Tag: M.W=150-200

Wang, Xin published the artcileSystematic study of the material, structure and lacquering techniques of lacquered wooden coffins from the Eastern Regius Tombs of the Qing Dynasty, China, SDS of cas: 111-11-5, the main research area is mercury sulfide lacquered wooden coffin lacquering pigment.

This paper presents a series of detailed anal. results from lacquered wooden coffins of Emperor Qianlong’s concubines (Huixian, Shujia) and second empress (Wulanala) excavated from the Eastern Regius Tombs of the Qing Dynasty, China. The anal. is focused on the materials used in the lacquered wooden coffins, specifically investigating the pigments, lacquers, organic additives and lacquering techniques using digital microscopy, SEM-EDS, XRD, micro-Raman spectroscopy, FT-IR and THM-Py-GC/MS. The results demonstrate that the mineral pigments were mainly HgS, As2S3, the golden area in the lacquer film layers mainly contained elements Au and Ag, the lacquer ash layers mainly included several layers of stucco and fiber layers arranged alternately, the lacquer sap was urushi, and heat-bodied tung oil was also present in the lacquer. Furthermore, several kinds of lacquering techniques, which demonstrated traditional Chinese lacquering and the rigid hierarchy of funerals in feudal dynasties, are also identified in this investigation.

Microchemical Journal published new progress about Attenuated-total-reflectance Fourier-transform IR spectroscopy. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, SDS of cas: 111-11-5.

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

Zhang, Yihan published the artcileZinc-triggered photocatalytic selective synthesis of benzyl acetate on inverse spinel CuFe2O4 3D networks: a case of coupled redox photocatalytic reaction, Category: esters-buliding-blocks, the main research area is benzyl acetate preparation DFT; benzaldehyde zinc triggered copper iron oxide photocatalyst coupled redox.

Herein, a Zn-doped CuFe2O4 3D network for the coupled redox photocatalytic (CRP) reaction to generate benzyl acetates I [R = Ph, 4-MeC6H4, 4-ClC6H4, etc.] with high selectivity was developed. The ammonia assisted sol-gel method helped to improve the sp. surface area of inverse spinel CuFe2O4 and therefore the concentration of oxygen vacancies. With an optimized doping content of 0.5%, Zn-doped CuFe2O4 presented a photocurrent as high as 34.72μA cm-2, which indicated that Zn-doping largely boosted the charge separation efficiency in accordance with the surface photovoltage measurement. Most importantly, in the CRP reaction, zinc triggered the selectivity of benzaldehyde to benzyl acetate from 2.97% to 74.80%. D. functional theory (DFT) calculations further revealed that zinc doping enhanced the adsorption energy of the intermediate product of acetone in CuFe2O4-based CRP reaction leading to enhanced activity and selectivity.

Materials Advances published new progress about Benzaldehydes 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, Category: esters-buliding-blocks.

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

Olivier, Wesley J. published the artcileBronsted acid-mediated annulations of pyrroles featuring N-tethered α,β-unsaturated ketones and esters: Total syntheses of (±)-tashiromine and (±)-indolizidine 209I, Quality Control of 10047-10-6, the main research area is tashiromine total synthesis pyrrole Bronsted acid mediated annulation; indolizidine 209I total synthesis pyrrole Bronsted acid mediated annulation.

This study provides the first report of the construction of tetrahydroindolizines and tetrahydropyrrolo[1,2-a]azepines via Bronsted acid-mediated annulation of pyrroles featuring N-tethered α,β-unsaturated esters. In addition, the Bronsted acid-catalyzed cyclization of pyrroles featuring pendant α,β-unsaturated ketones was applied to complete total syntheses of the indolizidine alkaloids (±)-tashiromine (I) and (±)-indolizidine 209I (II).

Tetrahedron published new progress about Bronsted acids Role: RGT (Reagent), 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, Quality Control of 10047-10-6.

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

Xu, Qi published the artcileVisible-Light-Induced Sulfur-Alkenylation of Alkenes, COA of Formula: C10H10O2, the main research area is dialkyl butenedithiol preparation diastereoselective regioselective; alkene ketene dithioacetal sulfur alkenylation trimethylphenylacridinium perchlorate photoredox catalyst.

A visible-light-induced intermol. sulfur-alkenylation of alkenes RCH=CR1R2 (R = H, Me, ethyl; R1 = H, Me, ethyl; R2 = Et, Ph, 2-naphthyl, acetyloxy, etc.; R1R2 = -(CH2)4-, -(CH2)5-; RR2 = -(CH2)3-, -(CH2)4-, -(CH2)2CH=CH-, etc.), 6,6-dimethyl-2-methylene-bicyclo[3.1.1]heptane including both activated and unactivated alkenes, mols. even induced by sunlight under ambient conditions is described. This sulfur-alkenylation reaction proceed in a highly regio- and stereospecific manner involving the visible-light-induced conversion of a ketene dithioacetal to the thiavinyl 1,3-dipole intermediate, followed by a formal [3+2] cycloaddition and C-S bond cleavage. Furthermore, it is also an efficient approach for the late-stage functionalization of natural products and complex mols., even being induced by sunlight under ambient conditions.

Organic Letters published new progress about [3+2] Cycloaddition reaction catalysts (stereo-, regioselective). 583-04-0 belongs to class esters-buliding-blocks, name is Allyl benzoate, and the molecular formula is C10H10O2, COA of Formula: C10H10O2.

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

Sanchez, Carlos published the artcileProfiling of Organic Compounds in Bioethanol Samples of Different Nature and the Related Fractions, Computed Properties of 123-29-5, the main research area is bioethanol VOC gas chromatog mass spectrometry flame ionization detection.

Forty-one bioethanol real samples and related fractions, together with a biobutanol sample, have been analyzed with gas chromatog. coupled to either mass spectrometry (GC-MS) or flame ionization detection (GC-FID). Bioethanol with different water contents, samples originated from several sources of biomass, first- as well as second-generation specimens, distillation fractions, samples stocked in containers made of four different materials, and, finally, a biobutanol sample have been analyzed. The number of the compounds found through GC-MS has been 130, including alcs., aldehydes, ketones, esters, ethers, nitrogen compounds, organic acids, furane derivates as well as other species (e.g., limonene). Afterward, a quant. determination of major components of bioethanol has been carried out. The achieved results have revealed that, besides ethanol and, in some cases, water, species such as acetaldehyde, methanol, and higher alcs., as well as 1,1-diethoxyethane, may be present at concentrations above 500 mg L-1. While the source of bioethanol (nature of the raw material, ethanol generation, or water content) has a direct impact on its volatile organic compound (VOC) profile, the material of the container where the biofuel has been stored does not play a significant role. Finally, the results have demonstrated that, for a given production process, different distillation fractions contain unequal VOC profiles.

ACS Omega published new progress about Alcohols Role: OCU (Occurrence, Unclassified), OCCU (Occurrence). 123-29-5 belongs to class esters-buliding-blocks, name is Ethyl nonanoate, and the molecular formula is C11H22O2, Computed Properties of 123-29-5.

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

Sanchez, Carlos published the artcileProfiling of Organic Compounds in Bioethanol Samples of Different Nature and the Related Fractions, Synthetic Route of 106-32-1, the main research area is bioethanol VOC gas chromatog mass spectrometry flame ionization detection.

Forty-one bioethanol real samples and related fractions, together with a biobutanol sample, have been analyzed with gas chromatog. coupled to either mass spectrometry (GC-MS) or flame ionization detection (GC-FID). Bioethanol with different water contents, samples originated from several sources of biomass, first- as well as second-generation specimens, distillation fractions, samples stocked in containers made of four different materials, and, finally, a biobutanol sample have been analyzed. The number of the compounds found through GC-MS has been 130, including alcs., aldehydes, ketones, esters, ethers, nitrogen compounds, organic acids, furane derivates as well as other species (e.g., limonene). Afterward, a quant. determination of major components of bioethanol has been carried out. The achieved results have revealed that, besides ethanol and, in some cases, water, species such as acetaldehyde, methanol, and higher alcs., as well as 1,1-diethoxyethane, may be present at concentrations above 500 mg L-1. While the source of bioethanol (nature of the raw material, ethanol generation, or water content) has a direct impact on its volatile organic compound (VOC) profile, the material of the container where the biofuel has been stored does not play a significant role. Finally, the results have demonstrated that, for a given production process, different distillation fractions contain unequal VOC profiles.

ACS Omega published new progress about Alcohols Role: OCU (Occurrence, Unclassified), OCCU (Occurrence). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Synthetic Route of 106-32-1.

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

Keshavarz, Mosadegh published the artcileNovel SO3H-functionalized polyoxometalate-based ionic liquids as highly efficient catalysts for esterification reaction, Related Products of esters-buliding-blocks, the main research area is sulfonic acid functionalized phosphotungstate ionic liquid preparation thermal stability; carboxylic acid aliphatic alc ionic liquid catalyst esterification; ester preparation.

Three novel heteropolyanion-based Bronsted acidic ionic liquids (BAILs) (PhBs1)3PW, [PipBs1]3PW and [PipBs2]3(PW)2 [PW = PW12O403-; PhBs1 = 4-(1,10-phenanthrolinium)butanesulfonic acid; PipBs1 = 4-(1,4-dimethylpiperazinium)butanesulfonic acid; PipBs2 = 1,4-(1,4-dimethylpiperazinium)bis(butanesulfonic acid)] were synthesized and characterized using FTIR, 1H and 13C NMR, electrospray ionization mass spectrometry, elemental anal., EDX and TG anal. techniques. The esterification reactions of monocarboxylic acids with monohydric alcs. were carried out using these catalysts. After reactions, the catalysts can be readily recovered by decantation or filtration and reused up to 6 times without significant loss of activity. Moreover, bis(sulfoacid)-functionalized 1,4-dimethylpiperazinium phosphotungstate [PipBs2]3(PW)2 showed the best catalytic performance among the prepared catalysts for the esterification reaction.

Journal of Molecular Structure published new progress about Aliphatic 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, Related Products of esters-buliding-blocks.

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

He, Yongrui published the artcileSeparation performance of a new triptycene-based stationary phase with polyethylene glycol units and its application to analysis of the essential oil of Osmanthus fragrans Lour, SDS of cas: 110-42-9, the main research area is Osmanthu essential oil gase chromatog stationary phase triptycene PEG; Essential oil; Gas chromatography; Operational temperature range; Structural and positional isomers; Triptycene-based stationary phase.

This work presents a new triptycene-based stationary phase (TP-PEG) combining the three-dimensional (3D) triptycene (TP) framework with polyethylene glycol (PEG) moieties for gas chromatog. (GC) separations Its statically coated capillary column showed high column efficiency of 5263 plates/m determined by naphthalene at 120°C. Its Rohrschneider-McReynolds constants and Abraham solvation system constants were measured to characterize its polarity and mol. interactions with analytes of different types. As evidenced, the TP-PEG column showed high-resolution performance for the isomers of anilines, phenols, halobenzenes and alkanes with distinct advantages over the PEG columns, particularly those critical isomers such as 3,5-/2,3-xylidine (R = 2.94), m-/p-chlorotoluene (R = 1.92), p-/m-cresol (R = 1.89), 2,2-dimethylbutane/2-methylpentane (R = 1.51), 2,2,3-trimethylbutane /2,3-dimethyl pentane (R = 1.74) and 2,3-dimethylpentane/n-heptane (R = 1.92). In addition, it exhibited good column repeatability and reproducibility with the relative standard deviation (RSD) values of 0.02%-0.09% for run-to-run, 0.13%-0.22% for day-to-day and 2.7%-4.1% for column-to-column, resp., and a wide operational temperature range (30°C-280°C) . Its application to GC-MS anal. of the essential oil of Osmanthus fragrans has proven its good potential for practical anal. of complex samples.

Journal of Chromatography A published new progress about Alkanes Role: PUR (Purification or Recovery), PREP (Preparation). 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, SDS of cas: 110-42-9.

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

He, Yongrui published the artcileSeparation performance of a new triptycene-based stationary phase with polyethylene glycol units and its application to analysis of the essential oil of Osmanthus fragrans Lour, Recommanded Product: Methyl octanoate, the main research area is Osmanthu essential oil gase chromatog stationary phase triptycene PEG; Essential oil; Gas chromatography; Operational temperature range; Structural and positional isomers; Triptycene-based stationary phase.

This work presents a new triptycene-based stationary phase (TP-PEG) combining the three-dimensional (3D) triptycene (TP) framework with polyethylene glycol (PEG) moieties for gas chromatog. (GC) separations Its statically coated capillary column showed high column efficiency of 5263 plates/m determined by naphthalene at 120°C. Its Rohrschneider-McReynolds constants and Abraham solvation system constants were measured to characterize its polarity and mol. interactions with analytes of different types. As evidenced, the TP-PEG column showed high-resolution performance for the isomers of anilines, phenols, halobenzenes and alkanes with distinct advantages over the PEG columns, particularly those critical isomers such as 3,5-/2,3-xylidine (R = 2.94), m-/p-chlorotoluene (R = 1.92), p-/m-cresol (R = 1.89), 2,2-dimethylbutane/2-methylpentane (R = 1.51), 2,2,3-trimethylbutane /2,3-dimethyl pentane (R = 1.74) and 2,3-dimethylpentane/n-heptane (R = 1.92). In addition, it exhibited good column repeatability and reproducibility with the relative standard deviation (RSD) values of 0.02%-0.09% for run-to-run, 0.13%-0.22% for day-to-day and 2.7%-4.1% for column-to-column, resp., and a wide operational temperature range (30°C-280°C) . Its application to GC-MS anal. of the essential oil of Osmanthus fragrans has proven its good potential for practical anal. of complex samples.

Journal of Chromatography A published new progress about Alkanes Role: PUR (Purification or Recovery), PREP (Preparation). 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Recommanded Product: Methyl octanoate.

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

Yuan, Zhenbo published the artcilePalladium-Catalyzed Asymmetric Intramolecular Reductive Heck Desymmetrization of Cyclopentenes: Access to Chiral Bicyclo[3.2.1]octanes, Application of Benzyl acetate, the main research area is cyclopentenyl haloarylmethanone preparation palladium catalyst intramol reductive Heck desymmetrization; tetrahydromethanobenzoannulene carboxylate enantioselective preparation; Heck reaction; asymmetric catalysis; bicyclic compounds; desymmetrization; palladium.

A palladium-catalyzed asym. reductive Heck reaction of unactivated aliphatic alkenes, with eliminable β-hydrogen atoms, was realized for the first time. A series of optically active bicyclo[3.2.1]octanes bearing chiral quaternary and tertiary carbon stereocenters were obtained in good yields with excellent enantioselectivities, exhibited good functional-group tolerance and scalability. Moreover, deuterated optically active bicyclo[3.2.1]octanes were also obtained in high efficiency.

Angewandte Chemie, International Edition published new progress about Aromatic 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, Application of Benzyl acetate.

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