Month: December 2022

Abdulagatov, Ilmutdin M. published the artcileSimultaneously measurements of vapor-pressure, saturated liquid density, single-phase PVT properties, and thermal -pressure coefficient of methyl decanoate at high- temperatures and high-pressures, Safety of Methyl decanoate, the main research area is methyl decanoate saturated liquid density single phase PVT property.

The vapor-pressure (PS), saturated liquid d. (ρS), single-phase (PVT) properties, and thermal-pressure coefficient, γV = (∂P/∂T)V, of one of the biofuel components (Me decanoate) have been measured in the present work. The measurements were made over a temperature range from (292 to 464) K and at pressures up to 21 MPa. The measurements were performed using a high-temperature, high-pressure, nearly constant-volume adiabatic piezo-calorimeter along 16 liquid and vapor isochores between (152 and 834) kg·m – 3. Most measurements were focused in the immediate vicinity of the liquid-gas coexistence curve (single- and two-phase regions) to accurately determine the phase transition properties (PS,ρS, TS,γVS). Temperatures at the liquid-gas phase transition curve, TS(ρ), for each measured d. (isochore) were determined using the isochoric P-T break- point and abrupt behavior of the thermal-pressure coefficient techniques, γV – T curve behavior. The expanded uncertainty of the pressure (P), d. (ρ), and thermal -pressure coefficient (γV) measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be (0.05 to 0.50)% (depending on pressure range), 0.16%, and (0.12 to 1.5)% (depending on temperature and pressure), resp. The measured pressures and temperature derivatives,(∂P/∂T)V, have been used to calculate internal pressure (or energy-volume coefficient), enthalpy and entropy of vaporization, and heat capacity changes.

Fluid Phase Equilibria published new progress about Animal fats Role: PEP (Physical, Engineering or Chemical Process), PROC (Process). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Safety of Methyl decanoate.

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

Chaiyabutr, Chayada published the artcileUltraviolet filters in sunscreens and cosmetic products-A market survey, Product Details of C15H20O3, the main research area is UV filter sunscreen cosmetic product market survey Thailand; UV filters; cosmetics; market survey; sunscreens; ultraviolet.

As several reports have raised a variety of environmental, health, and safety issues related to UV filters, it is crucial to understand the trends in the exposure of the population to UV filters. To determine the frequency of UV filter usage in sunscreens and other cosmetic products in Thai market. We surveyed the UV filter labeling on sunscreens and cosmetic products sold in the Thai market. In all, 312 sunscreens and 1350 other cosmetic products were investigated. Titanium dioxide was the most frequently used UV filter in both sunscreens (66.7%) and other cosmetic products (68.4%). Ethylhexyl methoxycinnamate was the most common organic UVB filter, whereas Bu methoxydibenzoylmethane was the most common organic UVA filter. In sunscreens aimed at children, bis-ethylhexyloxyphenol methoxyphenyl triazine was the most commonly used UV filter. The most frequent co-occurrence of UV filters was titanium dioxide and ethylhexyl methoxycinnamate. Titanium dioxide was the most commonly used UV filter, which differs from the findings of previous surveys. Knowing the availability and frequency of each UV filter provides valuable information about consumer exposure levels, facilitates refinements of the allergen series in patch testing, and enhances the monitoring of adverse effects of UV filters.

Contact Dermatitis published new progress about Allergens Role: ADV (Adverse Effect, Including Toxicity), BIOL (Biological Study). 71617-10-2 belongs to class esters-buliding-blocks, name is Isopentyl 3-(4-methoxyphenyl)acrylate, and the molecular formula is C15H20O3, Product Details of C15H20O3.

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

de Castro Sena, Suzara Rayanne published the artcileEffect of Ethyl Octanoate and Ethyl Oleate on the Properties of Gasoline Fuel Mixture, Computed Properties of 106-32-1, the main research area is ethyl octanoate oleate gasoline fuel mixture property.

The objective of this study was to evaluate the application of esters as gasoline additives based on physicochem. characterization analyzes. Reid vapor pressure, d., distillation curves, and rheol. profile of pure gasoline and its mixture with esters (Et octanoate and Et oleate) at different concentrations (0, 2.5, 5, 15%) were analyzed. Heat of combustion, corrosiveness, and octane number (MON-motor octane number, RON-research octane number) of the mixtures were also evaluated. The results showed that the Reid vapor pressure, distillation curve, and corrosiveness of the mixtures were within the values required by the legislation. In relation to the rheol. study, the Oswald de Waele model best fits the exptl. values of the ester + gasoline systems. The d. of the gasoline mixtures with esters increased with increasing ester concentration in the mixture The heat of combustion of the gasoline mixtures decreased with an increase in the ester concentration in gasoline. The octane indexes MON and RON were better when Et octanoate was added to gasoline.

Energy & Fuels published new progress about Alkenes Role: OCU (Occurrence, Unclassified), PRP (Properties), OCCU (Occurrence). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Computed Properties of 106-32-1.

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

Radchenko, Dmytro S. published the artcileCyclobutane-Derived Diamines: Synthesis and Molecular Structure, Related Products of esters-buliding-blocks, the main research area is cyclobutane diamine preparation mol structure.

Cyclobutane diamines (i.e., cis- and trans-1,3-diaminocyclobutane, 6-amino-3-azaspiro[3.3]heptane, and 3,6-diaminospiro[3.3]heptane) are considered as promising sterically constrained diamine building blocks for drug discovery. An approach to the syntheses of their Boc-monoprotected derivatives has been developed aimed at the preparation of multigram amounts of the compounds These novel synthetic schemes exploit classical malonate alkylation chem. for the construction of cyclobutane rings. The conformational preferences of the cyclobutane diamine derivatives have been evaluated by X-ray diffraction and compared with the literature data on sterically constrained diamines, which are among the constituents of com. available drugs.

Journal of Organic Chemistry published new progress about Alicyclic amines Role: SPN (Synthetic Preparation), PREP (Preparation) (diamines). 37942-79-3 belongs to class esters-buliding-blocks, name is Dimethyl spiro[3.3]heptane-2,6-dicarboxylate, and the molecular formula is C11H16O4, Related Products of esters-buliding-blocks.

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

Eronen, Aleksi E. K. published the artcileSynthesis of Diaryl Hydroxyl Dicarboxylic Acids from Amino Acids, Synthetic Route of 140-11-4, the main research area is aryl hydroxyl dicarboxylic acid synthesis amino acid; safety glass failure microwave.

Herein we report a unique method for preparing diaryl hydroxyl dicarboxylic acids in a diastereospecific manner. The three-component reaction occurs between amino acid, aromatic aldehyde, and primary alc. in alk. solutions under microwave-assisted conditions. The dicarboxylic acids are isolated as sodium salts in high yields (up to 77%) by direct precipitation from the reaction solution The exptl. results suggest that the diastereospecificity originates from a [3,3]-sigmatropic rearrangement followed by a sodium-assisted hydride transfer. As further shown, the previously unreported dicarboxylic acids are easily turned into corresponding δ-lactones. Safety: possible glass failure on account of pressure buildup in microwave.

Journal of Organic Chemistry published new progress about Aldol condensation (MPV/aldol condensation sequence for cinnamaldehyde synthesis). 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

Xu, Yufei published the artcileCatalytic Transfer Hydrogenation of Biomass-derived Levulinates to γ- valerolactone Using Alcohols as H-donors, Formula: C7H12O3, the main research area is review biomass levulinate gamma valerolactone alc hydrogen donor.

Gamma-Valerolactone (GVL) is a kind of significant platform mols. in the modern industry, which can be directly produced from biomass-derivatives, such as sugar, levulinic acid (LA) and Et levulinate (EL). In general, GVL could be produced from LA using gas hydrogen as H-donor with heterogeneous or homogeneous catalysts. But this strategy always has the danger of operation and requirement of unique reactors due to explosive hydrogen as well as the acidity of reactant. Over the past decade, researchers in this field have established new processes and strategies to meet the above problems through the CTH process by using alc. as H-donor and EL as the substrate over different kinds of catalysts. In this review, we collect and discuss the literature on the production of GVL from EL, and applications of LA, EL, and GVL with particular typical mechanisms. The catalyst preparation methods in the mentioned reaction systems are also concerned.

Current Green Chemistry published new progress about Alcohols Role: BCP (Biochemical Process), BIOL (Biological Study), PROC (Process). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

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

Dekel, Amir published the artcileThe sulcatone receptor of the strict nectar-feeding mosquito Toxorhynchites amboinensis, Computed Properties of 111-11-5, the main research area is Toxorhynchites sulcatone receptor Or4 gene; Aedes aegypti; Insect repellent; Odorant receptor; Olfaction; Toxorhynchites amboinensis.

Controlling Ae. aegypti populations and the prevention of mosquito bites includes the development of monitoring, repelling and attract-and-kill strategies that are based on understanding the chem. ecol. of these pests. Olfactory-mediated attraction to mammals has recently been linked to the mosquito Aedes aegypti odorant receptor Or4, which is activated by animal-released 6-Methyl-5-hepten-2-one (sulcatone). This odorant is also a major component of flower scents and may play a role outside animal-host seeking. To explore the role of this chem. cue, we looked at the interaction between sulcatone and an Or4 homolog expressed in the antennae of the strict nectar-feeding mosquito Toxorhynchites amboinensis. Using the two-electrode voltage clamp of Xenopus oocytes as a heterologous expression system, we show that this receptor is a high intensity sulcatone receptor comparable to its Aedes counterparts. We also show that OR4 is activated by other aliphatic ketones and is inhibited by DEET. This pharmacol. characterization suggests that sulcatone may be operating in more than one context in the Culicidae family.

Insect Biochemistry and Molecular Biology published new progress about Aedes aegypti Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Computed Properties of 111-11-5.

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

Slaghenaufi, Davide published the artcileTwo sides to one story-aroma chemical and sensory signature of Lugana and Verdicchio wines, Application In Synthesis of 5405-41-4, the main research area is Lugana Verdicchio wine sensory property aroma; Lugana; Verdicchio; chemical signature; sensory space; wine aroma.

Lugana and Verdicchio are two Italian white wines with a Protected Designation of Origin (PDO) label. These two wine types are produced in different regions using the same grape variety. The aim of this work is to investigate the existence of volatile chem. markers that could help to elucidate differences between Lugana and Verdicchio wines both at chem. and sensory levels. Thirteen com. wine samples were analyzed by Gas Chromatog.-Mass Spectrometry (GC-MS), and 76 volatile compounds were identified and quantified. Verdicchio and Lugana had been differentiated on the basis of 19 free and glycosidically bound compounds belonging to the chem. classes of terpenes, benzenoids, higher alcs., C6 alcs. and norisoprenoids. Samples were assessed by means of a sorting task sensory anal., resulting in two clusters formed. These results suggested the existence of 2 product types with specific sensory spaces that can be related, to a good extend, to Verdicchio and Lugana wines. Cluster 1 was composed of six wines, 4 of which were Lugana, while Cluster 2 was formed of 7 wines, 5 of which were Verdicchio. The first cluster was described as “”fruity””, and “”fresh/minty””, while the second as “”fermentative”” and “”spicy””. An attempt was made to relate anal. and sensory data, the results showed that damascenone and the sum of 3 of esters the Et hexanoate, Et octanoate and isoamyl acetate, was characterizing Cluster 1. These results highlighted the primary importance of geog. origin to the volatile composition and perceived aroma of Lugana and Verdicchio wines.

Molecules published new progress about Norisoprenoids Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 5405-41-4 belongs to class esters-buliding-blocks, name is Ethyl 3-hydroxybutanoate, and the molecular formula is C6H12O3, Application In Synthesis of 5405-41-4.

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

Zhang, Yanxin published the artcileChemical variability in volatile composition among five species of genus Solidago (Asteraceae), Formula: C11H22O2, the main research area is Solidago essential oil volatile compound.

Solidago is a genus of more than 120 species of flowering plants in the Asteraceae family and mainly distributed in Americas. To explore the differences of volatile components and analyze their correlations as well variability among the five species (Solidago caesia, Solidago tortifolia, Solidago glomerata, Solidago nemoralis and Solidago rugosa) of this genus, their volatile components were determined by gas chromatog.-mass spectrometry (GC-MS) and then the principal component anal. (PCA) was carried out with PAST (PAST2.08). The results indicated that Solidago caesia almost characterized by the same chemotype with Solidago glomerata due to their common essential oil compositions b-cubebene, (1R)-(+)-α-pinene and (-)-a-cadinol while Solidago nemoralis has little variability with Solidago rugosa and with the presence of germacrene D, limonene and sabenene as the representative compounds But there is chem. variability between Solidago tortifolia and other four species. Sabenene and πcalacorene are the major volatile compounds of Solidago tortifolia.

Biochemical Systematics and Ecology published new progress about Essential oils Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Formula: C11H22O2.

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

Morino, Yusuke published the artcileCu/N-Oxyl-catalyzed aerobic oxidative esterification to oxalic acid diesters from ethylene glycol via highly selective intermolecular alcohol oxidation, Application of Ethyl 2-hydroxyacetate, the main research area is oxalic acid diester preparation green chem; ethylene glycol primary sec alc aerobic oxidative esterification; copper tetramethylethylenediamine dimethyl azanoradamantane oxyl catalyst.

One of the ideal green esterification reactions is aerobic oxidative esterification using only a stoichiometric amount of different alcs. via intermol. selective alc. oxidation followed by hemiacetal formation by the addition of the other alc. and hemiacetal oxidation to esters. However, oxalic acid diester synthesis via oxidative esterification has not been reported to date, possibly owing to the difficulty of selectivity control of intermol. alc. oxidation and the chelating effects of ethylene glycol-derived alcs./hemiacetals on inhibiting oxidation catalysts. Herein, using a CuCl/tetramethylethylenediamine/1,5-dimethyl-9-azanoradamantane N-oxyl catalyst, authors describe a highly efficient aerobic oxidative esterification reaction of ethylene glycol to various oxalic acid diesters via selective oxidation of ethylene glycol-derived alcs./hemiacetals even in the presence of other aliphatic primary alcs. Notably, the green reaction works well using an ideal stoichiometric ratio of ethylene glycol and primary/secondary alcs. Thorough exptl. investigation and theor. calculations revealed that highly selective oxidative esterification is enabled by the preferential bidentate coordination of ethylene glycol-derived alcs./hemiacetals to the Cu(II) species, followed by efficient two-electron/one-proton transfer.

Green Chemistry published new progress about Dicarboxylic acids, diesters Role: SPN (Synthetic Preparation), PREP (Preparation). 623-50-7 belongs to class esters-buliding-blocks, name is Ethyl 2-hydroxyacetate, and the molecular formula is C4H8O3, Application of Ethyl 2-hydroxyacetate.

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