Month: December 2022

Smart, M. C. published the artcileImproved performance of lithium-ion cells with the use of fluorinated carbonate-based electrolytes, Safety of Ethyl (2,2,2-trifluoroethyl) carbonate, the publication is Journal of Power Sources (2003), 359-367, database is CAplus.

There is increasing interest in developing Li-ion electrolytes that possess enhanced safety characteristics, while still able to provide the desired stability and performance. Toward this end, efforts were focused on the development of Li-ion electrolytes which contain partially and fully fluorinated carbonate solvents. The advantage of using such solvents is that they possess the requisite stability demonstrated by the hydrocarbon-based carbonates, while also possessing more desirable phys. properties imparted by the presence of the F substituents, such as lower m.ps., increased stability toward oxidation, and favorable SEI film forming characteristics on C. The beneficial effect of electrolytes which contain the following fluorinated carbonate-based solvents:Me-2,2,2-trifluoroethyl carbonate (MTFEC),Et-2,2,2-trifluoroethyl carbonate (ETFEC), propyl-2,2,2-trifluoroethyl carbonate (PTFEC),Me-2,2,2,2′,2′,2′-hexafluoro-CHMe₂ carbonate (MHFPC),Et-2,2,2,2′,2′,2′-hexafluoroCHMe₂ carbonate (EHFPC), and di-2,2,2-trifluoroethyl carbonate (DTFEC) was demonstrated. These solvents were incorporated into multi-component ternary and quaternary carbonate-based electrolytes and evaluated in Li-C and C-LiNi_0.8Co_0.2O₂ cells, with Li reference electrodes. In addition to determining the charge/discharge behavior of these cells, Tafel polarization measurements, linear polarization measurements, and electrochem. impedance spectroscopy were used to further characterize the performance of these electrolytes, including the SEI formation characteristics and Li intercalation/de-intercalation kinetics.

Journal of Power Sources published new progress about 156783-96-9. 156783-96-9 belongs to esters-buliding-blocks, auxiliary class Trifluoromethylated Building Blocks, name is Ethyl (2,2,2-trifluoroethyl) carbonate, and the molecular formula is C9H9N3, Safety of Ethyl (2,2,2-trifluoroethyl) carbonate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Toumi, Meriem published the artcileElectrogenerated base-promoted synthesis of dithiocarbamate acid esters and 3-(N-substituted-amino)-2-cyanodithiocrotonates from primary or secondary amines and carbon disulfide, Quality Control of 3052-61-7, the publication is Phosphorus, Sulfur and Silicon and the Related Elements (2007), 182(10), 2477-2490, database is CAplus.

Dithiocarbamates and 3-amino-2-cyanodithiocrotonates were prepared by condensation of secondary and primary amines with carbon disulfide alkylation reagent and acetonitrile, promoted by electrogenerated acetonitrile anion. Condensation of secondary amines R¹R²NH with CS₂ and R³X in MeCN, promoted by acetonitrile anion electrogeneration, gave dithiocarbamates R¹R²NCS₂R³ (1, R¹, R² = Et, ⁱPr; R¹R²N = 1-pyrazolyl, 1-imidazolyl, 9-carbazolyl, 4-morpholinyl) as the main products, together with 3-amino-2-cyanodithiocrotonates R³S₂CC(CN):C(Me)NH₂, resulting from autocondensation of two acetonitrile mols. followed by addition of CS₂ and alkylation. Primary amines R¹NH₂ gave mainly the 3-amino-2-cyanodithiocrotonates R³S₂C(CN):C(Me)NHR¹ as a result of condensation of amide anion R¹NH^– with two acetonitrile mols., ammonia elimination and condensation with CS₂. The mechanisms are discussed.

Phosphorus, Sulfur and Silicon and the Related Elements published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C6H13I, Quality Control of 3052-61-7.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Han, Li-Jun published the artcilePalladium-Catalyzed Methoxycarbonylation of 1,3-Butadiene to Methyl-3-Pentenoate: Introduction of a Continuous Process, Recommanded Product: Dimethyl adipate, the publication is Journal of Catalysis (2021), 283-290, database is CAplus.

The base-assisted Pd(cod)Cl₂/xantphos-catalyzed methoxycarbonylation of 1,3-butadiene (BD) to methyl-3-pentenoate (MP) was explored. Mechanistic studies suggested excessive xantphos (beyond an equimolar amount per Pd) as well as its substitute, pyridines of proper steric and electronic functionality, do participate catalytic cycle and significantly reduce activation energy by accelerating rate-limiting methanolysis step. As thus, all reaction parameters, especially solvents, were optimized based on Pd(cod)Cl₂/Xantphos/4-hexylpyridine catalytic system, enabling construction of a continuous process. Systematic optimization demonstrated that a yield of 82% of MP with a purity of 99.8% could be reached under steady-state operation.

Journal of Catalysis published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Recommanded Product: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xiong, Haigen published the artcileIron-catalyzed carboazidation of alkenes and alkynes, Quality Control of 617-52-7, the publication is Nature Communications (2019), 10(1), 1-7, database is CAplus.

An iron-catalyzed rapid carboazidation of alkenes e.g., 1-tert-butyl-4-ethenylbenzene and alkynes RCCH (R = Ph, 3-chlorophenyl, n-C₆H₁₃, etc.), enabled by the oxidative radical relay precursor t-Bu perbenzoate were described. This strategy enjoys success with a broad scope of alkenes under mild conditions, and it can also work with aryl alkynes which are challenging substrates for carboazidation. A large number of diverse structures, including many kinds of amino acid precursors, fluoroalkylated vinyl azides e.g., 1-(1-azido-3,4,4,4-tetrafluoro-3-trifluoromethyl-butyl)-4-tert-butyl-benzene, other specific organoazides R¹CH₂CH(N₃)CH₂(CF₂)₃CF₃ (R¹ = 5-bromopentyl, 8-(benzyloxy)octyl, 8-hydroxyoctyl, etc.), and 2H-azirines I (R² = n-C₄F₉, C₂F₅, c-C₆F₁₁, etc.) can be easily produced.

Nature Communications published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C3H7NO2, Quality Control of 617-52-7.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Cobo-Golpe, M. published the artcilePortable dehumidifiers condensed water: A novel matrix for the screening of semi-volatile compounds in indoor air, Name: Dimethyl adipate, the publication is Chemosphere (2020), 126346, database is CAplus and MEDLINE.

The comprehensive identification of organic species existing in indoor environments is a key issue to understand their impact in human health. This study proposes the anal. of condensed water samples, collected with portable dehumidifiers, to characterize semi-volatile compounds in the gas phase of confined areas. Water samples are concentrated by solid-phase extraction (SPE). The obtained extracts are analyzed by gas chromatog. (GC) time-of-flight mass spectrometry (TOF-MS), following a non-target screening data mining approach. In first term, spectra of deconvoluted compounds are compared with those in NIST low resolution library; thereafter, tentative identifications are verified using an inhouse database of accurate electron ionization (EI) MS spectra. Chromatog. (retention index) and spectral data are combined for unambiguous species identification. The potential of condensed water samples to reflect changes in the composition of indoor atmospheres, the match between data obtained using different dehumidifiers, and the relative concentration efficiency of condensed water compared to that attained by active sampling of moderate air volumes are discussed. A total of 141 semi-volatile compounds were identified (98 confirmed against authentic standards) in a set of 21 samples obtained from different homes and working places. This list contains more than 40 fragrances (including several potential allergens), solvents and intermediates in the production of polymeric materials, plasticizers and flame retardants.

Chemosphere published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Name: Dimethyl adipate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Azevedo, Juliana V. C. published the artcileProcess-Induced Morphology of Poly(Butylene Adipate Terephthalate)/Poly(Lactic Acid) Blown Extrusion Films Modified with Chain-Extending Cross-Linkers, SDS of cas: 31570-04-4, the publication is Polymers (Basel, Switzerland) (2022), 14(10), 1939, database is CAplus and MEDLINE.

Process-induced changes in the morphol. of biodegradable polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) blends modified with various multifunctional chain-extending cross-linkers (CECLs) are presented. The morphol. of unmodified and modified films produced with blown film extrusion is examined in an extrusion direction (ED) and a transverse direction (TD). While FTIR anal. showed only small peak shifts indicating that the CECLs modify the mol. weight of the PBAT/PLA blend, SEM investigations of the fracture surfaces of blown extrusion films revealed their significant effect on the morphol. formed during the processing. Due to the combined shear and elongation deformation during blown film extrusion, rather spherical PLA islands were partly transformed into long fibrils, which tended to decay to chains of elliptical islands if cooled slowly. The CECL introduction into the blend changed the thickness of the PLA fibrils, modified the interface adhesion, and altered the deformation behavior of the PBAT matrix from brittle to ductile. The results proved that CECLs react selectively with PBAT, PLA, and their interface. Furthermore, the reactions of CECLs with PBAT/PLA induced by the processing depended on the deformation directions (ED and TD), thus resulting in further non-uniformities of blown extrusion films.

Polymers (Basel, Switzerland) published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, SDS of cas: 31570-04-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Tunc, Nihat published the artcileNanoceria-Supported Ru-Based Nanoparticles as Highly Efficient Catalysts for Hydrolysis of Ethane 1,2-Diamine Borane, Formula: C11H15NO2, the publication is ChemistrySelect (2022), 7(13), e202200399, database is CAplus.

Here, the first ever preparation of some series of nanoceria-supported Ru-based nanoparticles with different compositions (Ru_xM_100-x@NC, M: Co, Ni, Pd) and their use as highly active catalysts to liberate hydrogen gas from hydrolysis of ethane 1,2-diamine borane (EDAB) is reported. For the preparation of totally fifteen Ru_xM_100-x@NC nanoparticles with different compositions, the related metal cations are first supported on nanoceria surfaces by wet impregnation method in aqueous solution Then, Ru³⁺-M²⁺-exchanged nanoceria samples are synchronously reduced during hydrolysis reaction of EDAB to form corresponding Ru_xM_100x@NC nanoparticles meanwhile the formed nanoparticles catalyze the same reaction. RuxM100x@NC nanoparticles are identified by inductively coupled plasma-optical emission spectroscopy (ICP-OES), powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), XPS, and BET surface area techniques. They provide quiet high catalytic activities in the hydrolysis reaction of EDAB. Among them, Ru₂₀Pd₈₀@NC nanoparticles are by far the best one up to date with a TOF value of 608.49 min^-1 at 25°C.

ChemistrySelect published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C13H18BClO2, Formula: C11H15NO2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Nguyen Huu, Cuong published the artcileSynergistic inactivation of bacteria based on a combination of low frequency, low-intensity ultrasound and a food grade antioxidant, Application In Synthesis of 121-79-9, the publication is Ultrasonics Sonochemistry (2021), 105567, database is CAplus and MEDLINE.

This study evaluated a synergistic antimicrobial treatment using a combination of low frequency and a low-intensity ultrasound (LFU) and a food-grade antioxidant, Pr gallate (PG), against a model gram-pos. (Listeria innocua) and the gram-neg. bacteria (Escherichia coli O157:H7). Bacterial inactivation kinetic measurements were complemented by characterization of biophys. changes in liposomes, changes in bacterial membrane permeability, morphol. changes in bacterial cells, and intracellular oxidative stress upon treatment with PG, LFU, and a combination of PG + LFU. Combination of PG + LFU significantly (>4 log CFU/mL, P < 0.05) enhanced the inactivation of both L. innocua and E. coli O157:H7 compared to PG or LFU treatment. As expected, L. innocua had a significantly higher resistance to inactivation compared to E. coli using a combination of PG + LFU. Biophys. measurements in liposomes, bacterial permeability measurements, and scanning electron microscope (SEM)-based morphol. measurements show rapid interactions of PG with membranes. Upon extended treatment of cells with PG + LFU, a significant increase in membrane damage was observed compared to PG or LFU alone. A lack of change in the intracellular thiol content following the combined treatment and limited effectiveness of exogenously added antioxidants in attenuating the synergistic antimicrobial action demonstrated that oxidative stress was not a leading mechanism responsible for the synergistic inactivation by PG + LFU. Overall, the study illustrates synergistic inactivation of bacteria using a combination of PG + LFU based on enhanced membrane damage and its potential for applications in the food and environmental systems.

Ultrasonics Sonochemistry published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, Application In Synthesis of 121-79-9.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Claude-Lafontaine, Angelina published the artcileVolatile constituents of the flower concrete of Gardenia taitensis DC, SDS of cas: 5205-11-8, the publication is Journal of Essential Oil Research (1992), 4(4), 335-43, database is CAplus.

After fractionation by normal distillation under reduced pressure followed by silica gel chromatog., the volatile fractions of the hexane concrete of G. taitensis DC were investigated using GC/MS and GC/FTIR, and more than 150 components were identified. The major oxygenated constituents were linalool (4.4%), Me salicylate (2.5%), (Z)-3-hexenyl benzoate (2.2%), dihydroconiferyl alc. (1.1%), (Z)-3-hexenyl salicylate (0.7%), benzyl benzoate (6.2%), dihydroconiferyl acetate (12.2%), 2-phenylethyl benzoate (6.2%), benzyl salicylate (2.5%), geranyl benzoate (2.1%) and 2-phenylethyl salicylate (2.2%). The identification of numerous dihydroconiferyl esters appears to be unique to this species.

Journal of Essential Oil Research published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, SDS of cas: 5205-11-8.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Steenhuisen, S.-L. published the artcileFloral scent in bird- and beetle-pollinated Protea species (Proteaceae): Chemistry, emission rates and function, Computed Properties of 5205-11-8, the publication is Phytochemistry (Elsevier) (2012), 78-87, database is CAplus and MEDLINE.

Evolutionary shifts between pollination systems are often accompanied by modifications of floral traits, including olfactory cues. The authors investigated the implications of a shift from passerine bird to beetle pollination in Protea for floral scent chem., and also explored the functional significance of Protea scent for pollinator attraction. Using headspace sampling and gas chromatog.-mass spectrometry, they found distinct differences in the emission rates and chem. composition of floral scents between eight bird- and four beetle-pollinated species. The amount of scent emitted from inflorescences of beetle-pollinated species was, on average, about 10-fold greater than that of bird-pollinated species. Floral scent of bird-pollinated species consists mainly of small amounts of green-leaf volatiles and benzenoid compounds, including benzaldehyde, anisole and benzyl alc. The floral scent of beetle-pollinated species is dominated by emissions of linalool, a wide variety of other monoterpenes and the benzenoid Me benzoate, which imparts a fruity odor to the human nose. The number of compounds recorded in the scent of beetle-pollinated species was, on average, greater than in bird-pollinated species (45 vs. 29 compounds, resp.). Choice experiments using a Y-maze showed that a primary pollinator of Protea species, the cetoniine beetle Atrichelaphinis tigrina, strongly preferred the scent of inflorescences of the beetle-pollinated Protea simplex over those of the bird-pollinated sympatric congener, Protea roupelliae. This study shows that a shift from passerine bird to insect pollination can be associated with marked up-regulation and compositional changes in floral scent emissions.

Phytochemistry (Elsevier) published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C23H43NP2, Computed Properties of 5205-11-8.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics