Category: esters-buliding-blocks

Liu, Jian published the artcilePrinting 3D Of Complex-Shaped Polymer-Derived Ceramics With Enhanced Structural Retention, Recommanded Product: Trimethylolpropane triacrylate, the publication is Materials and Manufacturing Processes (2022), 37(11), 1267-1279, database is CAplus.

The combination of polymer-derived ceramics and DLP 3D printing has significant advantages for manufacturing special polynary ceramics with complex structures. However, a large number of the organic components in the precursor rapidly burn out and release after evaporation during pyrolysis. This leads to structural retention issues such as sample deformation, shrinkage and cracking. The surface morphol. and accuracy of the sample are greatly affected by the escape of organic matter and the release of thermal stress during the pyrolysis process. Therefore, this study employs the method of adding low-melting-point silicone oil based on the original material components. The slow burn-out process of silicone oil at a lower temperature can produce fine pores, which would aid the release of thermal stress. Addnl., it can provide channels for escape of the organic gas at high-temperature, which helps to reduce large deformation and cracking and improves the surface morphol. and dimensional accuracy of the final pyrolyzed samples. The method studied in this work helps to enhance the structural retention of complex-shaped polymer-derived ceramics manufactured by 3D printing and high-temperature pyrolysis, which could be beneficial to the further mass fabrication of such ceramic products.

Materials and Manufacturing Processes 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, Recommanded Product: Trimethylolpropane triacrylate.

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

Luo, Yani published the artcileCopper-Catalyzed Three-Component Germyl Peroxidation of Alkenes, Category: esters-buliding-blocks, the publication is Organic Letters (2022), 24(12), 2425-2430, database is CAplus and MEDLINE.

The concurrent incorporation of a germyl fragment and another functional group (beyond the hydrogen atom) across the C=C double bond is a highly appealing yet challenging task. Herein, the efficient germyl peroxidation of alkenes with germanium hydrides and tert-Bu hydroperoxide via a copper-catalyzed three-component radical relay strategy is demonstrated. This protocol exhibits excellent functional group tolerance and exquisite chemo- and regioselectivity under mild conditions and represents a rare example of constructing synthetically challenging metal-embedded organic peroxides.

Organic Letters 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, Category: esters-buliding-blocks.

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

Luo, Yani published the artcileCopper-Catalyzed Three-Component Germyl Peroxidation of Alkenes, HPLC of Formula: 624-49-7, the publication is Organic Letters (2022), 24(12), 2425-2430, database is CAplus and MEDLINE.

The concurrent incorporation of a germyl fragment and another functional group (beyond the hydrogen atom) across the C=C double bond is a highly appealing yet challenging task. Herein, the efficient germyl peroxidation of alkenes with germanium hydrides and tert-Bu hydroperoxide via a copper-catalyzed three-component radical relay strategy is demonstrated. This protocol exhibits excellent functional group tolerance and exquisite chemo- and regioselectivity under mild conditions and represents a rare example of constructing synthetically challenging metal-embedded organic peroxides.

Organic Letters published new progress about 624-49-7. 624-49-7 belongs to esters-buliding-blocks, auxiliary class Inhibitor,Natural product, name is Dimethyl fumarate, and the molecular formula is C6H8O4, HPLC of Formula: 624-49-7.

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

Wang, Jia published the artcileCatalytic Conversion of Bamboo Sawdust over ZrO₂-CeO₂/γ-Al₂O₃ to Produce Ketonic Hydrocarbon Precursors and Furans, Formula: C6H8O3, the publication is ACS Sustainable Chemistry & Engineering (2018), 6(11), 13797-13806, database is CAplus.

A series of metal oxides including ZrO₂/γ-Al₂O₃, CeO₂/γ-Al₂O₃, and ZrO₂-CeO₂/γ-Al₂O₃ were synthesized and employed to conduct catalytic fast pyrolysis of bamboo sawdust via an anal. pyrolyzer/gas chromatograph/mass spectrometer (Py-GC/MS) to produce hydrocarbon precursors such as ketones and furans. Exptl. results illustrated that the use of metal oxides enhanced the formation of ketones and monoarom. hydrocarbons compared to catalyst-free trial. Among the metal oxides, ZrO₂-CeO₂/γ-Al₂O₃ exhibited the most significant ketonization and aldol condensation activities yielding the highest concentration of linear and cyclic ketones. In addition, nonacidic oxygenates such as furfural, acetol, butanedial, 2,3-dihydrobenzofuran, and Me acetate, were efficiently converted into hydrocarbon precursors over metal oxides. A dual catalytic bed system integrating ZrO₂-CeO₂/γ-Al₂O₃ and HZSM-5 significantly facilitated the production of aromatic hydrocarbons compared to pure HZSM-5 catalytic run. The use of ZrO₂-CeO₂/γ-Al₂O₃ mixed with HZSM-5 mode maximized the formation of xylenes, while ZrO₂-CeO₂/γ-Al₂O₃ mixed with bamboo sawdust catalytic trial increased the concentration of benzene, toluene, and alkylbenzenes.

ACS Sustainable Chemistry & Engineering 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 C10H18O, Formula: C6H8O3.

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

Yang, Rulin published the artcileSelective, Sequential, and “One-Pot” Depolymerization Strategies for Chemical Recycling of Commercial Plastics and Mixed Plastics, Computed Properties of 627-93-0, the publication is ACS Sustainable Chemistry & Engineering (2022), 10(30), 9860-9871, database is CAplus.

The com. plastics that are currently used in large-scale are primarily concerned with performance and durability, rather than degradability and recyclability. As a result, the chem. recycling of plastics becomes a significant challenge. Selective depolymerization of the mixed plastic waste is a promising solution to the challenges caused by plastic accumulation. Here we present sequential and “one-pot” depolymerization strategies for chem. recycling of com. plastics (PLA, BPA-PC, PBS, PBAT, PCL, and PET) and mixed plastics (BPA-PC/PET, PLA/PBS, and PLA/PBAT) to their initial monomers or value-added chems. Taking advantage of the differences in depolymerization reactivity of com. plastics and versatile catalytic degradation ability of zinc bis[bis(trimethylsilyl)amide] [Zn(HMDS)₂], the selective depolymerization process was smoothly achieved under mild conditions. These strategies provide ideas for promoting the sustainable development of plastics that are currently being used in large-scale.

ACS Sustainable Chemistry & Engineering 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 C5H9IO2, Computed Properties of 627-93-0.

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

Qiu, Teng published the artcileSynthesis of poly(lactic acid)-based macro-porous foams with thermo-active shape memory property via W/O high internal phase emulsion polymerization, Name: Trimethylolpropane triacrylate, the publication is Colloid and Polymer Science (2022), 300(4), 415-427, database is CAplus.

Here, the synthesis of macro-porous polymer foams by using bio-based poly(lactic acid) (PLA) as macro-monomer was carried out via W/O high internal phase emulsion (HIPE) polymerization The PLA macro-monomer end-capped by di-acrylate groups was employed as the continuous phase and copolymerized with fluorinated methacrylate, 2-ethylhexyl acrylate, and acrylate crosslinkers. The interconnected macro-porous polyHIPEs showed the thermo-responsive shape memory property. It is found that the transition temperature (Ttrans) of the polyHIPEs in shape recover cycle is adjustable in the temperature range from 24.5 to 107.8°, corresponding to their glass transition temperature (Tg), which can be controlled by the ratio of macro-, fluorinated, and acrylate monomers. In this work, the best shape memory property is obtained with a PLA content over 40%. The corresponding polyHIPEs could change their shape with a compress ratio as high as 50% at the temperature above Ttrans, maintain the temporary shape by cooling to room temperature, and exhibit a nearly 100% recovery upon reheating. Scanning electron microscope (SEM) results suggest that the macro-porous structure can be maintained without collapse of the pores in at least four compression-recovery cycles. These polyHIPEs also have degradation capabilities.

Colloid and Polymer Science 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, Name: Trimethylolpropane triacrylate.

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

Li, Li-feng published the artcileSynthesis of 3-difluoromethyl-1-methyl-1H-pyrazol-4-carboxylic acid, HPLC of Formula: 924-99-2, the publication is Jingxi Huagong Zhongjianti (2013), 43(6), 17-19, 47, database is CAplus.

3-Difluoromethyl-1-methyl-1H-pyrazol-4-carboxylic acid was prepared in overall yield of 52% with purity of 98% (HPLC) starting from propargyl alc. through several reaction steps including oxidation, esterification, addition, methylation and hydrolysis.

Jingxi Huagong Zhongjianti published new progress about 924-99-2. 924-99-2 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Amine,Aliphatic hydrocarbon chain,Ester, name is Ethyl 3-(dimethylamino)acrylate, and the molecular formula is C7H13NO2, HPLC of Formula: 924-99-2.

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

Yang, Han-Lin published the artcileBase-iodine-promoted metal-catalyst-free reactions of [60]fullerene with β-keto esters for the selective formation of [60]fullerene derivatives, COA of Formula: C6H10O3, the publication is RSC Advances (2020), 10(41), 24549-24554, database is CAplus and MEDLINE.

Methanofullerenes and 2′,3′-dihydrofuran C₆₀derivatives were selectively synthesized in high yields via the reactions of C₆₀with β-keto esters under mild conditions by controlling the addition sequence and molar ratio of iodine and base. The structures of the products were determined by spectroscopic characterization. Moreover, a possible reaction mechanism for the selective formation of fullerene derivatives was proposed.

RSC Advances 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 C20H28B2O4S2, COA of Formula: C6H10O3.

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

Chen, Yunle published the artcileResponse of the Aerodyne Aerosol Mass Spectrometer to Inorganic Sulfates and Organosulfur Compounds: Applications in Field and Laboratory Measurements, COA of Formula: C6H4KNO6S, the publication is Environmental Science & Technology (2019), 53(9), 5176-5186, database is CAplus and MEDLINE.

Organosulfur compounds are important components of secondary organic aerosols (SOA). While Aerodyne high-resolution time-of-flight aerosol mass spectrometers (AMS) have been extensively used in aerosol studies, the AMS response to organosulfur compounds is not well understood. This work assessed fragmentation patterns of organosulfur and inorganic sulfate compounds in the AMS, developed a method to deconvolve total sulfates into components of inorganic and organic origins, and applied this method in laboratory and field measurements. Apportionment results from laboratory isoprene photooxidation experiments showed that with an inorganic sulfate seed, sulfate functionality of organic origins can contribute ∼7% of SOA mass at peak growth. Results from southeastern US measurements showed 4% of measured sulfate is from organosulfur compounds Methanesulfonic acid was estimated for coastal and remote marine boundary layer measurements. Application of this method was assessed for unit mass-resolution data, where it performed less well due to interferences. Apportionment results demonstrated organosulfur compounds could be a non-negligible source of sulfate fragments in AMS laboratory and field datasets. A re-evaluation of previous AMS measurements over the full range of atm. conditions using this method could provide a global estimate/constraint on the contribution of organosulfur compounds

Environmental Science & Technology published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C6H4KNO6S, COA of Formula: C6H4KNO6S.

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

Zhang, Wen published the artcilePalladium-catalyzed asymmetric allylic substitutions by axially chiral P,S-, S,S-, and S,O-heterodonor ligands with a binaphthalene framework, Application In Synthesis of 126613-06-7, the publication is Tetrahedron: Asymmetry (2004), 15(19), 3161-3169, database is CAplus.

Axially chiral P,S-heterodonor ligand I is effective in the asym. allylic substitution of 1,3-diphenylpropenyl acetate with di-Me malonate. Its bidentate coordination pattern to a Pd metal center with both P and S atoms has been unambiguously established by X-ray diffraction and NMR spectroscopic analyses. Herein, we further disclose that axially chiral S,S-heterodonor ligands II (R = Me₂NC(S)O, MeS, and Ph₂CHS) are also effective in the same reaction to give the allylic alkylation product in moderate to good ee. However, the corresponding S,O-heterodonor ligands are not as effective as the corresponding P,S- or S,S-heterodonor ligands in the same asym. reaction.

Tetrahedron: Asymmetry 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 C22H21N3O3S, Application In Synthesis of 126613-06-7.

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