Month: November 2022

Matcha, Kiran published the artcileHeck Reaction of 2-Oxyacrylates with Aryl Bromides: A Common Route to Monoaryl Pyruvates and Ortho Ester-Protected Monoaryl Pyruvates, Related Products of esters-buliding-blocks, the publication is Journal of Organic Chemistry (2022), 87(16), 10736-10746, database is CAplus and MEDLINE.

A palladium-catalyzed Heck reaction between 2-oxyacrylates and aryl bromides was developed, where DavePhos was a unique ligand that efficiently promoted the reaction. The products, 2-oxycinnamates I [R¹ = 4-MeC₆H₄, 4-FC₆H₄, 4-F₃CC₆H₄, etc.; R² = OMe, CH₂CO₂Me, NHAc, OAc, Opiv, OCOPh], served as excellent precursors, provided synthetically useful monoaryl pyruvates or ortho ester-protected monoaryl pyruvates depending on the nature of the 2-oxy group. The formation of such ortho esters via alkoxide addition was novel, and computational studies identified a plausible mechanism with an oxyallyl zwitterion as the key intermediate.

Journal of Organic Chemistry 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 C7H10O4, Related Products of esters-buliding-blocks.

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

Yang, Tonghui published the artcileEnhanced crosslinking of polypropylene in γ-irradiation via copper(II) doping, Quality Control of 15625-89-5, the publication is Radiation Physics and Chemistry (2022), 110042, database is CAplus.

Crosslinked polypropylene (PP) has a greater application prospect due to its excellent properties, hence, how to improve the crosslinking of PP is significant. In our research, the effects of γ-irradiation on the crosslinking of PP blended with copper(II) acetate monohydrate were investigated. Firstly, PP was melt-blended with a crosslinking agent (1,2-Polybutadiene (PB) or Trimethylolpropane triacrylate (TMPTA)) and copper(II) acetate monohydrate in a twin-screw extruder, then treated with various γ-irradiation dose. The influence of copper(II) content and radiation dose on crosslinking of PP was characterized by gel content, melt flow index measurement (MFI), rheol. anal. measurement, differential scanning calorimetry, and thermogravimetric anal. The results of gel content, MFI, and Rheol. anal. indicated that the copper(II) could enhance the crosslinking of both PP/PB and PP/TMPTA at all ranges of radiation dose, more particularly, the enhanced effect was much prominent at low radiation dose, and of which is more obvious in the latter system. The crosslinking effect based on the mechanism of copper(II) catalysis enhanced was also discussed, which is assumed as the promotion of free radical production during irradiation processing. In addition, the copper(II) would also enhance the thermal stability of the γ-irradiation treated PP/PB and PP/TMPTA blends, and decrease the crystallinity and the m.p. This paper provided a novel method to increase the irradiated crosslinking of PP at a lower irradiation dose, which was expected to expand its application field.

Radiation Physics and Chemistry 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 C39H35N5O8, Quality Control of 15625-89-5.

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

Lin, Hsi-Hsin published the artcileSelective Ammonolysis of Bioderived Esters for Biobased Amide Synthesis, Product Details of C8H14O4, the publication is ACS Omega (2021), 6(44), 30040-30049, database is CAplus and MEDLINE.

Amidation is an important reaction for bioderived platform mols., which can be upgraded for use in applications such as polymers. However, fundamental understanding of the reaction especially in the presence of multiple groups is still lacking. In this study, the amidation of di-Me fumarate, maleate, and succinate through ester ammonolysis was examined The reaction networks and significant side reactions, such as conjugate addition and ring closing, were determined A preliminary kinetic comparison among addnl. C₄ and C₆ esters showed a significant correlation between mol. structure and ammonolysis reactivity. Esters with a C=C double bond in the mol. backbone were found to have higher ammonolysis reactivity. To improve the selectivity to unsaturated amides rather than byproducts, the effects of thermal conditions and additives in di-Me fumarate ammonolysis were examined Lower temperature and decreasing methoxide ion concentration in the solution relative to the base case conditions increased the fumaramide selectivity from 67.1 to 90.6%.

ACS Omega 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, Product Details of C8H14O4.

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

Miao, Tengfei published the artcileInduction, fixation and recovery of self-organized helical superstructures in achiral liquid crystalline polymer, Related Products of esters-buliding-blocks, the publication is Polymer Chemistry (2021), 12(41), 5931-5936, database is CAplus.

The fixation, storage and self-recovery of chiral information in superstructures constructed by weak noncovalent bonds remain a big challenge in nature. Here, we describe a novel self-assembled system where the mol. chirality can be transferred and further stored into a helical superstructure. Based on achiral liquid crystalline polymers (LCPs), the twist between azobenzene (Azo) units in polymer side chains can be switched by the configuration or alkyl chain length of the introduced chiral dopant. Furthermore, the crosslinking strategy of polymer side chains was adopted to allow permanent memory of the induced helical superstructure after complete removal of the chiral dopant. Although the helical superstructure was temporarily destroyed by UV light irradiation, the stored chiral information enabled self-recovery of the previous helical chirality, without the need for any pre-existing chiral source. The chiral switching in the absence of chiral source is unprecedented and opens a new window for the design and application of chiral materials.

Polymer Chemistry 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, Related Products of esters-buliding-blocks.

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

Pawale, Tejal published the artcileSynergistic self-assembly of rod-like monomers in blue phase liquid crystals for tunable optical properties, SDS of cas: 15625-89-5, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, database is CAplus.

The three-dimensional nanostructures of blue phase liquid crystals (BPLCs) are becoming the spotlight of soft matter research in electro-optic devices, sensors, photonic crystals, and 3D lasers. The polymerization of the blue phase system overcomes the inherent thermal instability and paves the way for broadening the application of blue phases. Prior to polymerization, a fundamental understanding of the synergistic self-assembly behavior of monomers in the BP lattice can provide insights not only into the soft crystal growth and crystal transformations but also into the tunability of their optical properties. Here, we controlled the reactive monomer content in the BPs to observe the stability of BPI and BPII with different lattice dimensions before polymerization The self-assembly behavior of com. available rod-like mesogenic monomers in BP lattices with different monomer compositions was investigated under a homogeneous hybrid cell and directed self-assembly approach. The revealed synergistic self-assembly mechanism of the mesogenic monomer in BPs provides the ability to tune the photonic band gap of BP soft crystals.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 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

Jiang, Zhujun published the artcileThree dimensional printing of porous scaffolds BaTiO₃ piezoelectric ceramics and regulation of their mechanical and electrical properties, Application In Synthesis of 10287-53-3, the publication is Ceramics International (2022), 48(5), 6477-6487, database is CAplus.

A series of porous scaffolds of piezoelec. ceramic barium titanate (BaTiO₃) were successfully fabricated by Digital Light Processing (DLP) 3D printing technol. in this work. To obtain a high-precision and high-purity sample, the debinding sintering profile was explored and the optimal parameters were determined as 1425°C for 2h. With the increase of scaffolds porosity from 10% to 90%, the compressive strength and piezoelec. coefficient (d₃₃) decreased gradually. The empirical formulas about the mech. and piezoelec. properties were obtained by adjusting BaTiO3 ceramics with different porosity. In addition, the distribution of potential and stress under 100 MPa pressure were studied by the finite element method (FEM).

Ceramics International 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, Application In Synthesis of 10287-53-3.

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

Li, Zhan-Ku published the artcilePretreatment of sweet sorghum stalk with aqueous hydrogen peroxide for enhancing methanolysis and property of the bio-oil, Recommanded Product: Methyl 3-oxovalerate, the publication is Renewable Energy (2021), 1127-1136, database is CAplus.

Alcoholysis is a promising approach for converting biomass into fuels and/or chems. under mild conditions. However, the effect of pretreatment on biomass alcoholysis was rarely reported. Herein, the effect of pretreatment with H₂O₂ on sweet sorghum stalk (SSS) methanolysis was examined The results show that the pretreatment could markedly improve the bio-oil (BO) yield and decrease the appropriate temperature for obtaining maximum BO yield. The appropriate temperature for pretreated SSS methanolysis was determined to be 280 °C and the maximum BO yield is 44 wt%. In addition, higher heating values of the BOs were also enhanced based on elemental anal. According to anal. with gas chromatograph/mass spectrometer, phenolic compounds, esters, and sugars are predominant in the BOs, and the yield of phenolic compounds significantly increased from 91.75 to 111.68 mg·g^-1 by the pretreatment. Moreover, polar species in the BOs decreased and deoxygenation occurred during pretreated SSS methanolysis. Analyses with scanning electron microscope and N₂ physisorption reveal that pretreated SSS has more grooves and higher sp. surface area and anomalous porosity than SSS. According to analyses with Fourier transform IR spectrometer and X-ray photoelectron spectrometer, oxygen functional groups mainly in the forms of C=O and COO were introduced into SSS by the pretreatment. The changes of phys. and chem. structures should be responsible for enhancing SSS methanolysis and property of the BO.

Renewable Energy published new progress about 30414-53-0. 30414-53-0 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ketone,Ester, name is Methyl 3-oxovalerate, and the molecular formula is C6H10O3, Recommanded Product: Methyl 3-oxovalerate.

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

Li, Penghao published the artcileAssembly of a Porous Supramolecular Polyknot from Rigid Trigonal Prismatic Building Blocks, COA of Formula: C22H23BO4, the publication is Journal of the American Chemical Society (2019), 141(33), 12998-13002, database is CAplus and MEDLINE.

Herein we report a hydrogen-bonded three-dimensional porous supramol. polyknot assembled from a rigid trigonal prismatic triptycene building block with six extended peripheral aryl-carboxyl groups. Within this superstructure, three arrays of undulated 2D rhombic subnets, which display an inclined polycatenation, are interconnected to give an unprecedented uninodal six-connected net with a point symbol of (3.4⁴.6¹⁰). Such an entanglement results in a trefoil knot motif, which, as the basic repeating unit, is fused and interlocked with itself three-dimensionally to afford a supramol. polyknot. This example highlights the ability of supramol. systems to form topol. complex architectures using geometrically simple building blocks.

Journal of the American Chemical Society published new progress about 1448637-05-5. 1448637-05-5 belongs to esters-buliding-blocks, auxiliary class Alkynyl,Boronic acid and ester,Benzene,Ester,Boronate Esters,Boronic Acids,Boronic acid and ester,, name is Methyl 4-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethynyl)benzoate, and the molecular formula is C22H23BO4, COA of Formula: C22H23BO4.

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

Chen, Ke-Wei published the artcileOrganocatalytic Atroposelective Synthesis of N-N Axially Chiral Indoles and Pyrroles by De Novo Ring Formation, HPLC of Formula: 30414-53-0, the publication is Angewandte Chemie, International Edition (2022), 61(17), e202116829, database is CAplus and MEDLINE.

The first highly atroposelective construction of N-N axially chiral indole scaffolds I [R = H, 4-F, 6-MeO, 7-Br, etc.; R¹ = H, Me; R² = CO₂Me, CO₂Et, Ph, etc.; R³ = Me, Et, i-Pr, Bn; R⁴ = Ph, 2-FC₆H₄, 3-FC₆H₄, etc.] was established via a new strategy of de novo ring formation. This strategy made use of the organocatalytic asym. Paal-Knorr reaction of well-designed N-aminoindoles with 1,4-diketones, thus affording N-pyrrolylindoles in high yields and with excellent atroposelectivities (up to 98% yield, 96% ee). In addition, this strategy was applicable for the atroposelective synthesis of N-N axially chiral bispyrroles II [R⁵ = Ph, 3-ClC₆H₄, 3-MeOC₆H₄, 1-naphthyl, 2-naphthyl; R⁶ = Me, Et, Bn; R⁷ = Me, Et, i-Pr; R⁸ = Ph, 2-FC₆H₄, 3-thienyl, etc.; R⁹ = Me, Et, i-Pr, Bn] (up to 98% yield, 97% ee). More importantly, such N-N axially chiral heterocycles could be converted into chiral organocatalysts with applications in asym. catalysis, and some mols. display potent anticancer activity. This work not only provided a new strategy for the atroposelective synthesis of N-N axially chiral mols. but also offers new members of the N-N atropisomer family with promising applications in synthetic and medicinal chem.

Angewandte Chemie, International Edition published new progress about 30414-53-0. 30414-53-0 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ketone,Ester, name is Methyl 3-oxovalerate, and the molecular formula is C6H10O3, HPLC of Formula: 30414-53-0.

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

Huang, Zhujun published the artcileMetal-Free Hydrosilylation Polymerization by Merging Photoredox and Hydrogen Atom Transfer Catalysis, Formula: C5H10O2S, the publication is Journal of the American Chemical Society (2021), 143(45), 19167-19177, database is CAplus and MEDLINE.

Organosilicon compounds and polymers have found wide applications as synthetic building blocks and functional materials. Hydrosilylation is a common strategy toward the synthesis of organosilicon compounds and polymers. Although transition-metal-catalyzed hydrosilylation has achieved great advances, the metal-free hydrosilylation polymerization of dienes and bis(silane)s, especially the one suitable for both electron-rich and electron-deficient dienes, is largely lacking. Herein, the authors report a visible-light-driven metal-free hydrosilylation polymerization of both electron-rich and electron-deficient dienes with bis(silane)s by using the organic photocatalyst and hydrogen atom transfer (HAT) catalyst. The authors achieved the well-controlled step-growth hydrosilylation polymerizations of the electron-rich diene and bis(silane) monomer due to the selective activation of Si-H bonds by the organic photocatalyst (4CzIPN) and the thiol polarity reversal reagent (HAT 1). For the electron-deficient dienes, hydrosilylation polymerization and self-polymerization occurred simultaneously in the presence of 4CzIPN and aceclidine (HAT 2), providing the opportunity to produce linear, hyperbranched, and network polymers by rationally tuning the concentration of electron-deficient dienes and the ratio of bis(silane)s and dienes to alter the proportion of the two polymerizations A wide scope of bis(silane)s and dienes furnished polycarbosilanes with high mol. weight, excellent thermal stability, and tunable architectures.

Journal of the American Chemical Society published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Formula: C5H10O2S.

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