Tag: M.W=150-200

Chaudhari, Moreshwar B. published the artcileSn-Catalyzed Criegee-Type Rearrangement of Peroxyoxindoles Enabled by Catalytic Dual Activation of Esters and Peroxides, Related Products of esters-buliding-blocks, the main research area is peroxy oxindole alkyl ester stannum catalyst Criegee type rearrangement; alkoxy benzoxazinone preparation green chem.

Sn-catalyzed mild protocol was reported for ring expansion of peroxyoxindoles to afford a series of substituted 2H-benzo[b][1,4]oxazin-3(4H)-one derivatives In this protocol, authors showed the in-situ conversion of tert-Bu peroxy compounds into peresters with the aid of external esters, which then underwent the ring-expansion process and the incipient carbocation was trapped with the alc. residue generated from the esters. The reaction was also demonstrated in a continuous flow process.

Journal of Organic Chemistry published new progress about Aliphatic esters 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, Related Products of esters-buliding-blocks.

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

Takashina, Kazuki published the artcileSolid-phase total synthesis of Plusbacin A3, COA of Formula: C9H10O2, the main research area is Plusbacin A3 total solid phase synthesis antibacterial agent drug; Joullie Ugi three component diastereoselective.

The total synthesis of the depsipeptide natural product plusbacin A3 utilizing solid-phase peptide synthesis (SPPS) was disclosed. A 3-hydroxy-proline derivative compatible with Fmoc (Fmoc = 9-fluorenylmethoxycaarbonyl) SPPS was prepared by a diastereoselective Joullie-Ugi three-component reaction (JU-3CR)/hydrolysis sequence. After peptide elongation on the solid support, cleavage of the peptide from the resin, followed by macrolactamization and global deprotection, gave plusbacin A3.

Organic Letters published new progress about Allylic alcohols 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, COA of Formula: C9H10O2.

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

Turhanen, Petri A. published the artcileGreen and Efficient Esterification Method Using Dried Dowex H+/NaI Approach, SDS of cas: 140-11-4, the main research area is green esterification carboxylic acid alc; regioselective esterification hydrogen cation exchange resin sodium iodide catalyst.

The usefulness of dried Dowex H+ cation-exchange resin with or without sodium iodide (NaI) as a catalyst system for different kinds of esterifications using carboxylic acids and alcs. as starting materials has been systematically investigated. The Dowex H+/NaI approach is very effective, generally high yielding, energy-efficient, and nontoxic, and the Dowex H+ resin is reusable. Since the whole procedure from start to product isolation is also very simple, these features make the method environmentally friendly. The method is regioselective, and its potential for separation of valuable carboxylic acids like resin acids from mixtures containing other kinds of carboxylic acids has been demonstrated. Examples for green and straightforward esterification of highly important natural amino acids are also presented.

ACS Omega published new progress about Carboxylic acids 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, SDS of cas: 140-11-4.

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

Li, Nan published the artcileCobalt-Catalyzed Deprotection of Allyl Carboxylic Esters Induced by Hydrogen Atom Transfer, Related Products of esters-buliding-blocks, the main research area is carboxylic acid preparation chemoselective; allyl carboxylic ester deprotection cobalt catalyst.

A brief, efficient method has been developed for the removal of the allyl protecting group from allyl carboxylic esters RC(O)OCH2CH=CH2 (R = cyclohexyl, Ph, thiophen-2-yl, 2H-1,3-benzodioxol-5-yl, etc.) using a Co(II)/TBHP/(Me2SiH)2O catalytic system. This facile strategy displays excellent chemoselectivity, functional group tolerance, and high yields. This transformation probably occurs through the hydrogen atom transfer process, and a Co(III)-six-membered cyclic intermediate is recommended.

Organic Letters published new progress about Carboxylic acids Role: SPN (Synthetic Preparation), PREP (Preparation). 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, Related Products of esters-buliding-blocks.

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

Wei, Duo published the artcileManganese and rhenium-catalyzed selective reduction of esters to aldehydes with hydrosilanes, Quality Control of 110-42-9, the main research area is aldehyde preparation photochem; carboxylic ester reduction manganese rhenium catalyst; triethylsilane carboxylic ester hydrosilylation; alkyl silyl acetal preparation chemoselective photochem.

The selective reduction of esters RC(O)OR1 [R = (4-chlorophenyl)methyl, naphthalen-2-ylmethyl, nonyl, etc.; R1 = Me, Et] to aldehydes RC(O)H (I), via the formation of stable alkyl silyl acetals RCH(OSi(C2H5)3)OR1 (II), for the first time, was achieved with both manganese, -Mn2(CO)10- and rhenium -Re2(CO)10- catalysts in the presence of triethylsilane as reductant. These two methods provide a direct access to a large variety of aliphatic and aromatic alkyl silyl acetals II and to the corresponding aldehydes I upon hydrolysis. The reactions proceeded in excellent yields and high selectivity at room temperature under photo-irradiation conditions (LED, 365 nm, 40 W, 9 h).

Chemical Communications (Cambridge, United Kingdom) published new progress about Acetals Role: SPN (Synthetic Preparation), PREP (Preparation) (silyl). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Quality Control of 110-42-9.

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

Al-Gharibeh, Elyasa published the artcileOxidation kinetics of methyl decanoate in a motored engine, Computed Properties of 110-42-9, the main research area is methyl decanoate motored engine oxidation kinetics.

Low-temperature oxidation of Me decanoate was exptl. investigated in a motored engine. The engine was operated in a premixed mode at a fixed speed of 700 rpm and an intake temperature of 125°C. Compression ratio was varied between 5.5 and 9.0 for an equivalence ratio of 0.25. The study analyzes heat release and stable species concentrations in the oxidation products at each studied compression ratio. A gas chromatograph-mass spectrometer was used to identify and quantify the composition of the exhaust gas. More than sixty stable intermediate species were detected. Quant. concentration measurements were carried out for selected alkenes, aldehydes, ketones, ethers, and alcs. A Fourier transform IR spectrometer was used to detect and quantify carbon monoxide and dioxide. The oxidation process shares features in common with alkane oxidation, with differences related to Me ester intermediates formation specific to Me decanoate oxidation Specifically, the unsaturated ester Me prop-2-enoate was generated in considerable amounts The heat release and speciation trends show two-stage ignition and neg. temperature coefficient features. The exptl. data are also compared to numerical results calculated based on an existing reaction mechanism for Me decanoate.

Fuel published new progress about Acetoxymethyl esters Role: NUU (Other Use, Unclassified), USES (Uses). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Computed Properties of 110-42-9.

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

Mu, Yangxiu published the artcileAcid-catalyzed synthesis of pyrazolo[4,3-c]quinolines from (1H-pyrazol-5-yl)anilines and ethers via the cleavage of C-O bond, Recommanded Product: Benzyl acetate, the main research area is pyrazoloquinoline preparation; pyrazolylaniline ether cyclization carbon oxygen bond cleavage acid catalyst.

Acid-promoted the cyclization reaction for the synthesis of pyrazolo[4,3-c]quinolines from (1H-pyrazol-5-yl)anilines and ethers via the cleavage of C-O bond has been developed. This method exhibits the advantages of good functional group tolerance, simple reaction conditions and without addition of metal catalyst, providing novel products in moderate to good yields, which has potential applications in the organic, pharmaceutical chem.

Tetrahedron published new progress about Anilines Role: RCT (Reactant), RACT (Reactant or Reagent) (pyrazolyl). 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

Cagliero, Cecilia published the artcileCan the selectivity of phosphonium based ionic liquids be exploited as stationary phase for routine gas chromatography? A case study: The use of trihexyl(tetradecyl) phosphonium chloride in the flavor, fragrance and natural product fields, Category: esters-buliding-blocks, the main research area is phosphonium ionic liquid stationary phase GC; Flavors, fragrances and natural products; Gas chromatography; Ionic liquid stationary phases; Phosphonium based ionic liquids; Selectivity, efficiency and operative temperatures.

Room temperature ionic liquids (ILs) are well established stationary phases (SPs) for gas chromatog. (GC) in several fields of applications because of their unique and tunable selectivity, low vapor pressure and volatility, high thermal stability (over 300 °C), and good chromatog. properties. This study is focused on an IL based on a phosphonium derivative (trihexyl(tetradecyl)phosphonium chloride, [P+66614] [Cl-]), previously shown to be suitable as a gas chromatog. SP because of its unique selectivity. In particular, it aims to establish the operative conditions to apply [P+66614][Cl-] to routine anal. of samples containing medium to high volatility analytes with different polarity, organic functional groups and chem. structure. In the first part, the study critically evaluates long term [P+66614][Cl-] column stability and maximum allowable operating temperatures (MAOT). The relatively low MAOT (210 °C) requires the adoption of a dedicated approach for analytes eluting above this temperature based on a suitable combination of efficiency and selectivity, and column characteristics (length, inner diameter and film thickness) and operative conditions. The performance of [P+66614][Cl-] as a GC SP have been validated through the Grob test, a model mixture of 41 compounds of different polarity, structure, and with different organic functional groups in the flavor and fragrance field, a standard mixture of 37 fatty acid Me esters, some essential oils containing pairs or groups of compounds of different volatility critical to sep. in particular peppermint, thyme, oregano, sandalwood and frankincense. The above approach has produced highly satisfactory separations with all of the samples investigated.

Journal of Chromatography A published new progress about Essential oils Role: AMX (Analytical Matrix), ANST (Analytical Study). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Category: esters-buliding-blocks.

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

Niu, Yunwei published the artcileEvaluation of the perceptual interaction among ester aroma compounds in cherry wines by GC-MS, GC-O, odor threshold and sensory analysis: An insight at the molecular level, Formula: C10H20O2, the main research area is wine ester aroma compound; Aroma intensity; Ester compounds; Olfactory threshold; Perceptual interaction.

The ester aroma profiles of five Chinese cherry wines and the perceptual interaction among esters were investigated in this study. 24 esters were identified by Gas chromatog.-olfactometry (GC-O) and Gas Chromatog.-Mass Spectrometer (GC-MS). According to addition/omission anal., seven volatile compounds among them were selected and studied using sensory profiling and multivariate statistic methods such as Principal Component Anal. (PCA). In sensory anal., a significant reduction of olfactory threshold for total aromatic reconstitution was induced by the addition among each of them in Feller’s additive model, which demonstrated their synergistic effects. The σ/τ plot showed that most of them were followed by a partial addition behavior. Furthermore, PCA indicated that the addition among each of them had a significant effect on fruity, floral, sweet and fermentation aroma intensity. Specifically, Et decanoate and Me salicylate at sub-threshold concentrations were also likely to contribute to overall aroma. The results of perceptual interaction were mainly influenced by chem. structure and mol. polarity.

Food Chemistry published new progress about Esters Role: ANT (Analyte), PRP (Properties), ANST (Analytical Study). 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

Niu, Yunwei published the artcileEvaluation of the perceptual interaction among ester aroma compounds in cherry wines by GC-MS, GC-O, odor threshold and sensory analysis: An insight at the molecular level, HPLC of Formula: 111-11-5, the main research area is wine ester aroma compound; Aroma intensity; Ester compounds; Olfactory threshold; Perceptual interaction.

The ester aroma profiles of five Chinese cherry wines and the perceptual interaction among esters were investigated in this study. 24 esters were identified by Gas chromatog.-olfactometry (GC-O) and Gas Chromatog.-Mass Spectrometer (GC-MS). According to addition/omission anal., seven volatile compounds among them were selected and studied using sensory profiling and multivariate statistic methods such as Principal Component Anal. (PCA). In sensory anal., a significant reduction of olfactory threshold for total aromatic reconstitution was induced by the addition among each of them in Feller’s additive model, which demonstrated their synergistic effects. The σ/τ plot showed that most of them were followed by a partial addition behavior. Furthermore, PCA indicated that the addition among each of them had a significant effect on fruity, floral, sweet and fermentation aroma intensity. Specifically, Et decanoate and Me salicylate at sub-threshold concentrations were also likely to contribute to overall aroma. The results of perceptual interaction were mainly influenced by chem. structure and mol. polarity.

Food Chemistry published new progress about Esters Role: ANT (Analyte), PRP (Properties), ANST (Analytical Study). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, HPLC of Formula: 111-11-5.

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