Tag: M.W=150-200

Andrade-Eiroa, Aurea published the artcilePolar Aromatic Compounds in Soot from Premixed Flames of Kerosene, Synthetic Paraffinic Kerosene, and Kerosene-Synthetic Biofuels, Recommanded Product: Methyl octanoate, the main research area is polar aromatic compound soot premixed flame kerosene synthetic biofuel.

Polar aromatic compounds (PACs) adsorbed on soot produced in laboratory premixed flames of fossil kerosene (Jet A-1), synthetic paraffinic kerosene (SPK), and Jet A-1/synthetic biofuels (2,5-dimethylfuran, methyloctanoate, diethylcarbonate, and 1-butanol) were characterized for the first time with the aim of shedding light on the combustion mechanisms and evaluating the environmental impact of these synthetic biofuels. The following families of compounds were fractionated from the soot extracts, and furthermore, their relative abundances were estimated: (a) oxa-AHs (xanthenes, benzoxanthene, alcoxy-AHs, furan derivatives..); (b) aldehydes-AHs, (c) ketones-AHs; (d) quinones-AHs; (e) aromatic monocarboxylic acids; (f) aromatic hydroxy acids; (g) aromatic dicarboxylic acids; (h) nitrated-AHs (including amines, acridines, cinnoline derivatives, carbazoles…); and (i) nitro-AHs. The results obtained point out that overall, soot from Jet A-1/biofuel premixed flames is richer in PACs than soot from pure Jet A-1 and SPK. Out of the fuels studied, Jet A-1/1-butanol produces the highest concentrations of nitro-AHs (namely, nitro-benzaldehydes), aldehydes-AHs, and hydroxy-AHs (including two isomers of hydroxy-benzaldehyde), whereas Jet A-1/diethylcarbonate produces the highest concentrations of quinones-AHs (especially phenanthrene quinones) and large concentrations of nitrated-AHs. On the other hand, soot from Jet A-1/methyloctanoate is the richest one in mono-aromatic and dicarboxylic acids, aromatic hydroxyacids, nitrated-AHs, and esters. Combustion of the Jet A-1/2,5-dimethylfuran mixture emits the highest concentrations of ketones-AHs and oxa-AHs (namely, furan derivatives). We should remark that although the soot samples were obtained from premixed flames, the lab conditions being far from the industrial conditions, particularly in terms of pressure; the chem. going on should not be so different that our findings could not be extrapolated to industrial conditions.

Energy & Fuels published new progress about Amines Role: FMU (Formation, Unclassified), PEP (Physical, Engineering or Chemical Process), POL (Pollutant), FORM (Formation, Nonpreparative), PROC (Process), OCCU (Occurrence). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Recommanded Product: Methyl octanoate.

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

Chinthaparthi, Radha Rani published the artcileSynthesis, characterisation and antimicrobial activity of 3-thio-1,5-dihydro-2,4,3-benzodioxaphosphepin-3-amino acid esters, Related Products of esters-buliding-blocks, the main research area is thioxohydrobenzodioxaphosphepinamino acid ester preparation antibacterial antifungal; thioxohydrobenzodioxaphosphepine amino ester preparation antibacterial antifungal.

A new series of 8-methoxy-3-thioxo-1,5-dihydro-2,4,3-benzodioxaphosphepin-3-amino acid esters was synthesized by treating various amino ester hydrochlorides with a P monochloride intermediate, which was generated in situ from 4-MeOC6H3-1,2-(CH2OH)2 and PSCl2 in the presence of Et3N in anhydrous THF at 0-5° to room temperature The title compounds exhibited significant antibacterial and antifungal activity.

Organic Communications published new progress about Amino acid esters Role: PAC (Pharmacological Activity), RCT (Reactant), SPN (Synthetic Preparation), THU (Therapeutic Use), BIOL (Biological Study), RACT (Reactant or Reagent), PREP (Preparation), USES (Uses). 10047-10-6 belongs to class esters-buliding-blocks, name is Methyl 2-aminopentanoate hydrochloride, and the molecular formula is C6H14ClNO2, Related Products of esters-buliding-blocks.

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

Ponomareva, Ekaterina published the artcileNovel reactivation allows effective reuse of Nafion super-acid nano-catalyst, SDS of cas: 111-11-5, the main research area is octanoic acid methanol Nafion zeolite esterification catalyst.

The reactivation strategy makes use of advanced oxidation processes (Fenton and non-Fenton) to remove the organic deposits generated from sequential catalytic cycles. Hot water treatment was considered as a control case to evaluate the extraction capacity of water itself at the oxidative conditions. Advanced oxidation processes were effective in reactivating the Nafion SAC-13 resin, which also rendered a cleaner and more sustainable reactivation process. Beta zeolite was studied as model fouled system prior to the Nafion SAC-13. Even though zeolites are considered to be thermally stable, this approach can be used when a full preservation of the acid sites is required. As far as resin Nafion SAC-13 is concerned, organic species deposition was found to be responsible of a selective poisoning of the sulfonic groups in Nafion, with a consequent drop in catalytic activity of the octanoic acid esterification with methanol. The Nafion resin was reactivated either with H2O2 or with Fenton chem.; the resin remained stable under these oxidative conditions, which is the benefit of the presented nonthermal methodologies as compared to calcination. The optimal method showed full recovery of the initial activity and 90% of the final conversion. This methodol. seems attractive for a whole-range of organic catalytic reactions, including those related to biomass valorization, that require the use of highly acidic catalysts, such as acidic resins, in liquid phase reactions.

Applied Catalysis, A: General published new progress about Beta zeolites, NH4 Role: CAT (Catalyst Use), PEP (Physical, Engineering or Chemical Process), PRP (Properties), USES (Uses), PROC (Process) (CP 814E). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, SDS of cas: 111-11-5.

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

Feng, Ming-Xin published the artcileEvolution of volatile profile and aroma potential of ‘Gold Finger’ table grapes during berry ripening, Computed Properties of 106-32-1, the main research area is grape berry ripening volatile aromatic compound; aroma potential; aroma profile; ripening; ‘Gold Finger’ grape.

‘Gold Finger’ is a grape cultivar with a finger-like shape and a milk flavor. The process by which its aroma profile evolves during ripening is unclear. Thus, changes in the free and bound volatile compounds present in ‘Gold Finger’ grapes during ripening were investigated using headspace sampling-solid-phase microextraction-gas chromatog.-mass spectroscopy (HS-SPME-GC-MS). A total of 83 volatile aroma components were identified in the grapes, with aldehydes, esters, acids, and alcs. being the main components. The total aroma compound content exhibited significant differences between the bound and free forms. The total content of bound volatile compounds did not change significantly during fruit development, although the free aroma compound content was significantly higher than the bound content. The total content of free aldehydes, free alcs., bound norisoprenoids, and ketones gradually increased for up to 70 days after flowering (DAF), while the total free ester, terpene, and acid content decreased. The characteristic aroma compounds of ‘Gold Finger’ grapes were identified as hexanal, (E)-2-hexenal, and Et hexanoate. These results give a foundation for the further development of ‘Gold Finger’ grapes and provide a theor. basis for the selection and breeding of novel aromatic grape varieties. 2021 Society of Chem. Industry.

Journal of the Science of Food and Agriculture published new progress about Alcohols Role: ANT (Analyte), FFD (Food or Feed Use), PUR (Purification or Recovery), ANST (Analytical Study), BIOL (Biological Study), USES (Uses), PREP (Preparation). 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

Gu, Wen-Ting published the artcileNon-targeted metabolomic analysis of variation of volatile fractions of ginseng from different habitats by HS-SPME-GC-MS coupled with chemometrics, Formula: C10H20O2, the main research area is Panax metabolomic volatile compound chemometrics solid phase microextraction.

Cultivated ginseng (CG), transplanted ginseng (TG) and mountain cultivated ginseng (MCG) classified by the habitat type all belong to Panax ginseng and were reported to have similar types of secondary metabolites. Nonetheless, owing to the distinctly diverse habitats in which these ginseng types grow, their pharmacol. effects differ. In the present study, an emerging anal. approach involving headspace solid-phase microextraction-gas chromatog.-mass spectrometry (HS-SPME-GC-MS) was established to effectively distinguish among CG, TG and MCG. First, the volatile components were analyzed and identified by using the NIST library combined with measured retention indexes (Kovats′, RI), and a total of 78 volatile components were finally characterized, which included terpenes, alcs., esters, aldehydes and alkynols. Furthermore, multivariate statistical approaches, principal component anal. (PCA) and orthogonal partial least-squares discrimination anal. (OPLS-DA) were subsequently utilized to screen for compounds of significance. Under optimized HS-SPME-GC-MS conditions, 12, 16, and 16 differential markers were screened in the CG-TG, CG-MCG and TG-MCG groups, resp. Our study suggested that HS-SPME-GC-MS anal. combined with metabolomic anal. methods and chemometric techniques can be applied as potent tools to identify chem. marker candidates to distinguish CG, TG and MCG.

Analytical Methods published new progress about Aldehydes Role: BSU (Biological Study, Unclassified), PUR (Purification or Recovery), THU (Therapeutic Use), BIOL (Biological Study), PREP (Preparation), USES (Uses). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Formula: C10H20O2.

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

Behera, Rakesh R. published the artcileHydrosilylation of Esters Catalyzed by Bisphosphine Manganese(I) Complex: Selective Transformation of Esters to Alcohols, HPLC of Formula: 627-93-0, the publication is Organic Letters (2020), 22(9), 3642-3648, database is CAplus and MEDLINE.

A tricarbonylruthenium Xantphos complex I was prepared and characterized by X-ray crystallog.; in the presence of I, esters underwent chemoselective hydrosilylation with phenylsilane under neat conditions (followed by workup with base) to yield esters. Aryl, alkyl, and alkenyl mono- and dicarboxylates and lactones underwent chemoselective reduction to alcs. and diols; ketoesters underwent reduction to diols. Poly(1,6-hexanediol adipate) underwent hydrosilylation to 1,6-hexanediol.

Organic Letters 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, HPLC of Formula: 627-93-0.

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

Zeng, Zhongyi published the artcile2,2′-Biaryldicarboxylate Synthesis via Electrocatalytic Dehydrogenative C-H/C-H Coupling of Benzoic Acids, Synthetic Route of 1877-71-0, the publication is ACS Catalysis (2021), 11(11), 6626-6632, database is CAplus.

2,2′-Biaryldicarboxylates are important functionalities in bioactive compounds, functional materials, and chiral catalysts. These compounds have been found to be conveniently accessible from benzoic acids via Rh-catalyzed electrooxidative C-H/C-H couplings, giving valuable dihydrogen as the byproduct. In an undivided cell with Pt electrodes, RhCl₃·3H₂O catalyzes the oxidative carboxylate-directed ortho-homocoupling of various aromatic acids with a current efficiency of 67%. The protocol is operationally simple, tolerates a wide variety of functional groups, and does not require the exclusion of air and moisture. Heterodimerizations via cross-dehydrogenative couplings of naphthyl-1-carboxylic acids with acrylic or benzoic acids were also shown to work.

ACS Catalysis published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C6H9N3, Synthetic Route of 1877-71-0.

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

Liu, Shiyu published the artcileTuning Molecular Composition for Better Cross-section Homogeneity of Thermal Oxidative Stabilized Polyacrylonitrile for Carbon Materials, Recommanded Product: Dimethyl itaconate, the publication is Fibers and Polymers (2022), 23(6), 1515-1524, database is CAplus.

A strategy to improve the cross-section homogeneity of thermal oxidative stabilized polyacrylonitrile for carbon materials was provided in the present work. A kind of comonomer, di-Me itaconate (DMI), which possesses two bulky side groups was introduced into poly(acrylonitrile-co-itaconic acid). The efficiency of DMI in improving the cross-section homogeneity of polyacrylonitrile films during thermal oxidative stabilization (TOS) processes and the properties of resulted PAN-based carbon materials were investigated in detail. It was found that DMI facilitated the formation of longer cyclic structures, higher oxygen content, more homogeneous cross-section fracture morphol. and denser structure during TOS process. DMI was also benefit for easing heat release. The presence of DMI also facilitated a smaller I_D/I_G value of the carbonized PAN film and a bigger in-plane size of graphite crystals L_a.

Fibers and Polymers 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 C7H10O4, Recommanded Product: Dimethyl itaconate.

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

Nolla-Saltiel, Roberto published the artcileHydrophosphination of Activated Alkenes by a Cobalt(I) Pincer Complex, SDS of cas: 627-93-0, the publication is Advanced Synthesis & Catalysis (2020), 362(15), 3148-3157, database is CAplus.

Herein is reported the synthesis of three heteroleptic first-row transition metal(II) complexes containing carbazolido NNN pincer ligands and conversion to the corresponding metal(I)-carbonyl complexes via a reductive carbonylation route. These complexes are precatalysts for the hydrophosphination of activated alkenes, affording a cobalt-catalyzed hydrophosphination process that solely and selectively yields the β addition (anti-Markovnikov) product. The scope of this transformation has been investigated using a variety of activated alkenes. Isolation and characterization of substrate-coordinated intermediates reveal available coordination sites, which provide insight into the proposed catalytic cycle.

Advanced Synthesis & 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, SDS of cas: 627-93-0.

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

Riadi, Yassine published the artcileSynergistic Catalytic Effect of the Combination of Deep Eutectic Solvents and Hierarchical H-TiO₂ Nanoparticles toward the Synthesis of Benzimidazole-Linked Pyrrolidin-2-One Heterocycles: Boosting Reaction Yield, Recommanded Product: Dimethyl itaconate, the publication is Polycyclic Aromatic Compounds, database is CAplus.

Synthesis of bioactive heterocyclic compounds comprising pyrrolidinone linked to a benzimidazole moiety I (X = 2-Me, 3-F-4-Cl, 4-OH, etc.) by an eco-friendly and efficient route was investigated. The targeted scaffolds were synthesized from substituted arylamines XC₆H₄NH₂ and available o-phenylenediamine under ultrasonic irradiation in the presence of a mixture of a deep eutectic solvent (DES) and hierarchical TiO₂ (H-TiO₂) microspheres as a green catalytic system. Two DESs were synthesized by sep. mixing FeCl₂ and CuCl₂ with urea. On the other hand, hierarchical TiO₂ (H-TiO₂) was synthesized by a solvothermal route and characterized by XRD, SEM, Raman spectroscopy, and XPS. The results demonstrate that the best reaction yields are obtained by using H-TiO₂ microspheres in the DES. Besides, the synthesized compounds were screened for their antibacterial activity against different bacteria. Overall, eight derivatives were confirmed to exhibit antibacterial activity.

Polycyclic Aromatic Compounds 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 C7H10O4, Recommanded Product: Dimethyl itaconate.

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