Category: esters-buliding-blocks

Dandajeh, Hamisu Adamu published the artcileInfluence of combustion characteristics and fuel composition on exhaust PAHs in a compression ignition engine, COA of Formula: C11H22O2, the main research area is polycyclic aromatic hydrocarbon combustion compression ignition engine.

This paper reports an exptl. investigation into the effects of fuel composition on the exhaust emission of toxic polycyclic aromatic hydrocarbons (PAHs) from a diesel engine, operated at both constant fuel injection and constant fuel ignition modes. The paper quantifies the US EPA (United State Environmental Protection Agency) 16 priority PAHs produced from combustion of fossil diesel fuel and several model fuel blends of n-heptane, toluene and Me decanoate in a single-cylinder diesel research engine based on a com. light duty automotive engine. It was found that the level of total PAHs emitted by the various fuel blends decreased with increasing fuel ignition delay and premixed burn fraction, however, where the ignition delay of a fuel blend was decreased with use of an ignition improving additive the level of particulate phase PAH also decreased. Increasing the level of toluene present in the fuel blends decreased levels of low toxicity of two to four ring PAH, while displacing n-heptane with Me decanoate increased particulate phase adsorbed PAH. Overall, the composition of the fuels investigated was found to have more influence on the concentration of exhaust PAHs formed than that of combustion characteristics, including ignition delay, peak heat release rate and the extent of the premixed burn fractions.

Energies (Basel, Switzerland) published new progress about Automotive engines. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, COA of Formula: C11H22O2.

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

Rodriguez-Donis, Ivonne published the artcileModelling and experimental validation of dimethyl carbonate solvent recovery from an aroma mixture by batch distillation, SDS of cas: 140-11-4, the main research area is aroma mixture dimethyl carbonate solvent recovery batch distillation.

Modeling and exptl. validation of solvent recovery from an aroma mixture by batch distillation process is presented, with particular emphasis of the effect of the prediction of the physicochem. properties and the phase equilibrium data on the content of the aroma compounds in the distillate cuts. The illustrative case study refers to an industrial batch distillation to recover di-Me carbonate (DMC) from an extract generated by a solvent extraction process involving variable natural raw materials for tailored perfume and fragrance applications. Due to the high number of aroma compounds in natural extracts, a synthetic mixture containing six target aroma compounds (α-pinene, eucalyptol, linalool, cis-3-hexenol, fenchone and benzyl acetate) was mixed with DMC for the modeling and exptl. studies of the batch distillation process. The methodol. is tested through the simulation of the process with BatchColumn software. As physicochem. properties of the aroma compounds and the vapor-liquid equilibrium (VLE) of all involved mixtures are required for simulation study, group contribution methods are used to predict missing properties such as vapor pressure, vaporisation enthalpy and liquid and vapor heat capacities. Simulation results are in good agreement with experiments carried out in a fully automated batch distillation column at 15 kPa and help optimize the industrial process operation. The proposed methodol. can be applied for the design of other solvent recovery process in fragrance industry.

Chemical Engineering Research and Design published new progress about Batch distillation. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, SDS of cas: 140-11-4.

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

Tharmasothirajan, Apilaasha published the artcileMicrobial Polyphenol Production in a Biphasic Process, HPLC of Formula: 110-42-9, the main research area is microbial polyphenol biphasic fermentation.

Microbial synthesis of aromatic compounds is generally limited by inherent product toxicity toward the producing cells. Here, in situ extractive strategies represent an efficient approach to avoid such toxic effects and to increase the overall process performance. We conducted a solvent screening to identify suitable organic solvents to develop a biphasic extractive strategy for microbial plant polyphenol production using Corynebacterium glutamicum. From 10 pre-selected organic solvents, tributyrin (TB) showed the best biocompatibility and was chosen for the biphasic extraction process due to its beneficial effect on partitioning and solubility of the plant polyphenol resveratrol. In bioreactors, biphasic cultivation with TB allowed for a product titer of 7.5 mM (1.71 g L-1) resveratrol with a volumetric productivity of 0.26 mM h-1 and a product yield of 0.92 mol mol-1. This biphasic cultivation procedure can be directly employed for the synthesis of other aromatics with similar properties using C. glutamicum.

ACS Sustainable Chemistry & Engineering published new progress about Batch fermentation. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, HPLC of Formula: 110-42-9.

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

Dietz, Christina published the artcileExploring the multisensory perception of terpene alcohol and sesquiterpene rich hop extracts in lager style beer, Application of Methyl octanoate, the main research area is Humulus lager style beer sensory perception terpene alc sesquiterpene; Bitterness; Hop oil fractions; Sensory descriptive analysis; Sensory interactions; Sweetness.

Understanding the contribution of hop essential oil to the multisensory profile of beer is known to be challenging because of its chem. and sensory complexity. Limited research has been conducted investigating hop-derived volatiles’ role in the modulation of taste and mouthfeel sensations. Supercritical CO2 can be used to extract specific fractions from hop oil, thereby enabling the localisation of compounds responsible for different sensory impressions. Terpene alc. and sesquiterpene fractions were extracted from a Magnum hop oil and further fractionated into seven sub-fractions and individual compounds All extracts were evaluated in lager (4.5% volume/volume) by a trained panel (n = 10) using a newly developed attribute lexicon and following a sensory descriptive anal. approach. The sensory data was analyzed using ANOVA, followed by Tukey’s test (HSD) and correlated with chem. profile data obtained by gas chromatog.-mass spectrometry (GC-MS) by Principal Component Anal. The study revealed evidence for hop extracts to impart multisensory characteristics to beer due to sensory interactions within and across modalities. The monoterpene alcs.-rich fractions and particularly geraniol, added fruity- and floral aromas and flavours, modified the sweetness and induced a smooth bitterness in the beer matrix. Flavouring the beer with sesquiterpene fractions resulted in a harsh bitterness sensation. Contrary to previous findings, the humulene epoxides fraction appeared to have limited effects on lingering bitterness and astringency, illustrating the need for temporal sensory assessments in future studies. This research shows that splitting hop oil into fractions and sub-fractions provides a source of natural, sustainable flavouring preparations with distinct sensory characteristics.

Food Research International published new progress about Beer (lager style). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Application of Methyl octanoate.

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

Tiong, Yong Wei published the artcileOptimisation studies on the conversion of oil palm biomass to levulinic acid and ethyl levulinate via indium trichloride-ionic liquids: A response surface methodology approach, SDS of cas: 539-88-8, the main research area is oil palm biomass LA EL indium trichloride ionic liquid.

This work is a continuation and extension of previously published study on the conversions of oil palm empty fruit bunch and mesocarp fiber biomass to levulinic acid and Et levulinate via an eco-friendly indium trichloride-1-methylimidazolium hydrogen sulfate (Tiong et al., 2017). Herein, a response surface methodol. based on a central composite design method was used to optimize the operating conditions of the conversions. The conversions consisted of a two-sequential steps, i.e., depolymerization to levulinic acid, followed by esterification to Et levulinate. The optimum depolymerization occurred at 177°C in 4.8 h with 0.15 mmol indium trichloride in ionic liquids-to-biomass ratio of 6.6:1 (weight/weight) and 22.7% (weight/weight) of water, while esterification was at 105°C in 12.2 h with ethanol to substrate ratio of 7.2:1 (volume/volume). The maximum levulinic acid yields of 17.7% and 18.4%, and the subsequent Et levulinate yields of 18.7% and 20.1% were achieved from the conversions of oil palm empty fruit bunch and mesocarp fiber biomass, resp. LA and EL efficiencies were >63% for both biomass conversions. The ionic liquids could be recycled up to three consecutive runs with a minimal loss of <25% of Et levulinate yield. This study highlighted the potential of proposed ionic liquids for biorefinery processing of renewable feedstock in a greener and sustainable approach. Industrial Crops and Products published new progress about Biomass (Oil palm). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

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

Jiang, Wei published the artcileGene mining, codon optimization and analysis of binding mechanism of an aldo-keto reductase with high activity, better substrate specificity and excellent solvent tolerance, SDS of cas: 539-88-8, the main research area is Candida aldo keto reductase gene mining codon substrate specificity.

The biosynthesis of chiral alcs. has important value and high attention. Aldo-keto reductases (AKRs) mediated reduction of prochiral carbonyl compounds is an interesting way of synthesizing single enantiomers of chiral alcs. due to the high enantio-, chemo- and regioselectivity of the enzymes. However, relatively little research has been done on characterization and apply of AKRs to asym. synthesis of chiral alcs. In this study, the AKR from Candida tropicalis MYA-3404 (C. tropicalis MYA-3404), was mined and characterized. The AKR shown wider optimum temperature and pH. The AKR exhibited varying degrees of catalytic activity for different substrates, suggesting that the AKR can catalyze a variety of substrates. It is worth mentioning that the AKR could catalytic reduction of keto compounds with benzene rings, such as cetophenone and phenoxyacetone. The AKR exhibited activity on N,N-dimethyl-3-keto-3-(2-thienyl)-1-propanamine (DKTP), a key intermediate for biosynthesis of the antidepressant drug duloxetine. Besides, the AKR still has high activity whether in a reaction system containing 10%-30% V/V organic solvent. What’s more, the AKR showed the strongest stability in six common organic solvents, DMSO, acetonitrile, Et acetate, isopropanol, ethanol, and methanol. And, it retains more that 70% enzyme activity after 6 h, suggesting that the AKR has strong solvent tolerance. Furthermore, the protein sequences of the AKR and its homol. were compared, and a 3D model of the AKR docking with coenzyme NADPH were constructed. And the important catalytic and binding sites were identified to explore the binding mechanism of the enzyme and its coenzyme. These properties, predominant organic solvents resistance and extensive substrate spectrum, of the AKR making it has potential applications in the pharmaceutical field.

PLoS One published new progress about Candida tropicalis. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

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

Garmendia, Sofiem published the artcileSelf-catalyzed folding of single chain nanoparticles (SCNPs) by NHC-mediated intramolecular benzoin condensation, Application of Benzyl acetate, the main research area is styrene vinylbenzaldehyde vinylbenzylethylbenzimidazolium chloride based catalyst benzyl acetate preparation.

A self-catalyzed folding strategy to form single chain nanoparticles (SCNPs) was developed via an intramol. N-heterocyclic carbene (NHC)-mediated benzoin condensation. Benzaldehyde, styrene and benzimidazolium chloride units were randomly incorporated into a poly(ionic liquid)-based (PIL) copolymer precursor by reversible addition-fragmentation chain transfer (RAFT) copolymerization Post-chem. modification of this linear precursor by insertion of a non-innocent acetate counter-anion into the benzimidazolium moieties conferred thermolatent catalytic behavior owing to the equilibrium between benzimidazolium acetate units and corresponding NHC ones. Upon heating, catalytically active NHCs allowed the formation of benzoin-type intramol. cross-links, thus folding linear chains into SCNPs. NHC moieties became deactivated after cooling to room temperature, which enabled easy isolation and purification of the covalently and intramolecularly cross-linked SCNPs. Importantly, the latent NHC moieties were proven to retain their catalytic activity when arranged into SCNPs as evidenced through their reactivation by simple heating. The catalytic activity of these SCNPs was further confirmed by implementing another NHC-organocatalyzed reaction, namely, transesterification reaction between vinyl acetate and benzyl alc. This work represents the first example of catalysis by a parent linear precursor which drives its own folding and remains catalytically active.

Polymer Chemistry published new progress about Hydrodynamic radius. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application of Benzyl acetate.

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

Fernandez-Mateos, A. published the artcileRadical Cyclization of Epoxy Vinyl- and Allylsulfones Promoted by Titanocene Chloride, Name: Ethyl 5-methylhex-5-enoate, the main research area is radical cyclization epoxy vinyl allylsulfone titanocene.

A titanocene-mediated intramol. radical addition of different epoxy vinyl- and allylsulfones has been achieved. Five- and six-membered ring products were obtained in good to excellent yields in the presence of both 2.2 and 0.2 equiv of Cp2TiCl. A novel double-activation strategy allowed us to achieve small-size rings such as cyclobutanes and cyclopropanes.

Journal of Organic Chemistry published new progress about Radical cyclization. 39495-82-4 belongs to class esters-buliding-blocks, name is Ethyl 5-methylhex-5-enoate, and the molecular formula is C9H16O2, Name: Ethyl 5-methylhex-5-enoate.

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

Piras, Carmen C. published the artcileFacile Method to Obtain Low DS β-ketoesters and Esters of Microfibrillated Cellulose, Category: esters-buliding-blocks, the main research area is microfibrillated cellulose acetoacetate beta ketoester.

Herein we report a facile approach to prepare low DS microfibrillated cellulose acetoacetates and esters. All the reactions were performed directly in cellulose slurries without the need of solvent evaporation, which can cause hornification, and without damaging the fibers. The products obtained display the inserted functionalities while retaining the main features and morphol. of the unmodified cellulose fibers. In comparison to previously reported synthetic routes, this method is cost-effective, more environmentally friendly through omission of extra solvents and the possibility of reusing the dispersing agents, which can be recovered by distillation

Fibers and Polymers published new progress about Transesterification. 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Category: esters-buliding-blocks.

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

Tabanelli, Tommaso published the artcileTransfer Hydrogenation of Methyl and Ethyl Levulinate Promoted by a ZrO2 Catalyst: Comparison of Batch vs. Continuous Gas-Flow Conditions, SDS of cas: 539-88-8, the main research area is transfer hydrogenation methyl ethyl levulinate Zirconia catalyst.

The catalytic conversion of Me and Et levulinates into γ-valerolactone (GVL) by using methanol, ethanol, and 2-propanol as the H-donor/solvent, promoted by the ZrO2 catalyst, is described as carried out under both batch and gas-flow conditions. Under batch conditions, 2-propanol was found to be the best H-donor mol., with Et levulinate giving the highest yield in GVL. The reactions occurring under continuous gas-flow conditions were found to be much more efficient, also showing excellent yields in GVL when EtOH was used as the reducing agent. These experiments clearly show that the ability to release hydrogen from the alc. H-donor/solvent is the main factor driving CTH processes, while the tendency to attack the esteric group is the key step in the formation of transesterification products.

ACS Sustainable Chemistry & Engineering published new progress about Transesterification. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

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