Category: esters-buliding-blocks

Luginina, Jevgenija; Vasiljevs, Deniss; Ivanovs, Ilgvalds; Mishnev, Anatoly; Turks, Maris published the artcile< Diastereoselective aza-Michael addition for synthesis of carbohydrate-derived spiropiperazinones>, Quality Control of 2743-40-0, the main research area is glycoside spiropiperazinone diastereoselective synthesis aza Michael addition; aza Michael addition nitromethylene glucofuranoside amino acid ester.

3-Deoxy-3-C-nitromethylene-1,2:5,6-di-O-isopropylidene-α-D-glucofuranose reacts with amino acid esters according to the aza-Michael addition pathway. The obtained adducts after reduction of the nitro group spontaneously lactamize and provide novel carbohydrate-derived spiropiperazinones.

Monatshefte fuer Chemie published new progress about Amino acid esters Role: RCT (Reactant), RACT (Reactant or Reagent). 2743-40-0 belongs to class esters-buliding-blocks, and the molecular formula is C8H18ClNO2, Quality Control of 2743-40-0.

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

Aziz, Nur Atiqah Mohamad; Yunus, Robiah; Hamid, Hamidah Abd; Ghassan, Alsultan Abdul Kareem; Omar, Rozita; Rashid, Umer; Abbas, Zulkifly published the artcile< An acceleration of microwave-assisted transesterification of palm oil-based methyl ester into trimethylolpropane ester>, Application of C19H34O2, the main research area is palm oil fatty acid trimethylolpropane ester preparation transesterification.

Microwave-assisted synthesis is known to accelerate the transesterification process and address the issues associated with the conventional thermal process, such as the processing time and the energy input requirement. Herein, the effect of microwave irradiation on the transesterification of palm oil Me ester (PME) with trimethylolpropane (TMP) was evaluated. The reaction system was investigated through five process parameters, which were reaction temperature, catalyst, time, molar ratio of TMP to PME and vacuum pressure. The yield of TMP triester at 66.9 weight% and undesirable fatty soap at 17.4% were obtained at 130°C, 10 mbar, sodium methoxide solution at 0.6 weight%, 10 min reaction time and molar ratio of TMP to PME at 1:4. The transesterification of palm oil-based Me ester to trimethylolpropane ester was 3.1 folds faster in the presence of microwave irradiation The total energy requirement was markedly reduced as compared to the conventional heating method. The findings indicate that microwave-assisted transesterification could probably be an answer to the quest for a cheaper biodegradable biolubricant.

Scientific Reports published new progress about Activation energy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application of C19H34O2.

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

Xiang, Hao; Xia, Huiyun; Chen, Huaxin; Mi, Haichen published the artcile< Influence of moisture-curing reaction on the mechanical properties of one-component polyurethane mixtures>, Electric Literature of 112-63-0, the main research area is polyurethane curing reaction mech property.

One-component, moisture-curing polyurethane mixture is a potential cold repair material for pavement because of its simple application method and excellent road performance. However, a large amount of CO2 is produced in the moisture-curing reaction of polyurethane, which destroys the mixture’s interlocked-denseness structure and reduces its mech. properties. In this paper, a one-component polyurethane mixture with AC-13 gradation was prepared, and the mixture used the one-component polyurethane synthesized with diphenylmethane diisocyanate and polyether polyol as the binder. The Marshall stability of the mixture was tested according to polyurethane content, temperature, air humidity, and number of compactions. Results showed that polyurethane content, moisture-curing rate of the polyurethane mixture, and mixture air-void content are key factors affecting the Marshall stability of a polyurethane mixture When the polyurethane content was 5.5%, the polyurethane mixture had the highest mech. strength. As the content of polyurethane increased, more CO2 accumulated in the mixture and the mixture strength decreased. When the polyurethane content was increased by 1.5%, the Marshall stability of the mixture was reduced by 41.8%. The increase of temperature and air humidity accelerated the moisture-curing rate of polyurethane, accelerating the production of CO2, and reducing the Marshall stability of the mixture When the temperature rose from 0 to 60°C and the air relative humidity increased from 30 to 90%, the expansion rate of the mixture increased by 247.55% and 40.08%, resp., while the Marshall stability decreased by 17.8% and 11.16%, resp. At appropriate polyurethane content and curing conditions, a higher number of compactions enhanced the interlocked-denseness structure of the mixture, which improved the Marshall stability. As the number of compactions increased from 40 to 70, the air-void content of the polyurethane mixture was reduced by 44.99%, and the Marshall stability was increased by 157.36%. This paper serves as a reference study for the application of one-component, moisture-curing polyurethane mixtures

Journal of Materials Science published new progress about Absorption. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

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

Zhao, Tingting; Ju, Zhaoyang; Zhang, Yuxuan; Han, Lujia; Xiao, Weihua published the artcile< Specific role of aluminum site on the activation of carbonyl groups of methyl levulinate over Al(OiPr)3 for γ-valerolactone production>, Related Products of 112-63-0, the main research area is valerolactone methyl levulinate production aluminum isopropoxide activation.

The high-efficiency synthesis of biofuel γ-valerolactone (GVL) from biomass-derived levulinates is a challenging task. The Meerwein-Ponndorf-Verley (MPV) reduction with its extraordinary chemoselectivity is advantageous for the hydrogenation process, compared to the mol.-hydrogen-based process using noble metal catalysts. Therefore, we used a classical Al-based isopropoxide to catalyze transfer hydrogenation (CHT) of Me levulinate (ML) to GVL. A high yield of GVL up to 97.6% could be achieved using 2-proponal as the H-donor and solvent under mild conditions (150°C, 30 min). Besides, three reaction stages were observed in the conversion, including transesterification, hydrogenation and cyclization. LC/MS anal. and the d. functional theory (DFT) caculations revealed that Al atom of Al(OiPr)3 as the electron transfer center activated ester carbonyl of the substrate via fourmembered transition states before activating the ketone carbonyl, resulting in the occurrence of transesterification prior to the hydrogenation. In addition, 2-propanol as proton transfer carrier assisting the cyclization process was proved to be the lowest-energy pathway. Our work shed light on the role of Al(OiPr)3 in the MPV reduction of ML, providing a comprehensive understanding on the metal alkoxide catalysis mechanism for GVL production

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Hydrogenation. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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

Nogales-Delgado, Sergio; Encinar, Jose Maria; Gonzalez Cortes, Alvaro published the artcile< High oleic safflower oil as a feedstock for stable biodiesel and biolubricant production>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is biodiesel biolubricant oleic acid safflower oil feedstock.

Biodiesel and other derivative compounds which could act as biolubricants, can be a suitable alternative for petroleum products, which are less sustainable and harmful to the environment. However, especially when vegetable oils are used as raw materials (for instance Carthamus Tinctorius), these products can show poor oxidative stabilities, depending on their fatty acid composition Apart from adding antioxidants as additives, a good alternative might be the use of genetically modified seeds to facilitate high ratios of stable fatty acids like oleic acid. The aim of this work was to produce biodiesel and biolubricant from high oleic safflower through transesterification with methanol and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, resp. The efficiency of these processes and the quality characterization of biodiesel and biolubricant were assessed. As a result, the biodiesel obtained (HOSBD) complied with the standard, with a high oxidative stability value (8.2 h) and not requiring any antioxidant addition The biolubricant obtained (HOSBL) showed higher oxidative stability (6.72 h) compared to their equivalent produced from rapeseed (Brassica Napus) or cardoon (Cynara Cardunculus L.). Consequently, two stable bioproducts were obtained and the role of fatty acid composition of raw material was vital (oleic/linoleic ratio had a strong influence on oxidative stability). In that sense, the use of stable raw materials like high oleic safflower might avoid antioxidant addition in biodiesel or biolubricants, which implies a cleaner and more sustainable production

Industrial Crops and Products published new progress about Artichoke. 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

George, Subi J.; de Greef, Tom F. A.; Bovee, Ralf; van Dongen, Joost L. J.; Schenning, Albertus P. H. J.; Meijer, E. W. published the artcile< Photodimerization processes in self-assembled chiral oligo(p-phenylenevinylene) bolaamphiphiles>, Formula: C19H34O2, the main research area is photodimerization self assembled chiral oligo phenylenevinylene bolaamphiphile; monolayer surfactant stereoselective photochem cycloaddition.

An oligo(p-phenylene vinylene) (OPV) amphiphile has been synthesized with a pos. charged head group on one end and a hydrophilic ethyleneglycol wedge on the other. In water, this bolaamphiphile forms vesicles consisting of a monolayer in which the OPV surfactants are organized in a helical head-to-tail fashion. Mass spectrometry anal. and reversed-phase high performance liquid chromatog. (RP-HPLC) reveals that because of the presence of two double bonds in the OPV units, photo-induced [2+2] cycloaddition takes place resulting in polymerization of the surfactants. Performing RP-HPLC allowed the OPV dimer to be isolated in a sufficient amount to perform a variety of one- and two-dimensional NMR experiments These experiments show a highly stereoselective photochem. cycloaddition process resulting in a regioselective head-to-tail dimerization with a stereoselective syn arrangement.

Chemistry – An Asian Journal published new progress about Amphiphiles. 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

Bamisha, P.; Sreekumar, Anjana; Gopinath, Anjana; Aswathy, V.; Ujwal Dev, M.; Santhosh, Sona; Sivan, Akhil published the artcile< An easy access to 2,3-dihydrofuran derivatives by oxidative cyclization reactions>, HPLC of Formula: 94-02-0, the main research area is dicarbonyl compound methylcinnamate CAN oxidative radical cyclization green chem; acyl phenyldihydrofuran carboxylate preparation.

An easy and simple access to 2,3-dihydrofuran derivatives from 1,3-dicarbonyl compounds and Me cinnamate was reported. The reaction was facilitated by the CAN mediated oxidative free radical cyclization reaction. Moderate to good yields of products were obtained and preliminary studies of these showed potential medicinal activities. These compounds also find application in material chem. and in dyes.

Materials Today: Proceedings published new progress about 1,3-Dicarbonyl compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, HPLC of Formula: 94-02-0.

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

Markovic, Rade; Baranac, Marija; Dzambaski, Zdravko published the artcile< Facile rearrangement of push-pull 5-substituted 4-oxothiazolidines induced by pyridinium hydrobromide perbromide under homogeneous reaction conditions>, Category: esters-buliding-blocks, the main research area is rearrangement push pull oxothiazolidine pyridinium hydrobromide perbromide; substituted alkylidene oxothiazolidine bromination rearrangement pyridinium hydrobromide perbromide; thiazolidine delocalized exocyclic double bond preparation.

Pyridinium hydrobromide perbromide (PHBP) is a highly efficient reagent for the conversion of 5-substituted-2-alkylidene-4-oxothiazolidine derivatives to the corresponding thiazolidines with two fully delocalized exocyclic double bonds at the C(2) and C(5) positions. This conversion as a two-step bromination-rearrangement process occurs in acetonitrile under homogeneous reaction conditions.

Journal of the Serbian Chemical Society published new progress about Bromination (rearrangement and). 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

Power, David P.; Lozach, Olivier; Meijer, Laurent; Grayson, David H.; Connon, Stephen J. published the artcile< Concise synthesis and CDK/GSK inhibitory activity of the missing 9-azapaullones>, Related Products of 112-63-0, the main research area is azapaullones preparation CDK GSK inhibitor.

A remarkably concise, chromatog.-free route to the parent compound of the paullone family of cyclin-dependent kinase (CDK) inhibitors is reported. A similar strategy allowed the synthesis of the hitherto missing 9-azapaullone and its protonated, N-oxidized and N-alkylated derivatives Screening studies identified an active and strongly selective inhibitor of CDK9/cyclin T.

Bioorganic & Medicinal Chemistry Letters published new progress about Enzyme inhibitors. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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

Liljeblad, Arto; Kanerva, Liisa T. published the artcile< Enzymatic methods for the preparation of enantiopure malic and aspartic acid derivatives in organic solvents>, Synthetic Route of 617-55-0, the main research area is kinetic resolution malic aspartic acid lipase.

The kinetic resolution of malic and aspartic acid diesters as well as of N-butanoylaspartic acid di-Me ester by highly regioselective lipases and acylase I enzymes were studied. Candida antarctica lipase A on Celite catalyzed the enantioselective acylation of the hydroxyl and amino groups. Acylase I from Aspergillus melleus and Candida antarctica lipase B catalyzed the enantioselective alcoholysis of the ester groups at the α- and β-positions, resp.

Tetrahedron: Asymmetry published new progress about Kinetic resolution. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Synthetic Route of 617-55-0.

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