Category: esters-buliding-blocks

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

Lapuerta, Magin published the artcileImprovement of cold flow properties of a new biofuel derived from glycerol, Synthetic Route of 929-77-1, the main research area is biofuel cold flow improver fatty acid glycerol formal ester.

One of the barriers for the extended use of fatty acid Me esters (FAME) as a diesel fuel component is the yield of raw glycerol as a byproduct of the transesterification process. In fact, glycerol is considered as one of the most abundant waste feedstock in the world. A new fuel denoted as FAGE (Fatty Acid Glycerol formal Esters) produced from glycerol and waste oil has been developed. FAME is concomitantly obtained during the manufacturing process of FAGE in different proportions depending of the reaction conditions. Since FAGE cold flow properties are in disadvantage when compared to FAME, the influence of some cold-flow improvers in FAGE/FAME blends has been investigated. In this work, the use of some acetals, co-products of the FAGE production process, are proposed as cold-flow improvers, giving extra value to this new fuel since all the co-products obtained from the production process would have a new industrial use. These two acetals are GF (Glycerol Formal) and GFOMOM (Methoxy-Me glycerol formal). The results obtained show that cold flow properties become poorer when the amount of FAGE increases in the FAGE/FAME blend, but such effect is very slight up to 50% FAGE. The use of the acetals improves cold flow properties of the blends up to 2 °C, with minor effect of the GF content in the GF/GFOMOM acetal blend. In addition, a com. cold flow improver was tested, improving the pour point and the cold filter plugging point with only small effect on cloud point and crystallization temperature The results obtained from the acetals and the cold flow improver are compared, and the value of the acetals as cold flow improvers has been proved. A combination of both, acetals and cold-flow improver, is proposed as an optimal method to improve cold flow properties.

Fuel published new progress about Acidity. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Synthetic Route of 929-77-1.

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, SDS of cas: 41114-00-5, 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). 41114-00-5 belongs to class esters-buliding-blocks, name is Ethyl pentadecanoate, and the molecular formula is C17H34O2, SDS of cas: 41114-00-5.

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

Imyen, Thidarat published the artcileInvestigation of ZSM-12 nanocrystals evolution derived from aluminosilicate nanobeads for sustainable production of ethyl levulinate from levulinic acid esterification with ethanol, Quality Control of 539-88-8, the main research area is aluminosilicate nanobead zeolite nanocrystal ethanol levulinic acid esterification.

The evolution of hierarchical ZSM-12 nanosized crystals as a function of crystallization time has been demonstrated using amorphous aluminosilicate (AS) nanobeads as simultaneous silica and alumina sources and cyclic diquaternary ammonium as a structure-directing agent (SDA) in a one-pot hydrothermal synthesis. The physicochem. properties of the derived ZSM-12 products were characterized by means of x-ray diffraction (x-ray diffraction), x-ray fluorescence spectroscopy (XRF), Fourier transform IR (FTIR) spectroscopy, SEM, TEM, energy dispersive x-ray spectroscopy (EDS) elemental anal., N2 physisorption, temperature-programmed desorption of ammonia (NH3-TPD), and pyridine adsorption. It is clearly demonstrated that crystallinity, textural properties, and acidity of the zeolite products are enhanced as a function of crystallization time. The structure of nanocrystalline ZSM-12 is well-developed after 120 h of crystallization and the corresponding zeolite product exhibits the promising catalytic performance for sustainable production of Et levulinate (EL) from levulinic acid (LA) esterification with ethanol. This contribution illustrates an alternative way to synthesize hierarchical zeolite nanocrystals with MTW framework via the use of homogeneously dispersed aluminosilicate nanobeads as the starting materials and opens up the perspectives for the sustainable application of zeolites nanosized crystals in a bulky-mol. reaction of bio-based chem. synthesis.

Microporous and Mesoporous Materials published new progress about Bronsted acidity. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Quality Control of 539-88-8.

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