Tag: M.W=250-300

Kitaori, Kazuhiro published the artcileCsF in organic synthesis. A convenient synthesis of cyclopropano lactone from glycidyl nosylate, SDS of cas: 115314-17-5, the publication is Synlett (1998), 499-500, database is CAplus.

(S)-glycidyl 3-nitrobenzenesulfonate (nosylate) is transformed in 1-pot to cyclopropano lactones I (Me, Et, CH₂:CHCH₂, PhCH₂, 4-O₂NC₆H₄CH₂) with high enantioselectivity by reaction with appropriate CH₂(CO₂R)₂ in the presence of CsF in DMF.

Synlett published new progress about 115314-17-5. 115314-17-5 belongs to esters-buliding-blocks, auxiliary class Epoxides,Chiral,Nitro Compound,Sulfonate,Benzene, name is (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, and the molecular formula is C9H9NO6S, SDS of cas: 115314-17-5.

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

Noble, Adam published the artcileVisible-Light-Mediated Decarboxylative Radical Additions to Vinyl Boronic Esters: Rapid Access to γ-Amino Boronic Esters, Quality Control of 1850305-80-4, the publication is Angewandte Chemie, International Edition (2018), 57(8), 2155-2159, database is CAplus and MEDLINE.

The synthesis of alkyl boronic esters by direct decarboxylative radical addition of carboxylic acids to vinyl boronic esters is described. The reaction proceeds under mild photoredox catalysis and involves an unprecedented single-electron reduction of an α-boryl radical intermediate to the corresponding anion. The reaction is amenable to a diverse range of substrates, including α-amino, α-oxy, and alkyl carboxylic acids, thus providing a novel method to rapidly access boron-containing mols. of potential biol. importance.

Angewandte Chemie, International Edition published new progress about 1850305-80-4. 1850305-80-4 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester,Boronic Acids,Boronate Esters, name is tert-Butyl N-[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)propyl]carbamate, and the molecular formula is C14H28BNO4, Quality Control of 1850305-80-4.

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

Liu, Qiaoyang published the artcilePreparation and UV -curing properties of oxazolidine-2-one based acrylates, Formula: C15H20O6, the publication is Polymers for Advanced Technologies (2022), 33(8), 2416-2424, database is CAplus.

Three oxazolidine-2-one based acrylates monomers were synthesized by the reaction of oxazolidine-2-one with 1,6-hexanediol diacrylate (HDDA), neopentyl glycol diacrylate (NPGDA) and trimethylolpropane triacrylate (TMPTA). The mol. structures of the products were characterized by FT-IR, ¹H NMR and electrospray ionization high resolution mass spectrometry (ESI-HRMS). The photo-polymerization kinetics of the synthesized oxazolidine-2-one based acrylates were investigated by real-time IR spectroscopy. The results showed that the oxazolidine-2-one based acrylates with 1 weight% 2-isopropylthioxanthone (ITX) could be cured to form a transparent film under UV irradiation The UV curing speed of oxazolidine-2-one based acrylates with 1 weight% ITX was better than that of TMPTA with 1 weight% ITX and 3 weight% Et 4-(dimethylamino) benzoate (EDB) as co-initiator. Based on the HRMS anal. of oligomers extracted from the UV-cured film, the plausible photopolymerization mechanism was proposed. The synthesized monomer formula with CN996 resin can be 3D printed forming various models with smooth surface, good accuracy, excellent thermal stability and 99.4% gel content.

Polymers for Advanced Technologies 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, Formula: C15H20O6.

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

Xue, Tanlong published the artcileA bis-acrylate functionalized enone as photoinitiator and crosslinker in photopolymerization, Synthetic Route of 15625-89-5, the publication is Progress in Organic Coatings (2022), 106587, database is CAplus.

Enone dyes have gained considerable interest in photoinitiation systems due to their facile synthesis, good light absorption, and photobleaching ability during photopolymerization However, besides acting as photoinitiator, little work was dedicated to developing new function for enone dyes in polymer synthesis by photopolymerization In this work, a bis-acrylate functionalized enone derivative (C3POAC) was synthesized and characterized, which is expected to serve not only as a photoinitiator but also as a crosslinker. Steady state photolysis was carried out to show the high photochem. reactivity of C3POAC with an amine co-initiator. The initiation efficiency of C3POAC towards different acrylate monomers was evaluated by real-time FTIR technol. In most cases, good polymerization profiles were obtained. In addition, C3POAC presented the dual role of photoinitiator and crosslinker in the photopolymerization of Bu acrylate.

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 C7H16Cl2Si, Synthetic Route of 15625-89-5.

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

Song, Mingzhang published the artcileEffect of viscoelasticity on the foaming behavior of long-chain branched polypropylene with different branching degrees analysed by using bubble-growth modelling, Recommanded Product: Trimethylolpropane triacrylate, the publication is Polymer (2022), 124397, database is CAplus.

Long-chain branched polypropylene (LCB-PP) was generated by a melt grafting reaction with trimethylolpropane triacrylate (TMPTA) as the grafting monomer and zinc dimethyldithiocarbamate (ZDMC) or styrene (St) as the co-monomers. High-temperature size exclusion chromatog. (HT-SEC) was used to characterize the mol. mass, mol. mass distribution and branching degree of the modified PP. Subsequently, linear and nonlinear viscoelasticity data were obtained by a small amplitude oscillatory shear (SAOS) test and uniaxial extensional viscosity measurement. The pressure balanced bubble-growth (PBB) model was used to calculate the critical coalescence radius (CCR) curves for PP to quant. correlate the viscoelasticity and foamability and evaluate the foamability of PP combined with batch foaming. It is shown that with increasing branching degree, the foam shows a better resistance to bubble coalescence, resulting in a more regular bubble structure and a higher expansion ratio. Moreover, viscosity should be controlled over an appropriate range for realizing good foamability; otherwise, excessive viscosity can suppress bubble growth and limit the expansion ratio. MPPZ4 modified with 4 wt% TMPTA and 0.4 wt% ZDMC showed the best foamability. A combination of the PBB model and batch foaming experiment is used to quant. explain the contribution of LCB to foaming.

Polymer 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 C22H21N3O3S, Recommanded Product: Trimethylolpropane triacrylate.

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

Pan, Zhenxue published the artcileSynthesis and properties of new multifunctional photosensitive carbosilanes, Quality Control of 15625-89-5, the publication is Tetrahedron Letters (2022), 153931, database is CAplus.

Though the phys. blending polymeric preceramic and photosensitive compounds has been proved an easily scaled-up and cost-effective approach to prepare photocurable precursors for most of silicon-based ceramics, there is still scarce of practical photocurable precursor system to SiC ceramic, due to poor compatibility between polycarbosilane and com. available photosensitizers. Also, in contrast to intensive research on polymeric precursor, no attention has been paid on development of photosensitive compounds for preceramic polymers. In this work, a series of photosensitive carbosilanes containing Si-C backbone and acrylate group was designed and synthesized, which showed good compatibility with polycarbosilanes. The calculation result on the solubility parameters of the carbosilanes and polycarbosilanes well explained their good compatibility. The UV-curing behavior and thermal properties of the photosensitive carbosilanes and their blend systems with polycarbosilanes were also studied. This work provides useful guidelines for selecting and designing photosensitive compounds have good compatibility with preceramic polymers.

Tetrahedron Letters 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, Quality Control of 15625-89-5.

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

Su, Fang published the artcilePhotopolymerization and reaction sintering enabled generative shaping and material-forming of complex ceramic structures with high performance, Category: esters-buliding-blocks, the publication is Additive Manufacturing (2022), 102651, database is CAplus.

This study presents a novel combined generative shaping and material-forming (GSM) approach for preparing tritium breeder units for fusion reactors using 3D printing technol. For the first time, defect-free lithium-rich Li₄SiO₄ porous structures were successfully prepared by combining photopolymerization and reaction sintering processes based on the use of low-cost Li₂CO₃ and SiO₂ ceramic powders. Investigation was conducted on the preparation of the ceramic powder-based mixture slurry as well as the photopolymerization 3D printing and reaction sintering processes. Li₄SiO₄-based porous lattice ceramics with high purity, no obvious defects, and adjustable packing fraction were fabricated. The mech. properties of the samples prepared with different packing fractions were then evaluated. The prepared samples showed better mech. properties than the pebble bed structures with similar packing fractions. At a packing fraction of 92.10%, the crushing strength and elastic modulus reached 186.49 ± 0.04 MPa and 16.47 ± 0.03 GPa, resp. These results show that the combination of photopolymerization 3D printing and reaction sintering processes based on the use of low-cost ceramic powders has significant advantages in terms of flexibility and efficiency in structure design and fabrication and cost-effectiveness in material forming with enhanced performance, providing a promising route to produce high-performance tritium breeder structures for fusion technologies. In particular, the present combined method also paves a promising generalized way to enable effective generative structure-shaping and material-forming in the advanced ceramic manufacturing industry, not to mention that the preparation of high-performance Li₄SiO₄ tritium breeder units for fusion technologies.

Additive Manufacturing 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 C16H24BF4Ir, Category: esters-buliding-blocks.

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

Edwards, David R. published the artcileCatalytic Proficiency: The Extreme Case of S-O Cleaving Sulfatases, Application of Potassium 4-nitrophenyl sulfate, the publication is Journal of the American Chemical Society (2012), 134(1), 525-531, database is CAplus and MEDLINE.

As benchmarks for judging the catalytic power of sulfate monoesterases, we sought to determine the rates of spontaneous hydrolysis of unactivated alkyl sulfate monoesters by S-O bond cleavage. Neopentyl sulfate proved to be unsuitable for this purpose, since it was found to undergo hydrolysis by a C-O bond cleaving mechanism with rearrangement of its carbon skeleton. Instead, we examined the temperature dependence of the spontaneous hydrolyzes of aryl sulfate monoesters, which proceed by S-O cleavage. Extrapolation of a Bronsted plot [log(k₂₅^N) = (-1.81 ± 0.09) pK_a^LG + (3.6 ± 0.7)] based on the rate constants at 25 °C for hydrolysis of a series of sulfate monoesters to a pK_a^LG value of 16.1, typical of an aliphatic alc., yields k₂₅^N = 3 × 10^-26 s^-1. Comparison of that value with established k_cat values of bacterial sulfatases indicates that these enzymes produce rate enhancements (k_cat/k_uncat) of up to 2 × 10²⁶-fold for the hydrolysis of sulfate monoesters. These rate enhancements surpass by several orders of magnitude the ∼10²¹-fold rate enhancements that are generated by phosphohydrolases, the most powerful biol. catalysts previously known. The hydrolytic rates of phosphate and sulfate monoesters are compared directly, and the misleading impression that the two classes of ester are of similar reactivity is dispelled.

Journal of the American Chemical Society 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, Application of Potassium 4-nitrophenyl sulfate.

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

Mei, W. T. published the artcilePreparation and UV curing properties of oxazolidinone-based acrylate derivatives, SDS of cas: 15625-89-5, the publication is Reactive & Functional Polymers (2022), 105250, database is CAplus.

The oxazolidinone-based acrylate derivatives were prepared by the oxa-Michael addition reaction of neopentyl glycol diacrylate (NPGDA), trimethylolpropane triacrylate (TMPTA) and ethylene glycol dimethacrylate (EGDMA) with 3-(2-hydroxyethyl)-2-oxazolidinone (Z1), which was prepared by the reaction of di-Me carbonate (DMC) with diethanolamine (DEA). The mol. structures of the products were characterized by FT-IR, ¹H NMR and electrospray ionization high resolution mass spectrometry (ESI-HRMS). Under initiated by 1 weight% 2-isopropyl-9H-thioxanthen-9-one (ITX) and 1 weight% 2-hydroxy-2-methyl-1-phenylpropan-1-one (Da-1173), the oxazolidinone- based acrylates were cured in 30 s with double bond conversion of 92% and 98%, resp. The photopolymerization activity is in the order of oxazolidinone-based acrylate > conventional acrylate with 3 weight% EDB > conventional acrylate. The first-order kinetics for oxazolidinone part indicates that the oxazolidinone group is a hydrogen donor, which can terminate the polymeric radicals, forming an active radical to re-initiate the polymerization HRMS anal. of oligomers extracted from the UV-cured film of Bu acrylate confirms further the role of oxazolidinone part, and the plausible UV polymerization mechanism was proposed. The composition of addition product of TMPTA with Z1 (named as TMPTA-Z1) with epoxy acrylate can be 3D printed forming various models with the hardness of 5H.

Reactive & Functional Polymers 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

Wang, Kejie published the artcileSiC paste with high curing thickness for stereolithography, Recommanded Product: Trimethylolpropane triacrylate, the publication is Ceramics International (2022), 48(S19), 28692-28703, database is CAplus.

In this study, the method and mechanism of the improvement of the curing thickness of SiC by stereolithog. (SLA) were investigated, the rheol. properties of SiC paste were optimized, and the problem of cracking problem during debinding was solved. The best molding process for preparing SiC ceramics with the Ceramaker 900 equipment was studied. Oxidation at 1180°C for 1 h and hydroxylation with 0.6 mol/L H₂O₂ were the best modification processes for SiC powder. SiC paste with good rheol. properties and high curing thickness was prepared using a resin system of BPA, HDDA, TPGDA, TMPTA, DPHA, and A-BPEF (mass ratio = 9:7:5:20:15:6). The best debinding process for SLA SiC was segmented debinding. The bulk d., total porosity, and room temperature bending strength of the SiC ceramics obtained are 2.13 g/cm³, 10.2%, 229 MPa, resp. The nanoindentation elastic modulus and hardness of SLA SiC ceramics were found to be 18.7 and 1.66 GPa, resp. Through this process, a lattice structure of SiC parts with good surface quality was prepared

Ceramics International 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 C18H23OP, Recommanded Product: Trimethylolpropane triacrylate.

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