Esters-buliding-blocks

Liu, Shaohui published the artcileDesign of photoinitiating systems based on the chalcone-anthracene scaffold for LED cationic photopolymerization and application in 3D printing, Quality Control of 10287-53-3, the publication is European Polymer Journal (2021), 110300, database is CAplus.

In this study, light-emitting diodes (LEDs) used as secure, low-cost and possessing long emission wavelengths irradiation sources were applied in photopolymerization Seven novel anthracene derivatives were proposed and evaluated in photosensitive systems. Three of them were never synthesized before and the other derivatives were evaluated in other fields. Due to the in-silico design of mol. structure by mol. modeling, the proposed chalcone-anthracenes showed a broad absorption band in the visible region with favorable molar extinction coefficients Photoinitiation abilities of the different photoinitiating systems were examined by the Real-Time Fourier Transformed IR Spectroscopy. The free radical polymerization of acrylates under LED@405 nm irradiation in laminate was evaluated and high final function conversions (FCs) were obtained in the presence of three-component photoinitiating systems based on chalcone-anthracenes/iodonium salt/amine. Meanwhile, the chalcone-anthracene derivatives exhibited high photoinitiation abilities in cationic photopolymerization of epoxides in combination with an iodonium salt under LED@405 nm irradiation The final function conversions of epoxy using some anthracene/iodonium salt systems were even higher than the well-established dibutoxyanthracene (DBA)/iodonium salt benchmark system. In addition, due to the good light absorption properties, the cationic photopolymerization also was carried out in the presence of the chalcone-anthracene/iodonium salt systems under LED@470 nm or laser diode@447 nm irradiation (not possible to do with the reference DBA systems). Markedly, these derivatives were also able to sensitize sulfonium salts. The photochem. reactivity of anthracene derivatives was investigated through the steady state photolysis and fluorescence quenching experiments Furthermore, the proposed interaction mechanisms of chalcone-anthracene derivatives and additives (iodonium salt and amine) were discussed using the free energy changes of electron transfer reactions. Interestingly, the cationic photopolymerization of A5/iodonium salt system was applied in 3D printing and the 3D patterns showed a good spatial resolution

European Polymer Journal published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Quality Control of 10287-53-3.

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

Chen, Hong published the artcileRhenium(I) N-Heterocyclic Carbene Complexes in Photoinitiating Systems for Polymerization upon Visible Light: Development of Photosensitive Resins for 3D and 4D Applications, Computed Properties of 10287-53-3, the publication is ACS Applied Polymer Materials (2021), 3(1), 464-473, database is CAplus.

Two fac-rhenium tris-carbonyl complexes bearing a π-accepting pyridoannelated N-heterocyclic carbene (NHC) ligand with general formula Re(CO)₃(pyipy)X, where pyipy is 2-pyridil-imidazo[1,5-a]pyridine-3-ylidene and X = Cl (Re1) and Br (Re2), are investigated as photoredox catalytic systems in light-promoted polymerization reactions. Both rhenium(I) complexes are able to efficiently generate radicals to initiate free radical polymerization Remarkably, excellent radical polymerization profiles and final conversions are obtained under soft irradiations (LED lamp, λ_exc = 405 nm) by using the proposed complexes with iodonium salt and amine as photoinitiating systems (PISs) for polyethyleneglycol (PEG)-acrylate monomers. The involved mechanism is investigated by means of different spectroscopic techniques and further supported by electrochem. data. In addition, using the prepared three-component PISs, outstanding 3D patterns with spatial resolution could be obtained through direct laser write experiments Remarkably, the resulting material displays reversible deformation that can be controlled with heating-hydration cycles due to stimuli-responsiveness of PEG chains of the polymeric network, thus opening the way for innovative smart and stimuli-responsive 4D-printed materials and soft actuators.

ACS Applied Polymer Materials published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Computed Properties of 10287-53-3.

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

Wang, Xu-ling published the artcileRobust and Reactive Neutral Nickel Catalysts for Ethylene Polymerization and Copolymerization with a Challenging 1,1-Disubstituted Difunctional Polar Monomer, Recommanded Product: Dimethyl itaconate, the publication is ACS Catalysis (2021), 11(5), 2902-2911, database is CAplus.

A series of Me nickel complexes with phosphino-naphtholate chelate ligands have been strategically designed, synthesized, and fully characterized. These catalysts showed extremely high activity toward ethylene polymerization and ethylene/unsaturated acid ester copolymerization without any activator under mild conditions. The catalytic activity for ethylene polymerization was up to 3.0 × 10⁷ g_PE mol_Ni^-1 h^-1, which was the topmost among the neutral nickel catalysts previously reported. Besides, the catalytic activity for ethylene/methyl acrylate (MA) copolymerization was also outstanding (up to 3.7 × 10⁵ g mol_Ni^-1 h^-1) among the representative Ni and Pd catalytic systems, which could mediate E/MA copolymerization More remarkably, a very challenging 1,1-disubstituted difunctional ethylene comonomer, di-Me itaconate, was copolymerized with ethylene by these catalysts to give end-difunctional polyethylene with double ester groups and mol. weight up to 10 700 directly.

ACS Catalysis published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C5H5NO3S, Recommanded Product: Dimethyl itaconate.

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

Dou, Zhansi published the artcileOne-step preparation of lignin-based solid acid by carbonization and sulfonation to catalyze the synthesis of dimethyl adipate, COA of Formula: C8H14O4, the publication is Industrial Crops and Products (2022), 114721, database is CAplus.

Lignin is a high-quality precursor of carbon materials, rich in content and low in price. Sodium lignosulfonate was used as a raw material to prepare a high-efficiency catalyst for the esterification of adipic acid and methanol to synthesize di-Me adipate by a one-step carbonization sulfonation process. The catalyst synthesized by this method has high sulfonic acid groups, and the catalytic process does not need to use sulfuric acid and other advantages. Through characterization anal., study the relationship between the structure of the catalyst and the catalytic performance. A preliminary study on the industrial application of the catalyst has been done. The optimal reaction conditions were reached when the catalyst dosage is 20% of the mass of adipic acid, the alkyd ratio is 8:1, the stirring speed is 600r/min, the reaction temperature is 346 K, and the reaction time is 120 min.

Industrial Crops and Products 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 C8H14O4, COA of Formula: C8H14O4.

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

Qi, Yujie published the artcileHigh-efficient lignin-based polymerizable macromolecular photoinitiator with UV-blocking property for visible light polymerization, SDS of cas: 15625-89-5, the publication is International Journal of Biological Macromolecules (2022), 234-244, database is CAplus and MEDLINE.

Developing high-efficient visible light macromol. photoinitiator (macro PI) with excellent initiation performance, low migration, high biosafety and multi-function is beneficial to broaden the application of photopolymer. Lignin contains chromophores which could generate free radicals under light irradiation In this study, a lignin-based polymerizable macro PI (DAL-11ene-amine) was designed and synthesized through covalent grafting 10-undecenoyl chloride (11ene) and hydrogen donor 4-(dimethylaminobenzoic acid) Et ester (EDAB) into dealkaline lignin (DAL) skeleton. The structure of DAL-11ene-amine was characterized by UV-vis, FTIR, ¹H NMR, GPC, and ³¹P NMR spectra. Under the irradiation of a 405 nm LED, DAL-11ene-amine can directly produce active species and initiate the polymerization of acrylate monomers or thiol-ene click reaction. The photoinitiation efficiency of DAL-11ene-amine is higher than that of DAL-11ene or the two-component combination of DAL-11ene and EDAB. Using DAL-11ene-amine as PI, the prepared polymer films exhibit excellent UV-blocking property. With only 0.5 weight% addition of DAL-11ene-amine, nearly 100% of UVB + UVC and the most of UVA can be blocked by the films. Moreover, DAL-11ene-amine exhibits higher migration stability and biosafety because it can be covalently linked into polymer crosslinking networks. The results indicate that DAL-11ene-amine has great application potentials in preparing environmentally friendly UV-blocking films and biosafety coatings.

International Journal of Biological Macromolecules 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 C15H20O6, SDS of cas: 15625-89-5.

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

Qi, Yujie published the artcileHigh-efficient lignin-based polymerizable macromolecular photoinitiator with UV-blocking property for visible light polymerization, Safety of Ethyl 4-dimethylaminobenzoate, the publication is International Journal of Biological Macromolecules (2022), 234-244, database is CAplus and MEDLINE.

Developing high-efficient visible light macromol. photoinitiator (macro PI) with excellent initiation performance, low migration, high biosafety and multi-function is beneficial to broaden the application of photopolymer. Lignin contains chromophores which could generate free radicals under light irradiation In this study, a lignin-based polymerizable macro PI (DAL-11ene-amine) was designed and synthesized through covalent grafting 10-undecenoyl chloride (11ene) and hydrogen donor 4-(dimethylaminobenzoic acid) Et ester (EDAB) into dealkaline lignin (DAL) skeleton. The structure of DAL-11ene-amine was characterized by UV-vis, FTIR, ¹H NMR, GPC, and ³¹P NMR spectra. Under the irradiation of a 405 nm LED, DAL-11ene-amine can directly produce active species and initiate the polymerization of acrylate monomers or thiol-ene click reaction. The photoinitiation efficiency of DAL-11ene-amine is higher than that of DAL-11ene or the two-component combination of DAL-11ene and EDAB. Using DAL-11ene-amine as PI, the prepared polymer films exhibit excellent UV-blocking property. With only 0.5 weight% addition of DAL-11ene-amine, nearly 100% of UVB + UVC and the most of UVA can be blocked by the films. Moreover, DAL-11ene-amine exhibits higher migration stability and biosafety because it can be covalently linked into polymer crosslinking networks. The results indicate that DAL-11ene-amine has great application potentials in preparing environmentally friendly UV-blocking films and biosafety coatings.

International Journal of Biological Macromolecules published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Safety of Ethyl 4-dimethylaminobenzoate.

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

Li, Juan published the artcileDetermination of 21 photoinitiators in human plasma by using high-performance liquid chromatography coupled with tandem mass spectrometry: A systemically validation and application in healthy volunteers, Synthetic Route of 10287-53-3, the publication is Journal of Chromatography A (2021), 462079, database is CAplus and MEDLINE.

In the present study, a comprehensive and sensitive method for simultaneous determination of 21 PIs (nine benzophenones, eight amine co-initiators, and four thioxanthones) in human plasma using high-performance liquid chromatog. coupled with tandem mass spectrometry was developed and validated. Two different pre-treatment approaches (liquid-liquid extraction (LLE) and LLE coupled with solid-phase extraction (SPE)) and eight extraction solvents were studied to optimize sample treatment to obtain good recoveries and reduce any matrix effects. The procedure of LLE+SPE was selected as final sample treatment procedure because it obtained higher recoveries as well as lower matrix effects than that performed by LLE alone. The recoveries of 21 target analytes at three spiked concentrations (0.05, 0.5, and 5 ng/mL) ranged from 81% to 109%. The intra- and inter-day relative standard deviations were between 2.5% and 13%. Accuracy and precision data indicated that the detection method was accurate and precise for most of the PIs. The linearities of the labeled dilution calibration curves at 10 concentration levels (iLOQ to 100 ng/mL or iLOQ to 200 ng/mL) were good with correlation coefficients ranged from 0.995 to 0.999. The method quantification limits were in the range of 1.7-16 pg/mL. The anal. method was applied to the anal. of PIs in 14 human plasma samples collected from pregnant women in Guangdong Province, China. Fifteen PIs were detected with total concentrations ranging from 318 to 2772 pg/mL. The ubiquitous contamination of human plasma with PIs suggests that there is widespread exposure to these compounds Consequently, there should be increased awareness of these pollutants in the environment.

Journal of Chromatography A published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Synthetic Route of 10287-53-3.

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

Qin, Wei published the artcileFailure mechanism of zinc adipate as a β-nucleating agent for polypropylene in the presence of calcium stearate, Safety of Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Polymer (2021), 123374, database is CAplus.

Although zinc dicarboxylic acids are highly effective β-nucleating agents (β-NAs), they lose their β-nucleating ability in isotactic polypropylene (iPP) upon the addition of calcium stearate (CaStr₂). In this study, we investigated the failure mechanism of these β-NAs in terms of the chem. and phys. interactions of zinc adipate (ZnAA) with CaStr₂. No chem. reaction occurs between CaStr₂ and ZnAA; rather, it is the phys. interactions between this β-NA and CaStr₂ that are responsible for the loss of β-nucleating ability. Based on the exptl. findings and mol. dynamics (MD) simulations, we suggest a blocking effect of CaStr₂ on nucleation as a possible failure mechanism. MD simulations confirmed that the aggregation of CaStr₂ on the β-NA surface, observed exptl. using polarized optical microscopy and SEM, resulted from the binding energy for the interaction between ZnAA and CaStr₂ being higher than that for iPP/CaStr₂. Because the active nucleation sites on the surface of the β-NA were covered, lattice matching between ZnAA and the iPP chains was hindered. Therefore, the addition of CaStr₂ weakens the β-nucleating ability of ZnAA, leading to inhibition of the epitaxial crystallization process, thereby decreasing the degree of β-crystal formation and, consequently, lowering the toughness of the resulting iPP.

Polymer published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Safety of Tris(2,4-di-tert-butylphenyl) phosphite.

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

Yang, Su published the artcileDimethyl itaconate inhibits LPS-induced microglia inflammation and inflammasome-mediated pyroptosis via inducing autophagy and regulating the Nrf-2/HO-1 signaling pathway, Recommanded Product: Dimethyl itaconate, the publication is Molecular Medicine Reports (2021), 24(3), 672, database is CAplus and MEDLINE.

The endogenous metabolite itaconate and its cell-permeable derivative di-Me itaconate (DI) have been identified as anti-inflammatory regulators of macrophages; however, their contribution to inflammasome-mediated pyroptosis remains unknown. The present study examined the mol. mechanism of DI on NLR family pyrin domain-containing 3 (NLRP3) inflammasome assembly and NLRP3 inflammasome-dependent pyroptosis in microglia. Lipopolysaccharide (LPS) and ATP were used to induce microglia pyroptosis in vitro; this process was confirmed by TUNEL assay, lactate dehydrogenase (LDH) detection and gasdermin D (GSDMD) expression anal. The regulation of microglia polarization and inflammatory cytokine expression was assessed by immunofluorescence assays and ELISA. To investigate the associated mechanism of action, the expression levels of the nuclear factor erythroid 2-related factor 2 (Nrf-2)/heme oxygenase-1 (HO-1) pathway proteins were analyzed by western blotting. Finally, the regulatory effect of DI on autophagy and its association with inflammation was determined by western blotting. The present study demonstrated that DI administration inhibited NLRP3 assembly, LDH release and GSDMD cleavage. Cotreatment of DI with LPS and ATP facilitated the transition from M1 to M2, reduced inflammatory mediator expression and impeded NF-κB phosphorylation. In addition, DI effectively reduced reactive oxygen species production through the Nrf-2/HO-1 pathway. Moreover, DI induced cellular autophagy, whereas inhibition of autophagy with 3-methyladenine markedly reversed its inhibitory effect on NLRP3-dependent pyroptosis. Taken together, the present study suggested that DI participated in the Nrf-2/HO-1 pathway and served a key role in microglia inflammation and NLRP3 inflammasome-mediated pyroptosis via induction of autophagy.

Molecular Medicine Reports published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C23H28N2O4, Recommanded Product: Dimethyl itaconate.

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

Gong, Xinying published the artcileOrganophosphite antioxidants in mulch films are important sources of organophosphate pollutants in farmlands, Synthetic Route of 31570-04-4, the publication is Environmental Science & Technology (2021), 55(11), 7398-7406, database is CAplus and MEDLINE.

Organophosphite antioxidants (OPAs) are important auxiliary antioxidants used in plastic polymers and can be oxidized to organophosphate esters (OPEs) during production and processing. In this work, the occurrence of OPAs and OPEs in farmlands with or without mulch film applications was investigated. Six OPAs and five OPEs were detected, with the median concentrations of 2.66 ng/g (∑₆OPAs) and 100 ng/g (∑₅OPEs) in the film-mulching soil and 1.16 ng/g (∑₆OPAs) and 47.9 ng/g (∑₅OPEs) in the nonfilm-mulching soil, resp. The oxidative derivative of AO168 (tris (2,4-di-tert-butylphenyl) phosphite), a typical OPA, AO168=O (tris (2,4-di-tert-butylphenyl) phosphate) was frequently detected in farmlands at the concentrations of 0-731 ng/g, which is much higher than that of the com. OPEs (0-12.1 ng/g). This suggests that the oxidation derivatives of OPAs (OPAs=O) might be important OPE contaminants in soils. Mulch films could be their important source. According to the simulation migration experiment, the emission risk ranges of AO168 and AO168=O from mulch films to soils in China were estimated to be 3.96-87.6 and 10.5-95.3 tons/yr, resp., which were much higher than those of OPEs from sewage sludge applications. Simulation experiments also demonstrated that oxidation was the major pathway for OPAs in soils. OPAs with small substituent groups could be potential sources for organophosphate diesters. For the first time, the serious pollution of OPAs and OPAs=O in soils has been reported, and mulch films have been identified as their potential source.

Environmental Science & Technology published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Synthetic Route of 31570-04-4.

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