Esters-buliding-blocks

Chen, Huan published the artcileBurn Intensity Drives the Alteration of Phenolic Lignin to (Poly) Aromatic Hydrocarbons as Revealed by Pyrolysis Gas Chromatography-Mass Spectrometry (Py-GC/MS), Quality Control of 103-26-4, the publication is Environmental Science & Technology, database is CAplus and MEDLINE.

High-intensity wildfires alter the chem. composition of organic matter, which is expected to be distinctly different from low-intensity prescribed fires. Herein, we used pyrolysis gas chromatog./mass spectrometry (Py-GC/MS), in conjunction with solid-state ¹³C NMR and Fourier transform IR (FT-IR) spectroscopy, to assess chem. alterations from three wildfires and a long-term frequent prescribed fire site. Our results showed that black ash formed under moderate intensity burns contained less aromatic (ArH), polyaromatic hydrocarbon (PAH), and nitrogen-containing compounds (Ntg) but more lignin (LgC) and phenol compounds (PhC), compared to white ash formed under high intensity burns. Both ¹³C NMR and FT-IR confirmed a higher relative percentage of carboxyl carbon in white ash, indicating the potential for higher water solubility and more mobile carbon, relative to black ash. Compared to wildfires, ash from low-intensity prescribed fire contained less ArH, PAH, and Ntg and more LgC and PhC. Controlled laboratory burning trials indicated that organic matter alteration was sensitive to the burn temperature, but not related to the fuel type (pine vs. fir) nor oxygen absence/presence at high burn temperatures This study concludes that higher burn temperatures resulted in higher (poly)aromatic carbon/nitrogen and lower lignin/phenol compounds

Environmental Science & Technology published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Quality Control of 103-26-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xu, Kaijun published the artcileThe synthesis of asymmetric hydrogenation catalyst [Ru(BINAP)(OAc)₂] and its solid-supported studies, Category: esters-buliding-blocks, the publication is Huaxue Tongbao (2006), 69(11), 841-844, database is CAplus.

The two asym. hydrogenation catalysts, [Ru((S)-BINAP)(OAc)₂] and [Ru((R)-BINAP)(OAc)₂], have been synthesized under the optimal exptl. conditions. The asym. reduction of tiglic acid is efficiently achieved with 88% yield and 85% e.e. (enantiomeric excess) by using the synthesized catalyst. The study on the activity of catalyst [Ru(BINAP)(OAc)₂] supported on the meso porous mol. sieve SBA-15 showed that a relatively high yield (59%) and stereoselectivity (57% e.e.) were maintained after recycled for three times.

Huaxue Tongbao published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C8H7ClO3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Yang, Pan published the artcileExposure profiles and predictors of a cocktail of environmental chemicals in Chinese men of reproductive age, Product Details of C10H12O5, the publication is Chemosphere (2022), 134337, database is CAplus and MEDLINE.

Personal care products, such as additives, have raised widespread concerns about the potential threat to male reproductive health. The spermatogenesis in humans lasts for approx. 90 days, the average levels of these chems. remain unclear during spermatogenesis. In our study, we pooled urine samples from each man during the days of 1-15, 16-31, 32-63, and ≥64, and examined exposure to 48 typical additive chems. By principal component anal. (PCA), k-means clustering, and Spearman’s rank correlations, we then identified 6 PC scores and 4 clusters based on profiles of these chems. Some industrial, com. or structural similar chems. (e.g., phthalates) were significantly correlated compared to unrelated chems. (e.g., benzophenone). PCA scores were associated with individual lifestyles (e.g., household income, tea consumption, and drinking tap water). Distinct exposure components and exposure patterns of personal care products may help the reproductive health assessment of men. We suggested more concerns for widespread exposure to these chems. for men.

Chemosphere published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C3H6F3N, Product Details of C10H12O5.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Cao, Shi-Xuan published the artcileMagnetic nanoparticles supported cinchona alkaloids for asymmetric Michael addition reaction of 1,3-dicarbonyls and maleimides, Category: esters-buliding-blocks, the publication is Chinese Chemical Letters (2018), 29(1), 201-204, database is CAplus.

Magnetic nanoparticles Fe₃O₄@SiO₂ supported cinchona alkaloids (quinine and quinidine) were successfully synthesized as magnetically recoverable organocatalysts and characterized by FT-IR, XPS, SEM measurements, and elemental anal. Their catalytic activity and stereoselectivity were preliminarily evaluated in the asym. Michael addition reaction of 1,3-dicarbonyl compounds and maleimides to afford 3-(2-oxocyclopentyl)pyrrolidine-2,5-dione derivatives I [R = H, Me, Bn, etc.; R¹ = C(O)Me, CO₂Et, CO₂Me], 3-[3-acetyl-2-oxo-tetrahydrofuran-3-yl]-1-benzyl-pyrrolidine-2,5-dione and ethyl-2-[1-benzyl-2,5-dioxo-pyrrolidin-3-yl]-3-oxo-butanoate. The supported quinine catalyst exhibited good catalytic efficiency and modest to high enantioselectivity. The magnetic recoverability and recyclability of the catalyst were also examined

Chinese Chemical Letters published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C6H8O3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Li, Z. W. published the artcileAnalysis of volatile aroma compounds from five types of Fenghuang Dancong tea using headspace-solid phase microextraction combined with GC-MS and GC-olfactometry, Related Products of esters-buliding-blocks, the publication is International Food Research Journal (2021), 28(3), 612-626, database is CAplus.

The present work describes the relationship between volatile aroma components and flavors of Fenghuang Dancong tea. Volatile aroma components of five types of Fenghuang Dancong tea namely Baxian, Milanxiang, Yulanxiang, Guihuaxiang, and Yinhuaxiang were extracted by headspace solid-phase microextraction (HS-SPME), then analyzed by gas chromatog.- mass spectrometry (GC-MS) technique and gas chromatog. olfactometry (GC-O) techniques. The GC-MS results showed that a total of 116 volatile components were detected, among which 21 (including alcs., esters, olefins, aldehydes, ketones, and alkanes) were commonly detected in all types of tea. Based on GC-O anal., 26 active ingredients that mainly contribute to grassy, sweet, floral, fruity, woody, and honey aromas were detected. Among these ingredients, four compounds including linalool oxide I, linalool, nerol, and neroli, which give floral, sweet, and honey aromas were abundant (with high aroma intensity) in all five types of tea. This suggests that these compounds are the main components contributing to the unique aroma of Fenghuang Dancong tea.

International Food Research Journal published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C6H8O3, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Sun, Bingyan published the artcileFully cross-linked UV-induced peelable acrylic PSA prepared from a dual curable castor oil based urethane acrylate oligomer for wafer dicing, Category: esters-buliding-blocks, the publication is Progress in Organic Coatings (2022), 106680, database is CAplus.

For UV-induced peelable PSA used in the wafer dicing process, improving the peel performance can effectively increase the process reliability and the yield of subsequent packaging process. In this work, a NCO-containing castor oil-based urethane acrylate oligomer called CO-PUB with dual curable functions (UV-induced polymerization and NCO/OH reaction) was obtained by partially sealing a castor oil-based urethane oligomer with hydroxyethyl acrylate. Fourier transform IR spectroscopy (FTIR) and NMR spectrometer (NMR) results indicated that CO-PUB was successfully prepared CO-PUB, OH-containing acrylic copolymer, multifunctional acrylate monomer and photo-initiator were used to construct a UV-induced peelable adhesive for silicon wafer dicing. The results showed that NCO groups in CO-PUB underwent the NCO/OH reaction with the acrylic copolymer to obtain a vinyl pendant cross-linked acrylic copolymer. The peel strength of this peelable adhesive before UV irradiation could exceed 20 N/25 mm. After UV irradiation, the unsaturated vinyl bonds contained in it were copolymerized with the multifunctional acrylate monomer to form a fully cross-linked adhesive film and the peel strength could be reduced to below 1 N/25 mm. Compared with UV-induced peelable adhesives prepared by other reported curing agents, the adhesive prepared from CO-PUB reduced UV dose required for curing. The crosslinking degree of cured adhesive film was also increased and the gel content was up to 95%. The residual adhesive after peeling off could be reduced to about 0.32%. In addition, CO-PUB used renewable castor oil as polyol and did not need to add any organic solvent during the preparation process, providing a new idea for the green preparation of UV-induced peelable adhesive with excellent performances.

Progress in Organic Coatings published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C3H8N2S, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Weichao published the artcileDetermining Roles of Cu⁰ in the Chemosynthesis of Diols via Condensed Diester Hydrogenation on Cu/SiO₂ Catalyst, Category: esters-buliding-blocks, the publication is ChemCatChem (2020), 12(15), 3849-3852, database is CAplus.

Copper-based catalyst was applied in the condensed diester hydrogenation with unexpected high selectivity (∼100%) to 1,6-hexanediol. On basis of the mass transfer anal. and kinetics results, the reaction rate of the condensed diester hydrogenation was deduced to be controlled by the activation of hydrogen on Cu⁰ sites, which was further demonstrated by the correlations between the catalytic activity and different copper species. Importantly, this catalysis mechanism is different with that of gas-phase diester hydrogenation, which is generally determined by the adsorption of ester on Cu⁺ species.

ChemCatChem published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H7ClO3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Liu, Chang-ling published the artcilePreparation of photoresponse azobenzene polymer by ATRP, Synthetic Route of 135529-02-1, the publication is Yinran Zhuji (2016), 33(8), 22-24, database is CAplus.

Azobenzene polymers have photoresponsive property and get very good application in fields of information storage, photonics, mol. switch etc. The azobenzene star polymer with three-arm was prepared by atom transfer radical polymerization (ATRP), using the trimethyolpropane as initiator, and azobenzene as monomer. The structure of polymers were characterized by IR spectroscopy (FTIR), hydrogen NMR spectrometer (¹H-NMR), howing the target product was successfully synthesized. The mol. weight and the mol. weight distribution of the polymer was measured by gel permeation chromatograph (GPC), and the synthesized polymer agreed with the “reactive-controllable” characteristics. The result of UV spectrophotometer absorption of polyazobenzene showed the configuration inversion under light radiation.

Yinran Zhuji published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Synthetic Route of 135529-02-1.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhu, Yasheng published the artcileEnantioselective Construction of Single and Vicinal All-Carbon Quaternary Stereocenters through Ion Pair Catalyzed 1,6-Conjugate Addition, Formula: C6H8O3, the publication is Organic Letters (2021), 23(18), 7248-7253, database is CAplus and MEDLINE.

An asym. 1,6-conjugate addition to presynthesized δ-aryl-δ-cyano disubstituted para-quinone methides I (R = H, 3-Me, 3-bromo; Ar = Ph, 4-methylphenyl, 2-naphthyl, etc.) through bifunctional phosphonium-amide promoted ion pair catalysis for acyclic all-carbon quaternary stereocenter construction has been described. Both acyclic and cyclic 1,3-dicarbonyls CH₂(C(O)OR¹)₂ (R¹ = Ph, 2-methylphenyl, benzyl, etc.)/II (R² = Me, Et, Bu, allyl) participate in asym. alkylation reaction, furnishing a wide array of diarylmethanes bearing a single acyclic or vicinal cyclic and acyclic quaternary carbon stereocenters III/IV in high efficiency with excellent stereoselectivity. Computational studies elucidate the origin of enantioselectivity.

Organic Letters published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C38H74Cl2N2O4, Formula: C6H8O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Xinchao published the artcileNative carboxyl group-assisted C-H acetoxylation of hydrocinnamic and phenylacetic acids, Recommanded Product: Methyl 3-phenyl-2-propenoate, the publication is Chemical Communications (Cambridge, United Kingdom) (2022), 58(32), 4993-4996, database is CAplus and MEDLINE.

A method of native carboxyl-assisted, Pd(II)-catalyzed ortho-C-H acetoxylation of both hydrocinnamic and phenylacetic acids 2-R-3-R¹-4-R²C₆H₂CH(R³)CH₂C(O)OH (R = H, Me, Cl, OCF₃, etc.; R¹ = Me, Br, CF₃, etc.; R² = Me, F, COOMe, etc.; R³ = H, Me, Et)/2-R⁴-3-R⁵-4-R⁶-5-R⁷C₆HC(R⁸)(R⁹)C(O)OH (R⁴ = H, Me, I, etc.; R⁵ = H, OMe, CF₃, etc.; R⁶ = F, OMe, COOMe, etc.; R⁷ = R⁸ = R⁸ = H, Me) that can be found in many biol. active mols. as the key moieties was reported. Based on the broad scope and the application potential showcased with drug mols., such as (ibuprofen, ketoprofen, and flurbiprofen) it is anticipated that this C-H acetoxylation reaction will find attractive applicability in future synthetic endeavors.

Chemical Communications (Cambridge, United Kingdom) published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C20H40O2, Recommanded Product: Methyl 3-phenyl-2-propenoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics