Tag: M.W=250-300

Bogdanovskaya, Vera; Korchagin, Oleg published the artcile< Testing a Lithium-Oxygen (Air) Battery: Catalytic Properties of Positive Electrode Materials>, Formula: C19H34O2, the main research area is lithium oxygen air battery pos electrode catalytic property.

Although research in the field of lithium-oxygen (air) batteries (LOB) is rapidly developing, few comprehensive studies on the dependence of the catalytic properties of pos. electrode materials on LOB test conditions are present. In this paper, the influence of the c.d., the type of oxidizer (pure oxygen or air), and a solvent in the electrolyte (DMSO or tetraglyme) on the electrocatalytic properties of PtM/CNT systems (M = Ru, Co, Cr) used as a pos. electrode is investigated. It is shown that at a c.d. of 500 mA/g, more pronounced catalytic effects are observed during the LOB operation than that at 200 mA/g. The obtained results may be explained by the reduced adverse impact of surface passivation with lithium peroxide in the presence of catalysts compared to a similar effect when using unmodified carbon nanotubes (CNT). It is established that the influence of the c.d. on the catalytic properties continues upon the transition from oxygen to air as an oxidizer. When studying the effect of electrolytes on the catalytic properties of materials subjected to long-term LOB cycling, it is shown that the catalytic effects are most prominent when charged in a tetraglyme medium. Although using a catalyst has practically no effect on the number of cycles for both electrolytes, LOB having tetraglyme exceeds the cyclability of LOB having DMSO.

Batteries (Basel, Switzerland) published new progress about Battery anodes. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

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

Ohiaeri, Ejike E.; Odera, Stone R.; Onukwuli, Okechukwu D. published the artcile< The synthesis and optimization of a trimethylolpropane based biolubricant from alard oil base stock>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is optimization trimethylolpropane biolubricant lard oil base stock.

A lard oil based biolubricant was synthesized through a two stage transesterification reaction. Raw lard oil was synthesized with methanol using potassium hydroxide as catalyst to produce a Me ester for the first stage transesterification while the second stage involved the synthesis of the Me ester and trimethylolpropane with sodium methoxide as catalyst to produce the lard oil based TMP ester. The optimization of the lard oil based TMP ester was carried out using a central composite design (CCD) of response surface methodol. The optimal conditions for the various independent variables were reaction temperature of 130 鎺矯, mole ratio of 1:4, catalyst weight of 1.5%weight/weight and reaction time of 180mins for a corresponding lard oil based TMP ester yield of 93%. Anal. of variance (ANOVA) of the response showed a quadratic regression model with interacting independent variables. Regression coefficient (R2) of 0.972 and a standard deviation of 0.631 implies that 97.2% of the changes in the response can be explained by the regression model. The lubricating properties of the lard oil biolubricant are as follows: pour point of -10鎺矯, flash point of 229鎺矯, viscosity index of 2.32, sp. gr. of 0.92g/mL and kinematic viscosity of 40.51 and 10.22cSt at 40 鎺矯 and 100 鎺矯 resp. This study showed that the properties of the lard oil based TMP ester meets the ISO VG32 grade requirement and has its potential as a base oil for gear oil in automobiles.

Pharmaceutical and Chemical Journal published new progress about Composites (central design). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Brito, Gilmar A.; Jung, Woo-Ok; Yoo, Minjin; Krische, Michael J. published the artcile< Enantioselective Iridium-Catalyzed Allylation of Acetylenic Ketones via 2-Propanol-Mediated Reductive Coupling of Allyl Acetate: C14-C23 of Pladienolide D>, SDS of cas: 112-63-0, the main research area is acetylenic ketone allylation enantioselective iridium catalyzed; pladienolide D fragment preparation enantioselective allylation; enantioselectivity; iridium; ketone allylation; transfer hydrogenation; é”?allyl.

Highly enantioselective catalytic reductive coupling of allyl acetate with acetylenic ketones occurs in a chemoselective manner in the presence of aliphatic or aromatic ketones. This method was used to construct C14-C23 fragment (I) of pladienolide D in half the steps previously required.

Angewandte Chemie, International Edition published new progress about Alkynyl ketones Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

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

Dash, Ashutosh K.; Madhubabu, Tatina; Yousuf, Syed Khalid; Raina, Sushil; Mukherjee, Debaraj published the artcile< One-pot Mukaiyama type carbon-Ferrier rearrangement of glycals: Application in the synthesis of chromanone 3-C-glycosides>, Recommanded Product: (2R,3R,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate, the main research area is Ferrier rearrangement glycal glycoside preparation Lewis catalyst stereoselective glycosylation; 2,3-Unsaturated glycosides; Acetophenones; Carbon-Ferrier rearrangement; Chromanone 3-C-glycosides; Glycopyranosides; Lewis acid.

One-pot carbon-Ferrier rearrangement of glycals with un-activated aryl Me ketones has been developed under mild Silyl triflate catalysis. Keto Me group of various aryl Me ketones without being converted into silyl enol ether could directly attack anomeric position of glycals to form keto functionalized C-glycosides in moderate to good yields with high æµ?selectivity. The versatility of this method has been extended to the synthesis of a small library of chromanone 3-C-glycosides.

Carbohydrate Research published new progress about C-Glycosides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 4098-06-0 belongs to class esters-buliding-blocks, and the molecular formula is C12H16O7, Recommanded Product: (2R,3R,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate.

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

Ghallab, Dina S.; Shawky, Eman; Ibrahim, Reham S.; Mohyeldin, Mohamed M. published the artcile< Comprehensive metabolomics unveil the discriminatory metabolites of some Mediterranean Sea marine algae in relation to their cytotoxic activities>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is Ulva Pterocladia Sargassum Spirulina metabolomics metabolites anticancer.

Marine algae have served as a treasure trove of structurally variable and biol. active metabolites. The present study emphasizes on UPLC-MS metabolites fingerprinting for the first systematic broad scale metabolites characterization of three different phyla of marine seaweeds; Ulva fasciata, Pterocladia capillacea and Sargassum hornschuchii along with Spirulina platensis harvested from the Mediterranean Sea. A total of 85 metabolites belonging to various classes including mostly fatty acids and their derivatives, terpenoids, amino acids and dipeptides with considerable amounts of polyphenolic compounds OPLS-DA model offered a better overview of phylum-based discrimination rapidly uncovering the compositional heterogeneity in metabolite profiles of algae extracts An OPLS model was constructed using the cytotoxic activities against PC3 and MDA-MB-231 tumor cells to succinctly screen cytotoxic discriminatory metabolites among the tested algae species. The coefficient plot revealed that unsaturated fatty acids as stearidonic acid and linolenic acid, terpenoids namely as rosmanol, campestanol, dipeptides primarily glutamylglycine, glycyltyrosine along with polyphenolic compounds being abundantly present in S. platensis and U. fasciata samples with relatively marked cytotoxic potential might be the significant contributors synergistically meditating their anti-proliferative activity against PC3 and MDA-MB-231 tumor cells. Such results serve as baseline for understanding the chem. of these species and performing strict correlation between metabolite and activity where a lack of information in this regard is observed

Scientific Reports published new progress about Amino acids Role: BSU (Biological Study, Unclassified), PAC (Pharmacological Activity), PUR (Purification or Recovery), THU (Therapeutic Use), BIOL (Biological Study), PREP (Preparation), USES (Uses). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Tee, Oswald S.; Paventi, Martino published the artcile< Kinetics and mechanism of the bromination of 4-pyridone and related derivatives in aqueous solution>, HPLC of Formula: 112-63-0, the main research area is bromination kinetics mechanism pyridone; tautomerism substituent effect pyridone.

The kinetics of bromination of aqueous 4-pyridone (I) and selected derivatives are determined at 25éŽ?at pH 0.9. The tautomeric system 4-pyridone é–?4-hydroxypyridine reacts with Br2 via the predominant (pyridone) tautomer at pH <6 and via the conjugate anion at pH >6. 3-Bromo-4-pyridone behaves similarly. The kinetics also reveal that the facile dibromination of I occurs because at most pH’s the monobromo derivative is actually more reactive towards Br2 by virtue of its lower pKa. From the point of view of reactivity the 4-pyridones and their anions behave as substituted phenoxide ions. 4-Methoxypyridine does not undergo bromination under comparable conditions, but rather forms a complex with Br2. Tautomerism in phenol brominations are discussed.

Canadian Journal of Chemistry published new progress about Bromination. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

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

Jumaah, Majd Ahmed; Salih, Nadia; Salimon, Jumat published the artcile< Optimization for esterification of saturated palm fatty acid distillate by D-optimal design response surface methodology for biolubricant production>, Reference of 112-63-0, the main research area is palm fatty acid distillate optimal design response surface methodol.

This work presents a synthesis of palm fatty acid distillate (PFAD)-based esters to produce biolubricant oils through the esterification reaction between saturated palm fatty acid distillate (SFA-PFAD) with different types of high degree polyhydric alcs. such as trimethylolpropane (TMP), di-trimethylolpropane (Di-TMP), pentaerythritol (PE), and di-pentaerythritol (Di-PE) in the presence of sulfuric acid as catalyst. The chem. structures of synthesized SFA PFAD-based esters were characterized and confirmed by using FTIR, NMR (1H and 13C) spectroscopies and GC-FID chromatog. The FTIR spectra of SFA PFAD-based ester products clearly showed the peaks of C=O and C-O of ester group at 1732-1740 cm-1 and at 1239-1162 cm-1, resp. Furthermore, 1H NMR spectra confirmed the proton chem. shift (-CH2-O-) of the ester group at 3.80-4.01 ppm. The 13C NMR spectra confirmed the carbon chem. shifts of ester carbonyl signals at 171.09-174.07 ppm and secondary carbons (CH2-C = O) at 40.57-42.44 ppm. The results showed that the optimum conditions for the esterification of SFA-TMP was obtained at acid catalysts of 5%, esterification time and temperature of 6 h and 150 鎺矯, resp. The results have shown the ester products yields have been significantly increased up to 93% with selectivity of 99% SFA-TMP tri-ester after the optimization process by using D-optimal design. The results for lubrication properties have shown that the SFA PFAD-based esters have low-temperature properties with pour points value in the range of 18-35 鎺矯, flash point (270-310 鎺矯), onset oxidative stability temperature (251-322 鎺矯) and viscosity indexes (115-131), resp. The results showed that the presence of many esters functional groups in the mol. structure of SFA PFAD-based esters provides a pos. impact on the lubrication properties. Overall, the results indicated that the SFA PFAD-based esters can be used as biolubricant base oils with pour point depressants.

Turkish Journal of Chemistry published new progress about Correlation analysis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.

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

Zeng, Zhaomu; Chen, Yueyue; Geng, Xiuchao; Zhang, Yuhao; Wen, Xichao; Yan, Qingyu; Wang, Tingting; Ling, Chen; Xu, Yan; Duan, Junchao; Zheng, Kebin; Sun, Zhiwei published the artcile< NcRNAs: multi-angle participation in the regulation of glioma chemotherapy resistance (review)>, Category: esters-buliding-blocks, the main research area is review glioma NcRNA temozolomide cisplatin bevacizumab chemotherapy; chemoresistance; circRNAs; gliomas; lncRNAs; miRNAs; nanomedicine.

A review. As the most common primary tumor of the central nervous system, gliomas have a high recurrence rate after surgical resection and are resistant to chemotherapy, particularly high-grade gliomas dominated by glioblastoma multiforme (GBM). The prognosis of GBM remains poor despite improvements in treatment modalities, posing a serious threat to human health. At present, although drugs such as temozolomide, cisplatin and bevacizumab, are effective in improving the overall survival of patients with GBM, most patients eventually develop drug resistance, leading to poor clin. prognosis. The development of multidrug resistance has therefore become a major obstacle to improving the effectiveness of chemotherapy for GBM. The ability to fully understand the underlying mechanisms of chemotherapy resistance and to develop novel therapeutic targets to overcome resistance is critical to improving the prognosis of patients with GBM. Of note, growing evidence indicates that a large number of abnormally expressed noncoding RNAs (ncRNAs) have a central role in glioma chemoresistance and may target various mechanisms to modulate chemosensitivity. In the present review, the roles and mol. mechanisms of ncRNAs in glioma drug resistance were systematically summarized, the potential of ncRNAs as drug resistance markers and novel therapeutic targets of glioma were discussed and prospects for glioma treatment were outlined. ncRNAs are a research direction for tumor drug resistance mechanisms and targeted therapies, which not only provides novel perspectives for reversing glioma drug resistance but may also promote the development of precision medicine for clin. diagnosis and treatment.

International Journal of Oncology published new progress about Chemosensitivity. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

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

Shu, Xiaomin; Zhong, De; Lin, Yanmei; Qin, Xiao; Huo, Haohua published the artcile< Modular Access to Chiral æµ?(Hetero)aryl Amines via Ni/Photoredox-Catalyzed Enantioselective Cross-Coupling>, Product Details of C19H34O2, the main research area is heterocyclic amine preparation enantioselective; alkyl benzamide aryl chloride cross coupling nickel photoredox catalyst.

A general and modular approach for the direct enantioselective æµ?arylation of saturated azacycles and acyclic N-alkyl benzamides such as N-benzylpyrrolidine, N-benzylazepane, N-benzoylpiperidine, etc. via nickel/photoredox dual catalysis was reported. This process exploits the hydrogen atom transfer ability of photoeliminated chlorine radicals to convert azacycles to the corresponding æµ?amino alkyl radicals, which were further coupled with ubiquitous and inexpensive (hetero)aryl chlorides such as 4-cyanobenzene, benzothiophene, 2-methoxypyrimidine, etc. These coupling reactions require no oxidants or organometallic reagents, feature feedstock starting materials, a broad substrate scope, and high enantioselectivities, and are applicable to late-stage diversification of medicinally relevant complex mols. Mechanistic studies suggest that the nickel catalyst uncommonly plays multiple roles, accomplishing chlorine radical generation, alpha-amino radical capture, cross-coupling, and asym. induction.

Journal of the American Chemical Society published new progress about Benzamides Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Madan, Renu; Goyal, Shikha published the artcile< Temozolomide Induced Cutaneous Reaction.>, Quality Control of 112-63-0, the main research area is .

There is no abstract available for this document.

Neurology India published new progress about 112-63-0. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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