization stibine metal exchange reaction; polyisopropylacrylamide terminal functionalization stibine metal exchange reaction; polybutyl acrylate terminal functionalization stibine metal exchange reaction; PMMA terminal functionalization stibine metal exchange reaction; magnesium stibine exchange reaction carbanion generation; zinc stibine exchange reaction carbanion generation; bismuthine metal exchange reaction carbanion generation; lithium stibine exchange reaction carbanion generation.

Generation of carbanions from organostibines and organobismuthines through heteroatom-metal exchange reactions was examined from synthetic and mechanistic viewpoints. The exchange reaction proceeded spontaneously upon treatment with various organometallic reagents, such as alkyllithiums, tetraalkylzincates, and alkylmagnesium halides to afford the corresponding carbanions quant. Due to the high reactivity of these heteroatom compounds, the exchange reactions took place exclusively even in the presence of various polar functional groups, which potentially react with organometallic species. The advantage of this method was exemplified by the end-group transformation of living polymers that bear these heteroatom species at the ω-polymer end, prepared by using organostibine- and bismuthine-mediated living radical polymerizations Various polymers that bear polar functional groups and acidic hydrogen-for example, poly(Me methacrylate), poly(Bu acrylate), poly(N-iso-Pr acrylamide), and poly(2-hydroxyethyl methacrylate)-could be used in the exchange reactions, and subsequent trapping with electrophiles afforded the corresponding polymers with controlled mol. weights, mol. weight distributions, and end-group functionalities. Competition experiments showed that organostibines and organobismuthines were among the most reactive heteroatom compounds towards organometallic reagents and that their high reactivity was responsible for the high chemoselectivity in the exchange reaction.

Chemistry – A European Journal published new progress about Carbanions Role: SPN (Synthetic Preparation), PREP (Preparation). 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Related Products of esters-buliding-blocks.

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

Bazyar, Zahra published the artcileOn/Off O2 Switchable Photocatalytic Oxidative and Protodecarboxylation of Carboxylic Acids, Product Details of C9H10O2, the main research area is photocatalytic oxidative protodecarboxylation carboxylic acid.

Photoredox catalysis in recent years has manifested a powerful branch of science in organic synthesis. Although merging photoredox and metal catalysts has been a widely used method, switchable heterogeneous photoredox catalysis has rarely been considered. Herein, we open a new window to use a switchable heterogeneous photoredox catalyst which could be turned on/off by changing a simple stimulus (O2) for two opponent reactions, namely, oxidative and protodecarboxylation. Using this strategy, we demonstrate that Au@ZnO core-shell nanoparticles could be used as a switchable photocatalyst which has good catalytic activity to absorb visible light due to the localized surface plasmon resonance effect of gold, can decarboxylate a wide range of aromatic and aliphatic carboxylic acids, have multiple reusability, and are a reasonable candidate for synthesizing both aldehydes/ketones and alkane/arenes in a large-scale set up. Some biol. active mols. are also shown via examples of the direct oxidative and protodecarboxylation which widely provided pharmaceutical agents.

Journal of Organic Chemistry published new progress about Aldehydes 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, Product Details of C9H10O2.

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

Huang, Zhiliang published the artcileOxidative Cleavage of Alkenes by O2 with a Non-Heme Manganese Catalyst, Formula: C9H16O2, the main research area is alkene oxygen light manganese oxidation catalyst; ketone preparation.

The oxidative cleavage of C=C double bonds with mol. oxygen to produce carbonyl compounds is an important transformation in chem. and pharmaceutical synthesis. In nature, enzymes containing the first-row transition metals, particularly heme and non-heme iron-dependent enzymes, readily activate O2 and oxidatively cleave C=C bonds with exquisite precision under ambient conditions. The reaction remains challenging for synthetic chemists, however. There are only a small number of known synthetic metal catalysts that allow for the oxidative cleavage of alkenes at an atm. pressure of O2, with very few known to catalyze the cleavage of nonactivated alkenes. In this work, we describe a light-driven, Mn-catalyzed protocol for the selective oxidation of alkenes to carbonyls under 1 atm of O2. For the first time, aromatic as well as various nonactivated aliphatic alkenes could be oxidized to afford ketones and aldehydes under clean, mild conditions with a first row, biorelevant metal catalyst. Moreover, the protocol shows a very good functional group tolerance. Mechanistic investigation suggests that Mn-oxo species, including an asym., mixed-valent bis(μ-oxo)-Mn(III,IV) complex, are involved in the oxidation, and the solvent methanol participates in O2 activation that leads to the formation of the oxo species.

Journal of the American Chemical Society published new progress about Aldehydes Role: SPN (Synthetic Preparation), PREP (Preparation). 39495-82-4 belongs to class esters-buliding-blocks, name is Ethyl 5-methylhex-5-enoate, and the molecular formula is C9H16O2, Formula: C9H16O2.

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

Itoh, Akichika published the artcileOxidative photo-decarboxylation in the presence of mesoporous silicas, Application of tert-Butyl acetylcarbamate, the main research area is carbonyl compound preparation; mesoporous silica catalyst oxidative photodecarboxylation carboxylic acid.

FSM-16, a mesoporous silica, was found to catalyze oxidative photo-decarboxylation of α-hydroxy carboxylic acid, phenylacetic acid derivatives, and N-acyl-protected α-amino acids to afford the corresponding carbonyl compounds Furthermore, FSM-16 proved to be re-usable by re-calcination at 450°C after the reaction.

Chemical & Pharmaceutical Bulletin published new progress about Aldehydes 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, Application of tert-Butyl acetylcarbamate.

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

Li, S. published the artcileExploring the regional typicality of Australian Shiraz wines using untargeted metabolomics, Recommanded Product: Benzyl acetate, the main research area is Shiraz wine regionality volatile compound untargeted metabolomics.

Shiraz is the most widely planted winegrape cultivar in Australia. Sensory studies have indicated that different grapegrowing regions in Australia produce distinct styles of Shiraz wines that differ in flavor characteristics. The current project aimed to characterize the underlying volatile composition associated with regional Shiraz wine styles. Wines were selected from six geog. distinct regions and the volatile compounds were analyzed using gas chromatog. time-of-flight mass spectrometry to provide a comprehensive and holistic overview of the wine volatilome. A suite of R language based software enabled feature extraction and importance ranking, following an untargeted metabolomics approach. A classification model based on the random forests algorithm using the 80 most important compounds correctly associated all samples to regions. A range of these compounds, including terpenoids, benzenoids, esters, furan derivatives and aliphatic alcs., has been associated with grape composition, winemaking influences and the ageing process. The results suggest that the regional compositional differences in varietal wines may be influenced by all processes in the entire wine production chain. The current study highlighted the chem. basis underlying the regional typicality of Australian Shiraz wines, and identified specific volatile compounds that may be associated with a region.

Australian Journal of Grape and Wine Research published new progress about Aliphatic alcohols 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

Aragon-Garcia, Fatima published the artcileChanges in the Aromatic Compounds Content in the Muscat Wines as a Result of the Application of Ultrasound during Pre-Fermentative Maceration, Synthetic Route of 106-32-1, the main research area is aromatic compound ultrasound prefermentative maceration wine; aroma; muscat; pre-fermentative maceration; ultrasound; wine.

This research focuses on the aromatic composition of Muscat of Alexandria wines after the application of ultrasound for 40 or 80 min during a 4 h pre-fermentative maceration process. Two methods of ultrasound application were compared in this study: probe ultrasound and bath ultrasound, for periods of 10-20 min per h. Increases of more than 200% were obtained for some of the compounds from the skins, such as two of its terpenes, citronellol and nerol. On the other hand, increases in alc. and ester values were registered with the application of ultrasound for 40 min. However, a significant decrease in these compounds was recorded when the ultrasound process was extended. In fact, when ultrasound was applied for 80 min, content values were even lower than those registered for the wine produced without the application of ultrasound. At the sensory level, the effect resulting from probe and bath ultrasound application for different times were compared, where most of the judges successfully discriminated the wines resulting from the application of ultrasound bath. According to data, the wines resulting from the application of ultrasound bath for 80 min presented the most significant differences, which affected the aromas of white fruit, tropical fruit, stone fruit, flowers and citrus.

Foods published new progress about Aromatic compounds Role: ANT (Analyte), ANST (Analytical Study). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Synthetic Route of 106-32-1.

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

Ma, Xiuyuan published the artcileMnO2 oxidative degradation of lignin and electrochemical recovery study, Computed Properties of 140-11-4, the main research area is lignin manganese dioxide oxidative degradation electrochem recovery.

Effective degradation of lignin and further production of small-mol. aromatic chems. are of great importance in sustainable chem. In this experiment, lignin was efficiently oxidatively degraded under mild conditions using inexpensive manganese dioxide rather than a precious metal catalyst, with a lignin degradation efficiency of 66%. A double electrolytic cell system was then used to achieve the recycling of manganese dioxide at the anode while producing hydrogen at the cathode. GC-MC anal. showed that the lignin was degraded to chems. containing small aromatic mols. such as benzoic acid and benzyl acetate. This experiment provides a new pathway for the cyclic degradation of lignin.

Polymer Degradation and Stability published new progress about Aromatic compounds 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, Computed Properties of 140-11-4.

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

Jain, Isha published the artcileManganese-mediated acetylation of alcohols, phenols, thiols, and amines utilizing acetic anhydride, Computed Properties of 140-11-4, the main research area is acetate preparation green chem solventless; aliphatic alc acetic anhydride acetylation manganese catalyst; phenol acetic anhydride acetylation manganese catalyst; thiophenol acetic anhydride acetylation manganese catalyst; aniline acetic anhydride acetylation manganese catalyst.

Manganese(II) chloride-catalyzed acetylation of alcs., phenols, thiols and amines RXH (R = Ph, n-octyl, cyclohexyl, etc.; X = O, S, NH), morpholine with acetic anhydride is reported. This method is environment-friendly and economically viable as it involves inexpensive, relatively benign catalyst, mild reaction condition, and simple workup. Acetylation is performed under the solvent-free condition at ambient temperature and acetylated products RXAc, N-acetylmorpholine obtained in good to excellent yields. Primary, secondary heterocyclic amines, and phenols with various functional groups are smoothly acetylated in good yields. This method exhibits exquisite chemoselectivity, and the amino group is preferentially acetylated in the presence of a hydroxyl/thiol group.

Synthetic Communications published new progress about Acetates 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, Computed Properties of 140-11-4.

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

James, Reuben R. published the artcileOne-Pot Reductive Acetylation of Aldehydes using 1-Hydrosilatrane in Acetic Acid, Category: esters-buliding-blocks, the main research area is acetate one pot preparation aldehyde reductive acetylation hydrosilatrane mediator.

A one-pot, direct reductive acetylation of aldehydes was achieved under mild conditions using 1-hydrosilatrane as a safe and easily accessible catalyst. Described herein is a facile synthesis that produces acylated primary alcs. that can serve as valuable building blocks for organic synthesis. The method has good functional group tolerance and works for a range of aryl aldehydes, with the notable exception of electron-rich arenes. A library of esters was isolated by flash chromatog. in yields as high as 92%.

SynOpen published new progress about Acetates 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, Category: esters-buliding-blocks.

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

Sole, Roberto published the artcileSynthesis of 2-Alkylaryl and Furanyl Acetates by Palladium Catalysed Carbonylation of Alcohols, COA of Formula: C9H10O2, the main research area is aralkyl alc methanol carbon monoxide palladium catalyst methoxycarbonylation; alkylaryl acetate preparation.

In this paper, the reaction between benzyl alc., chosen as a model substrate, CH3OH and CO was tested in the presence of a homogeneous palladium catalyst, an activator (isopropenyl acetate (IPAc) or di-Me carbonate (DMC)) and a base (Cs2CO3). The influence of various reaction parameters such as the CO pressure, ligand and palladium precursor employed, mmol% catalyst load, temperature and time were investigated. The results demonstrate that decreasing the CO pressure from 50 bar to 5 bar at 130°C for 18 h increases yields in benzyl acetate from 36% to over 98%. Further experiments were performed in the presence of piperonyl and furfuryl alc., interesting substrates employed for the synthesis of various fine chems. Moreover, furfuryl alc. is a lignocellulosic-derived building block employed for the synthesis of functionalized furans such as 2-alkylfurfuryl acetates. Both the alcs. were successfully transformed in the corresponding acetate (yields above 96%) in rather mild reaction conditions (5-0.01 mol% catalyst, 5-2 bar CO pressure, 130°C, 4-18h), demonstrating that the alkoxycarbonylation of alcs. represents a promising sustainable alternative to more impactful industrial practices adopted to date for the synthesis of alkylaryl and furfuryl acetates.

Catalysts published new progress about Acetates 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, COA of Formula: C9H10O2.

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