Month: October 2022

Tam, Wilson; Guerin, Brigitte; Calabrese, Joseph C.; Stevenson, Sylvia H. published the artcile< 3-Methyl-4-methoxy-4'-nitrostilbene (MMONS): crystal structure of a highly efficient material for second-harmonic generation>, HPLC of Formula: 112-63-0, the main research area is laser second harmonic generation stilbene derivative; stilbene methyl methoxy nitro preparation structure; structure methylmethoxynitrostilbene crystal; methylstilbene preparation structure; nitrostilbene preparation structure; methoxystilbene preparation structure.

The preparation and crystal structure of 3-methyl-4-methoxy-4′-nitrostilbene (MMONS) are reported. MMONS generates second-harmonic radiation with a powder efficiency 1250 times that of urea; this is the largest measured powder SHG efficiency reported to date. MMONS is orthorhombic, space group Aba2, with a 15.584(1), b 13.463(1), and c 13.299(3) Å at 70°; dc = 1.282 for Z = 8. Final R = 0.043 (Rw = 0.041) for 950 reflections. The packing is made up of stacks of 4 mols. in a donor-acceptor-acceptor-donor configuration with π-π interactions resulting in short intermol. distances between these 4 Ph rings of 3.36-3.50 Å. It is suggested that charge-transfer excitons within the crystal may account for the large observed nonlinearity.

Chemical Physics Letters published new progress about Crystal structure. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Okumura, Takefumi; Kawaji, Jun published the artcile< Research and development of thermally durable electrolyte for lithium ion battery>, Product Details of C19H34O2, the main research area is thermally durable electrolyte lithium ion battery.

For ensuring safety of lithium ion batteries (LIBs), we have extensively investigated the quasi-solid electrolyte where lithium ion conducive liquid is quasi-solidified at silica surfaces as thermally durable electrolyte, and applied it to high capacity and high energy d. LIB. For the liquid phase, a solvate ionic liquid, which is an equimolar complex of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and tetraethylene glycol di-Me ether (G4), Li(G4)TFSA, was used. For enhancing discharge capability at a higher rate, Li(G4)TFSA was diluted by low viscos solvent such as propylene carbonate (PC). The developed electrolyte possessed a favorable volatilization temperature higher than 373 K. A 100-Wh-class laminated LIB with energy d. of 363 WhL-1 was fabricated by employing the electrolyte to graphite-LiNixCoyMnzO2 chem., and it generated neither fire nor smoke in a nail-penetration test. The result suggest that the developed LIB has high safety compared to a LIB comprised of a conventional organic liquid electrolyte. In addition, to enhance the cycle life of the LIB, the formation and growth mechanism of a solid-electrolyte interphase on a graphite-based neg. electrode was investigated. NMR and hard XPS revealed that the decompositions of LiTFSA, PC, and G4 contributed to the SEI formation at the initial charge, and that continuous decompositions of G4 and PC were a major reason for the SEI growth during charge-discharge cycles. Based on these anal., we have substituted a highly concentrated sulfolane based liquid which exhibits a high Li ion conductivity with less amount of the low viscos solvent, for the G4 based liquid The modification effectively improved the electrochem. durability of the electrolyte, leading to a higher capacity retention after charge-discharge cycle test.

Electrochemistry (Tokyo, Japan) published new progress about Battery electrolytes (Thermally Durable). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Shi, Xiangyang; Cassagneau, Thierry; Caruso, Frank published the artcile< Electrostatic Interactions between Polyelectrolytes and a Titania Precursor: Thin Film and Solution Studies>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is electrostatic adsorption polyelectrolyte titania precursor; layer by layer self assembly titania film formation.

A facile approach, based on the polyelectrolyte-mediated electrostatic adsorption of a H2O-soluble TiO2 precursor, Ti (IV) bis (ammonium lactato) dihydroxide (TALH), is presented for the formation of multilayered thin films of defined thickness and composition The thin films were formed by the alternate deposition of TALH and pos. charged polyelectrolyte [poly(diallyldimethylammonium chloride), PDADMAC, poly(allylamine hydrochloride), PAH, and chitosan, CH] using electrostatic interactions for film formation. Layer-by-layer film growth was monitored by UV-visible spectrophotometry, ellipsometry, and by a quartz crystal microbalance (QCM). The UV-visible, ellipsometric, and QCM data all showed that a uniform amount of TALH was deposited with each alternate deposition cycle of polyelectrolyte and TALH, indicating that TALH binds to pos. charged polyelectrolytes. Using PDADMAC/TALH as a model system, the influence of drying on multilayer film formation was examined by QCM. These experiments showed that H2O-equilibrated multilayers facilitated the binding of TALH to PDADMAC. The electrostatic nature of the binding between TALH and pos. charged polyelectrolytes was confirmed by fluorescence studies in aqueous solution Removal of the anionic probe, pyrenetetrasulfonic acid (4-PSA), precomplexed to PDADMAC in aqueous solution, was observed upon the addition of TALH. PDADMAC/TALH multilayers were also constructed on colloid particles to gain insight into the binding behavior between the deposited species. The results suggest that multilayer film formation is facilitated via the deposition of oligomeric species of TALH. The approach presented here may be exploited for the fabrication of novel advanced TiO2-based materials (e.g. thin films, porous structures, and composite colloids).

Langmuir published new progress about Adsorption (electrostatic). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Sobhani, Sara; Fielenbach, Doris; Marigo, Mauro; Wabnitz, Tobias C.; Joergensen, Karl Anker published the artcile< Direct organocatalytic asymmetric α-sulfenylation of activated C-H bonds in lactones, lactams, and β-dicarbonyl compounds>, SDS of cas: 112-63-0, the main research area is cinchona alkaloid catalyst stereoselective sulfenylation lactone lactam dicarbonyl compound.

The application of cinchona alkaloid derivatives as catalysts for enantioselective α-sulfenylation of activated C-H bonds in lactones, lactams, and β-dicarbonyl compounds by different electrophilic sulfur reagents is presented. Optically active products are obtained in good to excellent yields and up to 91 % ee. Furthermore, the diastereoselective reduction of α-sulfenylated β-keto esters to give optically active α-sulfenylated β-hydroxy esters has been studied. A model for the intermediate is presented, in which the protonated cinchona alkaloid interacts with the substrate leading to face-shielding in accordance with the enantioselective α-sulfenylation step.

Chemistry – A European Journal published new progress about 1,3-Dicarbonyl compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Huang, Wei-Ming; Liao, Wei-Sheng; Lai, Yan-Ming; Chen, I-Wen Peter published the artcile< Tuning the surface charge density of exfoliated thin molybdenum disulfide sheets via non-covalent functionalization for promoting hydrogen evolution reaction>, HPLC of Formula: 112-63-0, the main research area is molybdenum sulfide sheet electrocatalyst exfoliation surface charge density tuning.

The scalable and facile generation of hydrogen fuel via water splitting requires robust and cost-effective earth-abundant electrocatalysts for hydrogen evolution reaction (HER). It is reported for the first time that the surface charge d. of exfoliated monolayer molybdenum disulfide (MoS2) sheets can be successfully tuned with the assistance of exfoliants, such as pyridinium tribromide (py), imidazole (i.m.), and chlorophyll (ch), and thereby significantly affect the kinetics of the HER. The surface charge potential of the exfoliated monolayer py-MoS2, i.m.-MoS2, and ch-MoS2 sheets are -33 mV, -22 mV, and -2 mV, resp. As the surface charge potential approaches zero, the Tafel slope required varies from 140 mV dec-1 for py-MoS2 to 45 mV dec-1 for ch-MoS2. Moreover, to achieve real-world applications, the exfoliated thin ch-MoS2 sheets were fabricated to form flexible composite papers, and they exhibited excellent electrocatalytic activity with further enhanced Tafel slope of 35 mV dec-1, which is nearly identical to that of bulk Pt, “”the gold standard”” for HER, an ultra-low onset potential of -42 mV and over 100 h of electrochem. durability. This convenient non-covalent functionalization method provides opportunities for many other applications of exfoliated thin MoS2 sheets and other two-dimensional transition metal dichalcogenides (2D-TMDCs).

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about Carbon nanotubes. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Sun, Shiqin; Cheng, Xueli; Ma, Meiyuan; Liu, Yue; Wang, Guanghao; Yu, Hailong; Liu, Shiwei; Yu, Shitao published the artcile< High-efficient esterification of rosin and glycerol catalyzed by novel rare earth Lewis acidic ionic liquid: Reaction development and mechanistic study>, Product Details of C19H34O2, the main research area is ionic liquid catalyst rosin esterification glycerol reaction development.

As one of the most important modified products of rosin, rosin glyceride was widely used in many aspects. However, the preparation of rosin glyceride is always unfriendly due to the use of liquid catalyst, such as H2SO4 and H3PO4. The rosin glyceride with low acid value was synthesized in vacuum conditions using a novel Lewis acidic ionic liquid 1-butyl-3-methylimidazolium chloroscandinate[BuMeim][Sc2Cl7] as catalyst. The [BuMeim][Sc2Cl7] is of excellent catalytic activity and stability. The efficient catalytic activity was studied via the combined D. Functional Theory (DFT) and exptl. conditions. The DFT proved the free energy of the esterification could reach to 31.6 Kcal/mol, which illuminates that the excellent coordination of the anions and cations in the [BuMeim][Sc2Cl7] greatly reduces the reaction energy barrier and promotes the efficient progress of the reaction. As a result, [BuMeim][Sc2Cl7] is a good catalyst for the esterification of rosin and glycerol to prepare rosin glyceride. Furthermore, [BuMeim][Sc2Cl7] could be a potential catalysts for the other esterification.

Journal of the Taiwan Institute of Chemical Engineers published new progress about Esterification. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhang, Hui; Shang, Yan; Zhao, Hong; Wang, Xuan; Han, Baozhong; Li, Zesheng published the artcile< Further discussion on the reaction behaviour of triallyl isocyanurate in the UV radiation cross-linking process of polyethylene: a theoretical study>, Application of C18H26O6, the main research area is triallyl isocyanurate polyethylene crosslinking UV radiation; UV radiation cross-linking polyethylene process; transition states; triallyl isocyanurate.

Further theor. investigation on the reaction behavior of triallyl isocyanurate (TAIC) in the UV radiation crosslinking process of polyethylene (PE) is accomplished by d. functional theory for high voltage cable insulation materials. The reaction potential energy information of the 13 reaction channels at B3LYP/6-311 + G(d,p) level are identified. These have been explored that the TAIC take part in the reaction behavior on ground state during UV radiation crosslinking process and TAIC intra-mol. isomerization reaction itself. In addition, the results show that the effect of multiplication and acceleration for the crosslinking reaction of trimethylolpropane trimethacrylate(TMPTMA) would be better than that of TAIC. It has further clarified the reasons why UV radiation crosslinking reaction of PE had been initiated by benzophenone (Bp), and the TAIC or TMPTMA needed to take part. The results obtained in the present study could directly guide both the optimization of UV radiation crosslinking PE process and the development of the insulation material of high-voltage cable in real application.

Royal Society Open Science published new progress about Band gap. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Application of C18H26O6.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Wu, Jingjie; Bao, Fengda; Ye, Xiaoxia; Li, Juan; Jiang, Jun published the artcile< Asymmetric Construction of Highly Functionalized Cyclobutanones Bearing Three Contiguous Stereogenic Centers by an Amino Acid Salt-Catalyzed Desymmetrization Reaction>, Formula: C19H34O2, the main research area is functionalized cyclobutanone preparation; cyclobutanone keto ester desymmetrization amino acid salt catalyzed.

An amino acid salt-catalyzed direct desymmetrization of 3-substituted cyclobutanones through a direct aldol reaction under mild reaction conditions was reported. The developed method provided an array of highly functionalized cyclobutanones bearing three contiguous stereogenic centers I [R = H, CO2Et; Ar = Ph, 2-FC6H4, 2-naphthyl, etc.; n = 1,2,3] in high yields and stereoselectivities with varied functional-group compatibility. Furthermore, the obtained adducts could be smoothly converted into polyfunctional 1,4-butyrolactones with maintained enantioselectivity.

Synlett published new progress about Cyclobutanones Role: PRP (Properties), RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics