Esters-buliding-blocks

Jung, Jong-Min published the artcileSynthesis of fatty acid methyl esters via non-catalytic transesterification of avocado oil with dimethyl carbonate, Category: esters-buliding-blocks, the main research area is fatty acid methyl ester transesterification avocado oil dimethyl carbonate.

This paper is primarily a case study on transesterification of avocado oil for the synthesis of biodiesel. Many operational parameters and components were studied in an attempt to identify the optimal process for non-catalytic transesterification, and di-Me carbonate (DMC), an acyl acceptor was identified as key to one very efficient methodol. Non-catalytic transesterification experiments using DMC and/or methanol (MeOH) were conducted under varied temperatures and varied amounts of silica loading. The maximum yield of fatty acid Me esters (FAMEs) of 92.96% was shown to be achievable at 380 °C. The miscibility of avocado oil and DMC was seen to be a key factor in providing a strategic means for delaying thermal cracking of FAMEs. Lastly, this study reported that the optimal mass ratio of silica to oil was over 8 at 380 °C.

Energy Conversion and Management published new progress about Avocado oil Role: RCT (Reactant), RACT (Reactant or Reagent). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Category: esters-buliding-blocks.

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

Abo-Ghalia, Mohamed H. published the artcileSynthesis and reactions of new chiral linear and macrocyclic tetra- and penta-peptide candidates, Application of Methyl 2-aminopentanoate hydrochloride, the main research area is cyclic peptide synthesis pyridine dicarboxylic acid; pyridine dicarbonyl dichloride amino acid coupling macrocylization hydrolysis hydrazinolysis.

A series of linear and macrocyclic pentapeptide derivatives have been prepared via the coupling of pyridine-2,6-dicarboxylic acid (I) (R1 = OH) or pyridine-2,6-dicarbonyl dichloride I (R1 = Cl) with appropriate amino acid Me esters. The coupling of I (R1 = OH) or I (R1 = Cl) with amino acid Me esters gave the corresponding pyridine dipeptide Me esters, which were hydrolyzed with sodium hydroxide to the corresponding acids. The latter acids. were coupled with other amino acid Me esters to afford the corresponding tetrapeptide esters, which were hydrolyzed with sodium hydroxide to the corresponding acids. Cyclization of tetrapeptide acids with L-lysine Me ester or with aliphatic diamide derivatives afforded the corresponding cyclic pentapeptide Me ester derivatives and cyclic tetrapeptide diamines, resp. Finally, hydrolysis with 1 N sodium hydroxide or hydrazinolysis with hydrazine hydrate of Me esters afforded the corresponding acids (II) [R1 = CH2CHMe2, R2 = CH2CH2Me, CH2Ph, CH2CHMe2: R1 = CH2Ph, R2 = CH2CHqMe, CH2PH; R3 = OH] and hydrazides II (R3 = NHNH2) , resp.

Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences published new progress about Amino acids Role: RCT (Reactant), RACT (Reactant or Reagent). 10047-10-6 belongs to class esters-buliding-blocks, name is Methyl 2-aminopentanoate hydrochloride, and the molecular formula is C6H14ClNO2, Application of Methyl 2-aminopentanoate hydrochloride.

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

Gardiner, James published the artcileβ-peptide conjugates: Syntheses and CD and NMR investigations of β/α-chimeric peptides, of a DPA-β-decapeptide, and of a PEGylated β-heptapeptide, Related Products of esters-buliding-blocks, the main research area is chimeric peptide dipicolinic acid solid phase synthesis; PEGylated heptapeptide solid phase synthesis; peptide solution mol structure CD NMR helical conformation.

β3-Peptides consisting of six, seven, and ten homologated proteinogenic amino acid residues have been attached to an α-heptapeptide (all D-amino acid residues), to a hexaethylene glycol chain (PEGylation), and to dipicolinic acid (DPA derivative, DPA = dipicolinic acid), resp. The conjugation of the β-peptides with the second component was carried out through the N-termini in all three cases. According to NMR anal. (CD3OH solutions), the (M)-314-helical structure of the β-peptidic segments was unscathed in all three chimeric compounds The α-peptidic section of the α/β-peptide was unstructured, and so was the oligoethylene glycol chain in the PEGylated compound Thus, neither does the appendage influence the β-peptidic secondary structure, nor does the latter cause any order in the attached oligomers to be observed by this method of anal. A similar conclusion may be drawn from CD spectra. These results bode well for the development of delivery systems involving β-peptides.

Helvetica Chimica Acta published new progress about Amino acids Role: RCT (Reactant), RACT (Reactant or Reagent). 882847-32-7 belongs to class esters-buliding-blocks, name is 1-(9H-Fluoren-9-yl)-3-oxo-2,7,10,13,16,19-hexaoxa-4-azadocosan-22-oic acid, and the molecular formula is C28H37NO9, Related Products of esters-buliding-blocks.

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

Shen, Tao published the artcileEfficient, solvent-free aminolysis of monoesters catalyzed by sodium, Category: esters-buliding-blocks, the main research area is ester sodium catalyst aminolysis; amide preparation.

An efficient, solvent-free procedure using sodium as catalyst for the aminolysis of monoesters was reported. A detailed comparison of catalysts between sodium and sodium amide was made. It was found that the fresh sodium amide by in-situ synthesis of sodium with ammonia was more active than the indirectly adding sodium amide. As compared to the previously reported approaches, the procedure given in this work was much faster and performed under mild conditions. Furthermore, this procedure was applied successfully for the aminolysis of other monoesters.

Youji Huaxue published new progress about Amides Role: SPN (Synthetic Preparation), PREP (Preparation). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Category: esters-buliding-blocks.

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

Casas, Fernando published the artcileA Diaminopropane Diolefin Ru(0) Complex Catalyzes Hydrogenation and Dehydrogenation Reactions, Recommanded Product: Ethyl 4-oxopentanoate, the main research area is diolefin diaminopropane ruthenium dehydrogenated iminopropenamide complex catalyst preparation; carboxylic acid preparation; primary alc oxidation diolefin diaminopropane ruthenium complex catalyst; amide preparation; amine primary alc dehydrogenative coupling diolefin diaminopropane ruthenium catalyst; alc amine preparation; ester ketone aldehyde imine olefin hydrogenation DAP ruthenium catalyst.

New ruthenium (0) complexes with a cooperative diolefin diaminopropane (DAP) or dehydrogenated iminopropenamide ligand (IPA) were synthesized for comparison with their diaminoethane (DAE)/diazadiene (DAD) ruthenium analogs. These DAP/IPA complexes were efficient catalysts in dehydrogenation reactions of alk. aqueous methanol which proceeded under mild conditions (T=70 °C) and of higher alcs., forming corresponding carbonate and carboxylates, resp. The scope of reaction included an example of a 1,2-diol as model for biomass derived alcs. Their catalytic applications were extended to atom-efficient dehydrogenative coupling of alcs. and amines to amides. The reaction proceeded without any additives and was applicable to synthesis of formamides from methanol. Moreover, DAP/IPA complexes catalyzed hydrogenation of a series of esters, lactone, ketone, activated olefin, aldehyde and imine substrates. The diaminopropane Ru catalyst I exhibited higher activity compared to dehydrogenated β-ketiminate (IPA) and previously studied DAD/DAE based catalysts. The studies on their stoichiometric reactivity with relevance to their possible catalytic mechanisms and isolation and full characterization of key reaction intermediates were also presented.

ChemCatChem published new progress about Amides Role: SPN (Synthetic Preparation), PREP (Preparation). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Recommanded Product: Ethyl 4-oxopentanoate.

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

Estrada-Ramirez, Alba Nidia published the artcilePoly(n-alkyl methacrylate)s as Metallocene Catalyst Supports in Nonpolar Media, Application of Dodecyl 2-methylacrylate, the main research area is polyalkyl methacrylate metallocene catalyst nonpolar media.

In this work, poly(alkylmethacrylates) based on poly(n-alkyl methacrylate)s (PnAMAs), i.e., poly(hexyl methacrylate) (PHMA), poly(lauryl methacrylate) (PLMA), and poly(stearyl methacrylate) (PSMA), with similar molar masses (Mn), are synthesized via reversible addition-fragmentation chain transfer technique using a high-throughput approach. Analyses by dynamic light scattering (DLS) of PnAMAs in nonpolar solvents show the presence of nanoparticles distributions (unimers or single chains). Interactions of methylaluminoxane (MAO) and MAO/metallocene compounds with PnAMA nanoparticles, lead to self-assembled micellar-like structures useful as “”nanoreactors”” for coordination polymerizations of ethylene. The inverse micellar-like structures of the three kinds of polymethacrylates, formed in the presence of MAO are confirmed by DLS experiments and by transmission electron microscopy using energy dispersive spectrometry analyzer, in dyed PnAMAs/MAO samples. The encapsulation of the metallocene catalyst into the PSMA/MAO nanoparticles reveals stable catalytic systems that have a clear effect on the morphol. of the polyethylenes synthesized through this method.

Macromolecular Chemistry and Physics published new progress about Aluminoxanes, Me Role: CAT (Catalyst Use), USES (Uses) (MAO). 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Application of Dodecyl 2-methylacrylate.

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

Koster, Jesper M. published the artcileActivation of primary and secondary benzylic and tertiary alkyl (sp3)C-F bonds inside a self-assembled molecular container, Formula: C9H16O2, the main research area is activation primary secondary benzylic carbon fluorine bond mol container; acid catalysis; elimination; molecular capsules; supramolecular catalysis; supramolecular chemistry.

Alkyl fluorides are generally regarded as chem. inert. However, several literature examples describe the activation of alkyl (sp3)C-F bonds via strong Bronsted or Lewis acids under harsh conditions. We here report that catalytic amounts of the self-assembled resorcinarene capsule are able to activate alkyl (sp3)C-F bonds under mild conditions (40 °C, no strong Bronsted or Lewis acid present). Kinetic measurements display a sigmoidal reaction progress after an initial induction period. Control experiments indicate that the presence of the supramol. capsule is required for an efficient reaction acceleration.

Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Alkenes Role: SPN (Synthetic Preparation), PREP (Preparation). 39495-82-4 belongs to class esters-buliding-blocks, name is Ethyl 5-methylhex-5-enoate, and the molecular formula is C9H16O2, Formula: C9H16O2.

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

Hendrickson, James B. published the artcileNuclear synthons: mesyltriflone as an olefin polyanion equivalent, Application In Synthesis of 39495-82-4, the main research area is synthon mesyltriflone; regiochem mesyltriflone alkylation; Ramberg Baecklund mesyltriflone elimination; stereochem mesyltriflone elimination.

The title compound, CF3SO2CH2SO2Me, is a nuclear synthon capable first of multiple constructions (e.g., alkylations), and then of Ramberg-Baecklund elimination (to give substituted alkenes). The alkylations are clean and regiospecific, often amenable to one-pot operation, and in most cases the elimination is smooth. A variety of examples establish the scope of the method; the mechanism and stereochem. are discussed.

Journal of the American Chemical Society published new progress about Alkenes Role: SPN (Synthetic Preparation), PREP (Preparation). 39495-82-4 belongs to class esters-buliding-blocks, name is Ethyl 5-methylhex-5-enoate, and the molecular formula is C9H16O2, Application In Synthesis of 39495-82-4.

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

Gaida, Meriem published the artcileModeling approaches for temperature-programmed gas chromatographic retention times under vacuum outlet conditions, Name: Methyl decanoate, the main research area is modeling approach temperature programmed gas chromatog retention time vacuum; Mass spectrometer detector; Method development and optimization; Retention equation; Thermodynamic modeling.

This contribution evaluates the performance of two predictive approaches in calculating temperature-programmed gas chromatog. retention times under vacuum outlet conditions. In the first approach, the predictions are performed according to a thermodn.-based model, while in the second approach the predictions are conducted by using the temperature-programmed retention time equation. These modeling approaches were evaluated on 47 test compounds belonging to different chem. classes, under different exptl. conditions, namely, two modes of gas flow regulation (i.e., constant inlet pressure and constant flow rate), and different temperature programs (i.e., 7°C/min, 5°C/min, and 3°C/min). Both modeling approaches gave satisfactory results and were able to accurately predict the elution profiles of the studied test compounds The thermodn.-based model provided more satisfying results under constant flow rate mode, with average modeling errors of 0.43%, 0.33%, and 0.15% across all the studied temperature programs. Nevertheless, under constant inlet pressure mode, lower modeling errors were achieved when using the temperature-programmed retention time equation, with average modeling errors of 0.18%, 0.18%, and 0.31% across the used temperature programs.

Journal of Chromatography A published new progress about Alkanes Role: ANT (Analyte), ANST (Analytical Study) (C7-C30). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Name: Methyl decanoate.

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

Tang, Bo published the artcileA β-cyclodextrin covalent organic framework used as a chiral stationary phase for chiral separation in gas chromatography, Product Details of C9H18O2, the main research area is cyclodextrin covalent organic framework chiral stationary phase gas chromatog.

Chiral covalent organic frameworks (CCOFs) featuring chirality, stability, and good porosity have attracted a considerable amount of attention due to their important applications, such as asym. catalysis, chiral separation, and chiral recognition. In this study, a β-cyclodextrin (β-CD) covalent organic framework (β-CD-COF) diluted with polysiloxane OV-1701 was explored as a novel chiral stationary phase (CSP) for gas chromatog. (GC) separation of racemates. The β-CD-COF coated capillary column had excellent selectivity, not only for the separation of linear alkanes, linear alcs., fatty acid Me esters mixture, the Grob mixture and positional isomers, but also for the resolution of chiral compounds, including chiral alcs., aldehydes, ethers, and amino acid derivatives In addition, the β-CD-COF-coated capillary column presented good repeatability and reproducibility. This work indicated the great potential of the CCOFs coated capillary column for the chromatog. separation of enantiomers.

Chinese Chemical Letters published new progress about Alcohols, chiral Role: ANT (Analyte), ANST (Analytical Study). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Product Details of C9H18O2.

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