Tag: M.W=150-200

Piryaei, Marzieh published the artcileNew fiber coating with silica-coated γ-Fe2O3 nanoparticles for extraction and determination of volatile compounds of Ziziphora tenuior L., Recommanded Product: Benzyl acetate, the main research area is silica coated iron oxide nanoparticle volatile compound determination extraction.

The present study synthesized the silica-coated γ-Fe2O3 nanoparticles (NPs) with a large surface area and employed it as a novel fiber coating for extracting and determining volatile compounds from Ziziphora tenuior in a min. period of time without using solvents with head solid-phase microextraction The simplex approach was applied to optimize all parameters concurrently. Major optimized parameters include temperature, extraction time, and sample weight In optimal circumstances, the repeatability for one fiber (n=5) was at the range of 2.8-9.2 percent for the sample compounds, which is given as relative standard division (R.S.D. %). The approach suggested in this work provides advantages such as simple usage, short anal. time, cheaper equipment, high relative recovery, and fiber thermal stability compared to common anal. approaches. Our findings indicated that γ-Fe2O3@SiO2-PW fibers are appropriate for the HS-SPME anal. of essential oils.

Nanochemistry Research published new progress about Essential oils Role: ANT (Analyte), ANST (Analytical Study). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Recommanded Product: Benzyl acetate.

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

Homma, Chihiro published the artcileSynthesis of alkynyl Z-ketimines and their application in amine-catalyzed asymmetric Mannich reactions and conjugate addition, Formula: C7H13NO3, the main research area is alkynyl ketimine amine catalyst enantioselective Mannich reaction conjugate addition.

A facile and practical synthesis of various alkynyl Z-ketimines, which was used as a synthetic equivalent of alkyl ketimines was developed. The obtained alkynyl Z-ketimines was successfully applied in enantioselective Mannich reaction and conjugate addition catalyzed by a chiral amine with an acid functionality.

Tetrahedron published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 120157-98-4 belongs to class esters-buliding-blocks, name is tert-Butyl acetylcarbamate, and the molecular formula is C7H13NO3, Formula: C7H13NO3.

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

Zhang, Guoqi published the artcileRedox-Noninnocent Ligand-Supported Vanadium Catalysts for the Chemoselective Reduction of C=X (X = O, N) Functionalities, Safety of Methyl octanoate, the main research area is vanadium ligand catalyst reduction ketone aldehyde imine ester carboxamide.

Catalysis is the second largest application for V after its use as an additive to improve steel production Mol. complexes of vanadium(V) are particularly useful and efficient catalysts for oxidation processes; however, their ability to catalyze reductive transformations has yet to be fully explored. Here the authors report the first examples of polar organic functionality reduction mediated by V. Open-shell VIII complexes that feature a π-radical monoanionic 2,2′:6′,2”-terpyridine ligand (Rtpyâ€?- functionalized at the 4′-position (R = (CH3)3SiCH2, Ph) catalyze mild and chemoselective hydroboration and hydrosilylation of functionalized ketones, aldehydes, imines, esters, and carboxamides with turnover numbers (TONs) of up to âˆ?000 and turnover frequencies (TOFs) of up to âˆ?00 h-1. Computational evaluation of the precatalyst synthesis and activation revealed underappreciated complexity associated with the redox-active tpy chelate.

Journal of the American Chemical Society published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Safety of Methyl octanoate.

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

Li, Rui published the artcileCarbon-Sulfur Bond Formation: Tandem Process for the Synthesis of Functionalized Isothiazoles, Computed Properties of 140-11-4, the main research area is isothiazole preparation; aldehyde tert butanesulfinamide acetic anhydride tandem reaction.

In this paper, a new process for the construction of 3,4,5-substituted isothiazoles via reaction cascades including Pummerer-like rearrangement, nucleophilic condensation, and sulfenamide cyclization followed by concomitant elimination and dehydration under mild reaction conditions is reported. This process provides isothiazoles bearing fluorine and other functional groups in good to excellent yields from readily available starting materials.

Organic Letters published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Computed Properties of 140-11-4.

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

Zhang, Lumin published the artcileCarbene reactivity from alkyl and aryl aldehydes, Product Details of C9H10O2, the main research area is aldehyde carbene reactivity chemoselective diastereoselective dimerization coupling heterocyclization deoxygenation; insertion ring expansion rearrangement.

Common aldehydes were readily converted (via stable α-acyloxy halide intermediates) to electronically diverse (donor or neutral) carbenes to facilitate >10 reaction classes was reported. This strategy enabled safe reactivity of nonstabilized carbenes from alkyl, aryl and formyl aldehydes via zinc carbenoids. Earth-abundant metal salts [iron(II) chloride, cobalt(II) chloride, copper(I) chloride] were effective catalysts for these chemoselective carbene additions to σ and π bonds.

Science (Washington, DC, United States) published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Product Details of C9H10O2.

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

Hojo, Makoto published the artcileReductive Generation of Enolates Using a Chromium(III) Ate-Type Reagent as a Reductant and Reactions of the Enolates with Electrophiles, Category: esters-buliding-blocks, the main research area is chromium ate reagent ketone ester enolate formation reaction electrophile; stereoselective reaction ketone ester enolate aldehyde chromium ate reagent; aldehyde reaction ketone ester enolate chromium ate reagent; alkyl halide reaction ketone ester enolate chromium ate reagent; chemoselective reaction enolate keto ester chromium ate reagent; imine reaction enolate bromoacetate chromium ate reagent; cross aldol adduct synthesis chromium ate reagent.

The Cr ate-type reagent Bu6CrLi3 reacted cleanly with ketones and esters bearing a leaving group at the α-position to produce enolates under mild conditions, where the Cr ate reagent acts as a formal two-electron reductant. In a stepwise manner, the generated enolates reacted with a variety of electrophiles with high selectivity. In general, a well-dried 50 mL two-necked round bottom flask containing a magnetic stirring bar and ground Cr(III) chloride (0.52 mmol) was fitted with a rubber septum and a three-way stopcock connected to a balloon filled with Ar. The apparatus was purged with Ar by pumping-filling via a three-way stopcock. THF (4 mL) was introduced to the flask via a syringe, and the suspension was stirred at room temperature for 5 min. The flask was cooled to -78°, and a solution of BuLi in hexane (3.12 mmol; 1.57 M) was slowly added to the suspension, and the mixture was stirred for further 30 min at -78°. Enolate precursor (0.5 mmol) was added slowly to the mixture at -20 to -78°. After stirring for the specified period of time, an electrophile (3.64 mmol) was added to the mixture The reaction mixture was once cooled to -78°, and the reaction was quenched with a saturated solution of aqueous ammonium chloride at -78°. After extraction with ether, washing the ethereal solution with aqueous NaHCO3, and drying on Na2SO4, solvents were evaporated A crude mixture was subjected to chromatog. on silica gel to afford a pure product. For example, Et 2-bromopropionate and HexCHO gave 88% 3-hydroxy-2-methylnonanoic acid Et ester (80/20 syn/anti); Et 2-bromoisobutyrate and OctI gave 96% 2,2-dimethyldecanoic acid Et ester; Et 2-bromoisobutyrate and PhCH:NTs gave 88% 2,2-dimethyl-3-phenyl-3-(toluene-4-sulfonylamino)propionic acid Et ester; α,α-dibromobutyrophenone and EtCHO gave 29% (2,3-diethyloxiranyl)phenylmethanone, 23% 2-ethyl-1-phenylpent-2-en-1-one and 36% syn-2-ethyl-3-hydroxy-1-phenylpentan-1-one.

Organometallics published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Category: esters-buliding-blocks.

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

Arata, Shogo published the artcileAn isolable iron(II) bis(supersilyl) complex as an effective catalyst for reduction reactions, Application In Synthesis of 140-11-4, the main research area is iron supersilyl complex catalyst preparation crystal structure; hydrosilylation reductive silylation catalyst iron supersilyl complex.

An isolable 14-electron iron bis(supersilyl) complex, Fe[Si(SiMe3)3]2(THF)2, was successfully synthesized from the reaction of FeBr2 with K[Si(SiMe3)3] and its structure was unambiguously determined by single-crystal x-ray diffraction anal. The complex is coordinatively unsaturated and exhibits high catalytic activity toward the hydrosilylation of carbonyl compounds and the reductive silylation of dinitrogen.

Dalton Transactions published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, Application In Synthesis of 140-11-4.

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

Singh, Randolph R. published the artcileExpanded coverage of non-targeted LC-HRMS using atmospheric pressure chemical ionization: a case study with ENTACT mixtures, HPLC of Formula: 110-42-9, the main research area is liquid chromatog HRMS atm pressure chem ionization ENTACT; Atmospheric pressure chemical ionization (APCI); EPA’s Non-Targeted Analysis Collaborative Trial (ENTACT); Electrospray ionization (ESI); High-resolution mass spectrometry (HRMS); Non-targeted analysis (NTA).

Non-targeted anal. (NTA) is a rapidly evolving anal. technique with numerous opportunities to improve and expand instrumental and data anal. methods. NTA was performed on eight synthetic mixtures containing 1264 unique chem. substances from the U. S. Environmental Protection Agency’s Non-Targeted Anal. Collaborative Trial (ENTACT). These mixtures were analyzed by atm. pressure chem. ionization (APCI) and electrospray ionization (ESI) using both pos. and neg. polarities for a total of four modes. Out of the 1264 ENTACT chem. substances, 1116 were detected in at least one ionization mode, 185 chems. were detected using all four ionization modes, whereas 148 were not detected. Forty-four chems. were detected only by APCI, and 181 were detected only by ESI. Mol. descriptors and physicochem. properties were used to assess which ionization type was preferred for a given compound One ToxPrint substructure (naphthalene group) is enriched in compounds only detected using APCI, and eight ToxPrints (e.g., several alc. moieties) were enriched in compounds only detected using ESI. Examination of physicochem. parameters for ENTACT chems. suggests that those with higher aqueous solubility preferentially ionized by ESI-. While ESI typically detects a larger number of compounds, APCI offers chromatograms with less background, fewer coelutions, and addnl. chem. space coverage, suggesting both should be considered for broader coverage in future NTA research.

Analytical and Bioanalytical Chemistry published new progress about Atmospheric pressure chemical ionization mass spectrometry. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, HPLC of Formula: 110-42-9.

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 C11H22O2, 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). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Product Details of C11H22O2.

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