Month: November 2022

Lin, Rui; Xu, Yimin; Xie, Sidi; Zhang, Yunxiao; Wang, Hai; Yi, Guo-Zhong; Huang, Guanglong; Ni, Bowen; Song, Haimin; Wang, Ziyu; Qi, Song-Tao; Liu, Yawei published the artcile< Recycling of SLC38A1 to the plasma membrane by DSCR3 promotes acquired temozolomide resistance in glioblastoma>, Formula: C19H34O2, the main research area is glioblastoma SLC38A1 plasma membrane DSCR3 temozolomide resistance; Acquired TMZ resistance; DSCR3; Endosomal sorting; Glioblastoma; Glioma; SLC38A1.

Glioblastoma multiforme (GBM) is a primary brain tumor with devastating prognosis. Although the O6-methylguanine-DNA methyltransferase (MGMT) leads to inherent temozolomide (TMZ) resistance, approx. half of GBMs were sufficient to confer acquired TMZ resistance, which express low levels of MGMT. The purpose of this study was to investigate the underlying mechanisms of the acquired TMZ resistance in MGMT-deficient GBM. The function of Down syndrome critical region protein 3 (DSCR3) on MGMT-deficient GBM was investigated in vitro and in an orthotopic brain tumor model in mice. Purification of plasma membrane proteins by membrane-cytoplasmic separation and subsequent label free-based quant. proteomics were used to identified potential protein partners for DSCR3. Immunofluorescence was performed to show the reverse transport of solute carrier family 38 member 1 (SLC38A1) mediated by DSCR3. DSCR3 is upregulated in MGMT-deficient GBM cells during TMZ treatment. Both DSCR3 and SLC38A1 were highly expressed in recurrent GBM patients. Silencing DSCR3 or SLC38A1 expression can increase TMZ sensitivity in MGMT-deficient GBM cells. Combination of proteomics and in vitro experiments show that DSCR3 directly binds internalized SLC38A1 to mediate its sorting into recycling pathway, which maintains the abundance on plasma membrane and enhances uptake of glutamine in MGMT-deficient GBM cells. DSCR3 is a crucial regulator of acquired TMZ resistance in MGMT-deficient GBM. The DSCR3-dependent recycling of SLC38A1 maintains its abundance on plasma membrane, leading to tumor progression and acquired TMZ resistance in MGMT-deficient GBM.

Journal of Neuro-Oncology published new progress about Animal gene Role: BSU (Biological Study, Unclassified), PRP (Properties), BIOL (Biological Study) (DSCR3). 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

Manaila, E.; Craciun, G.; Stelescu, M. D.; Ighigeanu, D. published the artcile< Radiation vulcanization of EPDM rubber with polyfunctional monomers>, COA of Formula: C18H26O6, the main research area is EPDM rubber radiation vulcanization crosslink density.

The most important stage in ethylene-propylene-terpolymer rubber processing technol. is vulcanization/ crosslinking. The effect of polyfunctional monomers as triallylcyanurate, triallylisocyanurate, trimethylopropane trimethacrylate, and zinc diacrylate on the crosslink d. of ethylene-propylene-terpolymer rubber processed by electron beam irradiation using a 5.5 MeV electron accelerator was presented. The dependence of cross-link d. on the irradiation dose was also determined in the dose range of 50 to 500 kGy. The results have showed that the crosslink d. is very sensitive to the polyfunctional monomers use.

Acta Physica Polonica A published new progress about Crosslink density. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, COA of Formula: C18H26O6.

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

Chen, Yinyan; Wu, Yiban; Zhu, Yifan; Tian, Saiqi published the artcile< A fluorescent polyurethane foam based on rhodamine derivative as Fe(III) sensor in pure water>, COA of Formula: C19H34O2, the main research area is rhodamine derivative polyurethane foam preparation ferric fluorescent sensor water.

Rhodamine salicylaldehyde was synthesized, and its structure was determined using Fourier transform IR spectroscopy, 1H NMR anal. as well as electrospray ionization mass spectrometry. Then a fluorescent polyurethane foam was obtained via incorporation of the prepared rhodamine salicylaldehyde, and the fluorescence sensing behavior for Fe3+ was systematically investigated. Results showed that the fluorescent polyurethane foam produced higher fluorescence in the presence of Fe3+ in pure water, due to the coordination for Fe3+ binding leading to ring-opened amide form. The limit of detection was calculated to be 1.64 × 10-6 mol L-1. This fluorescent polyurethane foam can also recognize Fe3+ with good selectivity.

Polymer International published new progress about Cations. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

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

Kochetkov, Sergei V.; Kucherenko, Alexander S.; Zlotin, Sergei G. published the artcile< Asymmetric synthesis of warfarin and its analogs catalyzed by C2-symmetric squaramide-based primary diamines>, Formula: C19H34O2, the main research area is squaramide primary diamine preparation reusable; hydroxycoumarin unsaturated ketone squaramide catalyst enantioselective Michael reaction.

Novel C2-sym. N,N’-bis(2-amino-1,2-diphenylethyl)squaramides with 1,2-di(pyridin-2-yl)ethane and 1,2-diphenylethane spacer groups were designed and applied as organocatalysts in asym. additions of 4-hydroxycoumarin and 4-hydroxy-6-methyl-2H-pyran-2-one to α,β-unsaturated ketones. Both enantiomers of the anticoagulant warfarin and its analogs were prepared in up to 96% yield and with 96% ee. Recyclability of the developed catalysts and synthetic utility of the prepared Michael adducts for asym. synthesis of potential chiral medications via acylation reactions were demonstrated.

Organic & Biomolecular Chemistry published new progress about Acylation. 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

Torayev, Amangeldi; Engelke, Simon; Su, Zeliang; Marbella, Lauren E.; De Andrade, Vincent; Demortiere, Arnaud; Magusin, Pieter C. M. M.; Merlet, Celine; Franco, Alejandro A.; Grey, Clare P. published the artcile< Probing and Interpreting the Porosity and Tortuosity Evolution of Li-O2 Cathodes on Discharge through a Combined Experimental and Theoretical Approach>, Synthetic Route of 112-63-0, the main research area is dimethoxyethane tetraglyme lithium oxygen battery kinetic Monte Carlo model.

Li-O2 batteries offer a high theor. discharge capacity due to the formation of light discharged species such as Li2O2, which fill the porous pos. electrode. However, in practice, it is challenging to reach the theor. capacity and completely utilize the full electrode pore volume during discharge. With the formation of discharge products, the porous medium evolves, and the porosity and tortuosity factor of the pos. electrode are altered through shrinkage and clogging of pores. A pore shrinks as solid discharge products accumulate, the pore clogging when it is filled (or when access is blocked). In this study, we investigate the structural evolution of the pos. electrode through a combination of exptl. and computational techniques. Pulsed field gradient NMR results show that the electrode tortuosity factor changes much faster than suggested by the Bruggeman relation (an equation that empirically links the tortuosity factor to the porosity) and that the electrolyte solvent affects the tortuosity factor evolution. The latter is ascribed to the different abilities of solvents to dissolve reaction intermediates, which leads to different discharge product particle sizes: on discharging using 0.5 M LiTFSI in dimethoxyethane, the tortuosity factor increases much faster than for discharging in 0.5 M LiTFSI in tetraglyme. The correlation between a discharge product size and tortuosity factor is studied using a pore network model, which shows that larger discharge products generate more pore clogging. The Knudsen diffusion effect, where collisions of diffusing mols. with pore walls reduce the effective diffusion coefficients, is investigated using a kinetic Monte Carlo model and is found to have an insignificant impact on the effective diffusion coefficient for mols. in pores with diameters above 5 nm, i.e., most of the pores present in the materials investigated here. As a consequence, pore clogging is thought to be the main origin of tortuosity factor evolution.

Journal of Physical Chemistry C published new progress about Carbon black Role: TEM (Technical or Engineered Material Use), USES (Uses). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

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

Shrikhande, Savyasachi; Babu, G. Uday Bhaskar; Z., Ahmad; Patle, Dipesh S. published the artcile< Intensification and analysis of ethyl levulinate production process having a reactive distillation through vapor recompression and bottom flash techniques>, Electric Literature of 112-63-0, the main research area is ethyl levulinate production process reactive distillation through vapor recompression.

Et levulinate (EL) is an important biodiesel blending ingredient. Reactive distillation (RD) and distillation are energy intensive operations in the EL process studied in this work. Therefore, the intensification approach for energy reduction in these operations is important. In this study, we investigated the implementation of vapor recompression (VR), multistage vapor recompression (MVR) and bottom flash (BF) techniques in the EL production process having one reactive distillation and two normal distillations for the first time. New intensified cases are- VR in RD (RD-VR), BF in RD (RD-BF), MVR in C1 column (C1-MVR), BF in C2 column (C2-BF), and hybrid RD-BF/C2-BF. Performance of these intensified cases is investigated and compared against the base case in terms of energy savings, total annual cost (TAC), carbon emission, energy consumed per ton of EL and cost of processing per kg of EL. It is found that the RD-BF/C2-BF scheme yields 61% reduction in overall heating duty, 35.5% reduction in TAC, and 58.76% reduction in carbon emission, with respect to the base case. Cost of EL production is found to be $ 6.6 per kg. This study is important as it focuses on economic as well as environmental aspects.

Chemical Engineering and Processing published new progress about Equilibrium constant. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

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

Reeves, W. Preston; King, Rufus M. II; Jonas, Lynette L.; Hatlevik, Oyvind; Lu, Cuong V.; Schulmeier, Brian published the artcile< Bromination of aromatics with pyridinium hydrobromide perbromide: an organic laboratory experiment>, Computed Properties of 112-63-0, the main research area is laboratory experiment aromatic compound bromination.

Bromination of aniline and anisole derivatives with pyridinium hydrobromide perbromide (PHP) has been selectively achieved. By selecting appropriate reaction conditions, monobrominated, dibrominated, and, in some instances, tribrominated products may be obtained. PHP provides a safe end environmentally friendly way to conduct aromatic brominations. Pedagogic opportunities for this experiment are wide-ranging. GC-MS may be used for the separation of product mixtures Steric and solvent effects may also be discussed as the scope and limitations of this technique are investigated in the organic laboratory

Chemical Educator [Electronic Publication] published new progress about Aromatic compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Computed Properties of 112-63-0.

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

Zhang, Na; Wang, Taisheng; Wu, Xing; Jiang, Chen; Chen, Fang; Bai, Wei; Bai, Ruke published the artcile< Self-exfoliation of 2D covalent organic frameworks: morphology transformation induced by solvent polarity>, Reference of 112-63-0, the main research area is layered borate ester containing covalent organic nanosheet preparation; covalent organic framework borate ester preparation morphol transformation.

Recently, covalent organic nanosheets (CONs) have emerged as functional two-dimensional (2D) materials for versatile applications. Strong interaction among layers and the instability of borate ester in moisture are the major hurdles to obtain few layered B-containing CONs by exfoliation of their bulk counterparts. The authors report a facile approach for preparation of few layered borate ester-containing CONs based on electrostatic repulsion of ions. The authors incorporated organic ionic groups into porous covalent organic frameworks (COFs) and the COFs with quaternary ammonium group could self-exfoliate into few layered ionic covalent organic nanosheets (iCONs) in polar organic solvents. The morphol. of the iCOFs-A could be changed from a multilayered aggregation to nanocapsules, or 2-dimensional sheets when solvents with different polarity were used. In contrast, nonionic covalent organic frameworks COFs-B could not self-exfoliate in various solvents. The self-exfoliated nanosheets could be used to fabricate uniform thin films on SiO2 wafer and the film exhibited explicit optical and elec. properties.

RSC Advances published new progress about Composites (layered borate ester-containing nanosheets). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.

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

Feiffers, S.; Wynberg, Hans; Strating, J. published the artcile< α-Carboxylation of esters>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is malonate monoalkyl; ester alpha carboxylation; metalation alpha ester.

Esters RR1CHCO2R2 were converted to their α-Li salts, then carboxylated to give monoesters of malonic acid. Thus, to (Me2CH)2NH in THF under N at -10 to -15° was added 2M BuLi in hexane, the mixture kept 15 min, the ester in THF added over 0.5 hr, and CO2 passed 10 min to give RR1C(CO2H)CO2R2 [R, R1 = H, Me, Et, tert-Bu, Ph, or (RR1) = cyclohexyl, cyclododecyl, 2-adamantyl; R2 = Me, Et].

Tetrahedron Letters published new progress about Carboxylation. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Lazzara, Nicholas C.; Rosano, Robert J.; Vagadia, Purav P.; Giovine, Matthew T.; Bezpalko, Mark W.; Piro, Nicholas A.; Kassel, Wm. Scott; Boyko, Walter J.; Zubris, Deanna L.; Schrader, Kevin K.; Wedge, David E.; Duke, Stephen O.; Giuliano, Robert M. published the artcile< Synthesis and Biological Evaluation of 6-[(1R)-1-Hydroxyethyl]-2,4a(R),6(S),8a(R)-tetrahydropyrano-[3,2-b]-pyran-2-one and Structural Analogues of the Putative Structure of Diplopyrone>, Reference of 4098-06-0, the main research area is hydroxyethyl tetrahydropyrano pyranone analog preparation fungicide antibiotic phytotoxic catfish.

The phytotoxin diplopyrone is considered to be the main phytotoxin in a fungus that is responsible for cork oak decline. A carbohydrate-based synthesis of the enantiomer of the structure proposed for diplopyrone has been developed from a com. available derivative of D-galactose. Key steps in the synthesis are a highly stereoselective pyranose chain-extension based on methyltitanium, preparation of a vinyl glycoside via Isobe C-alkynylation-rearrangement/reduction, and RCM-based pyranopyran construction. Crystallog. and NMR anal. confirms an earlier report that the structure originally proposed for diplopyrone may require revision. Structural analogs were prepared for biol. evaluation, the most promising being a pyranopyran nitrile synthesized from tri-O-acetyl-D-galactal by Ferrier cyanoglycosidation, Wittig chain extension, and lactonization. Biol. assays revealed potent antibacterial activity for the nitrile analog against common bacterial pathogens Edwardsiella ictaluri and Flavobacterium columnare that cause enteric septicemia (ESC) and columnaris disease, resp., in catfish. The IC50 value of 0.002 against E. ictaluri indicates approx. 100 times greater potency than the antibiotic florfenicol used com. for this disease. Phytotoxic activity for all three target compounds against duckweed was also observed The antibiotic and phytotoxic activities of the new pyranopyrans synthesized in this study demonstrate the potential of such compounds as antibiotics and herbicides.

Journal of Organic Chemistry published new progress about Alkynylation. 4098-06-0 belongs to class esters-buliding-blocks, and the molecular formula is C12H16O7, Reference of 4098-06-0.

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