Month: December 2022

Tang, Xinde published the artcileControlled grafting of ethyl cellulose with azobenzene-containing polymethacrylates via atom transfer radical polymerization, HPLC of Formula: 135529-02-1, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2007), 45(9), 1653-1660, database is CAplus.

Graft copolymers of Et cellulose with azobenzene-containing polymethacrylates were synthesized through atom transfer radical polymerization (ATRP). The residual hydroxyl groups on Et cellulose were first esterified with 2-bromoisobutyryl bromide to yield 2-bromoisobutyryloxy groups, which was then used to initiate the polymerization of 6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate (MMAzo) in the presence of CuBr/N,N,N’,N”,N”-pentamethylenetriamine (PMDETA) as catalyst and anisole as solvent. The graft copolymers were characterized by gel permeation chromatog. (GPC) and ¹H-NMR. The mol. weights of the graft copolymers increased relatively to the macroinitiator, and the polydispersities were narrow. The thermal and liquid crystalline property of the graft copolymers were studied by differential scanning calorimeter (DSC) and polarizing optical microscope (POM). Photoresponsive property was studied under the irradiation of UV-Vis light in THF solution The graft copolymers have potential applications, including sensors and optical materials.

Journal of Polymer Science, Part A: 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 C5H7NO, HPLC of Formula: 135529-02-1.

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

Tang, Xinde published the artcileEffect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers via atom transfer radical polymerization, Safety of 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2007), 45(22), 5190-5198, database is CAplus.

The effect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers was studied. For this study, three kinds of azobenzene-containing monomers with different terminal substituents-6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate, 6-[4-(4-ethoxyphenylazo)phenoxy]hexyl methacrylate, and 6-[4-(4-nitrophenylazo)phenoxy]hexyl methacrylate-were used to synthesize ABA triblock copolymers PMMAzo₂₅-PEG₁₃-PMMAzo₂₅/PMMAzo₁₂-PEG₁₃-PMMAzo₁₂, PEMAzo₁₄-PEG₁₃-PEMAzo₁₄, and PNMAzo₁₄-PEG₁₃-PNMAzo₁₄, resp., by atom transfer radical polymerization (PMMAzo is poly{6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate}, PEMAzo is poly{6-[4-(4-ethoxyphenylazo)phenoxy]hexyl methacrylate}, and PNMAzo is poly{6-[4-(4-nitrophenylazo)phenoxy]hexyl methacrylate}). These copolymers were characterized with ¹H NMR spectroscopy and gel permeation chromatog. and exhibited controlled mol. weights and narrow mol. weight distributions. Differential scanning calorimetry and polarizing optical microscopy showed that these copolymers had mesophases. PMMAzo₂₅-PEG₁₃-PMMAzo₂₅ and PMMAzo₁₂-PEG₁₃-PMMAzo₁₂ had a smectic mesophase and a nematic mesophase, whereas both PEMAzo₁₄-PEG₁₃-PEMAzo₁₄ and PNMAzo₁₄-PEG₁₃-PNMAzo₁₄ had a nematic mesophase. This demonstrated that the liquid-crystalline properties of these copolymers highly depended on the terminal substituent of azobenzene. The photoresponsive behavior of these copolymers was also studied in THF solutions, and the influence of the terminal substituents attached to azobenzene was studied.

Journal of Polymer Science, Part A: 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 C14H18BNO2S, Safety of 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate.

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

Zhi, Ying published the artcile4-Quinolone-3-carboxylic acids as cell-permeable inhibitors of protein tyrosine phosphatase 1B, Name: Ethyl 3-(dimethylamino)acrylate, the publication is Bioorganic & Medicinal Chemistry (2014), 22(14), 3670-3683, database is CAplus and MEDLINE.

Protein tyrosine phosphatase 1B is a neg. regulator in the insulin and leptin signaling pathways, and has emerged as an attractive target for the treatment of type 2 diabetes and obesity. However, the essential pharmacophore of charged phosphotyrosine or its mimetic confer low selectivity and poor cell permeability. Starting from the previously reported aryl diketoacid-based PTP1B inhibitors, a drug-like scaffold of 4-quinolone-3-carboxylic acid was introduced for the first time as a novel surrogate of phosphotyrosine. An optimal combination of hydrophobic groups installed at C-6, N-1 and C-3 positions of the quinolone motif afforded potent PTP1B inhibitors with low micromolar IC₅₀ values. These 4-quinolone-3-carboxylate based PTP1B inhibitors displayed a 2-10-fold selectivity over a panel of PTP’s. Furthermore, the bidentate inhibitors of 4-quinolone-3-carboxylic acids conjugated with aryl diketoacid or salicylic acid were cell permeable and enhanced insulin signaling in CHO/hIR cells. The kinetic studies and mol. modeling suggest that the 4-quinolone-3-carboxylates act as competitive inhibitors by binding to the PTP1B active site in the WPD loop closed conformation. Taken together, the study shows that the 4-quinolone-3-carboxylic acid derivatives exhibit improved pharmacol. properties over previously described PTB1B inhibitors and warrant further preclin. studies.

Bioorganic & Medicinal Chemistry 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 C13H10N2S, Name: Ethyl 3-(dimethylamino)acrylate.

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

Wang, Xiance published the artcileEvaluation of a photo-initiated copper(I)-catalyzed azide-alkyne cycloaddition polymer network with improved water stability and high mechanical performance as an ester-free dental restorative, COA of Formula: C11H15NO2, the publication is Dental Materials (2021), 37(10), 1592-1600, database is CAplus and MEDLINE.

The objective is to develop and characterize an ester-free ether-based photo-CuAAC resin with high mech. performance, low polymerization-induced stress compared with common BisGMA/TEGDMA (70/30) resins, and improved water stability in comparison to previously developed urethane-based photo-CuAAC resins.Triphenyl-ethane-centered ether-linked tri-azide monomers were synthesized and co-photopolymerized with ether-linked tri-alkyne monomers under visible light irradiation using a copper(II) pre-catalyst and CQ/EDAB as the initiator. The ether-based CuAAC formulation was investigated for thermo-mech. properties, polymerization kinetics and shrinkage stress, and flexural properties with respect to a conventional BisGMA/TEGDMA (70/30) dental resin. In addition, both the ether-based CuAAC resin and the urethane-based CuAAC resin were examined for their water stability using the BisGMA/TEGDMA (70/30) resin as a control.The ether-based CuAAC network (AK/AZ-1) exhibited a slightly lower glass-transition temperature compared with the BisGMA/TEGDMA network (108 °C vs 128 °C), but because of its much sharper glass transition, the AK/AZ-1 CuAAC-network maintained storage modulus higher than 1 GPa up to 100 °C. In addition, the ether-based AK/AZ-1 network exhibited reduced shrinkage stress (0.56 MPa vs 1.0 MPa) and much higher flexural toughness (7.6 MJ/m³ vs 1.6 MJ/m³ ) while showing slightly lower flexural modulus and slightly higher flexural strength compared with the BisGMA/TEGDMA network. Moreover, the ether-based AK/AZ-1 CuAAC network displayed comparable water stability in comparison to the BisGMA/TEGDMA network with slightly higher water sorption (46 Μg/mm³ vs 38 Μg/mm³ ) and much lower water solubility (2.3 Μg/mm³ vs 4.4 Μg/mm³ ).Employing the ether-based hydrophobic CuAAC formulation significantly improved the water stability of the CuAAC network compared with previously developed urethane-based CuAAC networks. Furthermore, compared with the conventionally used BisGMA/TEGDMA formulation, the reduced shrinkage stress, comparable flexural strength/flexural modulus, and the superior flexural toughness of the ether-based CuAAC network make it a promising ester-free alternative to the currently widely-used methacrylate-based dental restoratives.

Dental Materials 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 C15H20N2O2, COA of Formula: C11H15NO2.

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

Brown, Herbert C. published the artcileDicyclohexyliodoborane/triethylamine – a new reagent which achieves the facile enolboration of esters and tertiary amides, Application In Synthesis of 5340-78-3, the publication is Tetrahedron Letters (1992), 33(24), 3421-4, database is CAplus.

A smooth, rapid, quant. enolboration of esters and tertiary amides was achieved for the first time with dicyclohexyliodoborane, Chx₂BI, a new reagent, in the presence of triethylamine. E.g., treating EtCO₂Et with Chx₂BI and Et₃N in CCl₄ gave 96% (Z)-MeCH:C(OEt)OBChx₂, whereas EtCONMe₂ gave 96% (E)-MeCH:C(NMe₂)OBChx₂.

Tetrahedron Letters published new progress about 5340-78-3. 5340-78-3 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is Ethyltert-butylacetate, and the molecular formula is C8H16O2, Application In Synthesis of 5340-78-3.

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

Chapke, Krushna published the artcileMigration study of chemical additives from low density polyethylene (LDPE) into dahi, Recommanded Product: Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Journal of Food Science and Technology (New Delhi, India) (2022), 59(8), 3283-3295, database is CAplus and MEDLINE.

Dahi is widely used fermented milk product in India. Low D. Polyethylene (LDPE) is the most extensively used packaging material for Dahi in India. The present study was conducted to develop the anal. methods for extraction and migration of chem. additives from LDPE into dahi. Characterization of dahi packaging materials collected from five different firms was done by Fourier Transform IR Spectroscopy. Focused ultrasound solid liquid extraction method was observed to be better as compared to solid liquid extraction method as the former extracted maximum additives from the LDPE. Out of total 76 chem. additives extracted from LDPE, only eight (10.52%) matched with the existing pos. list of polyolefins prescribed by Bureau of Indian Standads (BIS). The overall migration of chem. additives from all the LDPE samples was below their maximum limit as given by BIS standards Chem. additives which migrated into the simulants included the antioxidants, fatty acids and their derivatives, unreacted hydrocarbons, plasticizers, lubricants and surfactant, etc.

Journal of Food Science and Technology (New Delhi, India) published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Recommanded Product: Tris(2,4-di-tert-butylphenyl) phosphite.

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

Dominguez, Eduardo published the artcileIntegrated phenotypic and activity-based profiling links Ces3 to obesity and diabetes, Application In Synthesis of 50670-76-3, the publication is Nature Chemical Biology (2014), 10(2), 113-121, database is CAplus and MEDLINE.

Phenotypic screening is making a comeback in drug discovery as the maturation of chem. proteomics methods has facilitated target identification for bioactive small mols. A limitation of these approaches is that time-consuming genetic methods or other means are often required to determine the biol. relevant target (or targets) from among multiple protein-compound interactions that are typically detected. Here, the authors have combined phenotypic screening of a directed small-mol. library with competitive activity-based protein profiling to map and functionally characterize the targets of screening hits. Using this approach, the authors identify carboxylesterase 3 (Ces3, also known as Ces1d) as a primary mol. target of bioactive compounds that promote lipid storage in adipocytes. The authors further show that Ces3 activity is markedly elevated during adipocyte differentiation. Treatment of two mouse models of obesity-diabetes with a Ces3 inhibitor ameliorates multiple features of metabolic syndrome, illustrating the power of the described strategy to accelerate the identification and pharmacol. validation of new therapeutic targets.

Nature Chemical Biology published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Application In Synthesis of 50670-76-3.

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

Diebold, Martin published the artcileImmunological Predictors of Dimethyl Fumarate-Induced Lymphopenia, Product Details of C6H8O4, the publication is Annals of Neurology (2022), 91(5), 676-681, database is CAplus and MEDLINE.

Treatment with di-Me fumarate (DMF) leads to lymphopenia and infectious complications in a subset of patients with multiple sclerosis (MS). Here, we aimed to reveal immune markers of DMF-associated lymphopenia. This prospective observational study longitudinally assessed 31 individuals with MS by single-cell mass cytometry before and after 12 and 48 wk of DMF therapy. Employing a neural network-based representation learning approach, we identified a CCR4-expressing T helper cell population neg. associated with relevant lymphopenia. CCR4-expressing T helper cells represent a candidate prognostic biomarker for the development of relevant lymphopenia in patients undergoing DMF treatment.

Annals of Neurology 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, Product Details of C6H8O4.

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

Diebold, Martin published the artcileHigh-dimensional immune profiling identifies a biomarker to monitor dimethyl fumarate response in multiple sclerosis, Computed Properties of 624-49-7, the publication is Proceedings of the National Academy of Sciences of the United States of America (2022), 119(31), e2205042119, database is CAplus and MEDLINE.

Di-Me fumarate (DMF) is an immunomodulatory treatment for multiple sclerosis (MS). Despite its wide clin. use, the mechanisms underlying clin. response are not understood. This study aimed to reveal immune markers of therapeutic response to DMF treatment in MS. For this purpose, we prospectively collected peripheral blood mononuclear cells (PBMCs) from a highly characterized cohort of 44 individuals with MS before and at 12 and 48 wk of DMF treatment. Single cells were profiled using high-dimensional mass cytometry. To capture the heterogeneity of different immune subsets, we adopted a bioinformatic multipanel approach that allowed cell population-cluster assignment of more than 50 different parameters, including lineage and activation markers as well as chemokine receptors and cytokines. Data were further analyzed in a semiunbiased fashion implementing a supervised representation learning approach to capture subtle longitudinal immune changes characteristic for therapy response. With this approach, we identified a population of memory T helper cells expressing high levels of neuroinflammatory cytokines (granulocyte-macrophage colony-stimulating factor [GM-CSF], interferon γ [IFNγ]) as well as CXCR3, whose abundance correlated with treatment response. Using spectral flow cytometry, we confirmed these findings in a second cohort of patients. Serum neurofilament light-chain levels confirmed the correlation of this immune cell signature with axonal damage. The identified cell population is expanded in peripheral blood under natalizumab treatment, substantiating a specific role in treatment response. We propose that depletion of GM-CSF-, IFNγ-, and CXCR3-expressing T helper cells is the main mechanism of action of DMF and allows monitoring of treatment response.

Proceedings of the National Academy of Sciences of the United States of America 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, Computed Properties of 624-49-7.

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

Westphal, Eduard published the artcileLiquid crystalline self-assembly of 2,5-diphenyl-1,3,4-oxadiazole based bent-core molecules and the influence of carbosilane end-groups, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2019), 7(10), 3064-3081, database is CAplus.

Bent-core liquid crystals (BCLCs) exhibit unique properties like spontaneous breaking of the mirror symmetry and polar switching by elec. fields, forming the basis of a range of applications currently being developed. Here we report first 2,5-diphenyl-1,3,4-oxadiazole based BCLCs with carbosilane end groups. Their self-assembly in liquid crystalline (LC) phases was investigated by polarizing microscopy, differential scanning calorimetry, X-ray diffraction, electro-optical and dielec. investigations and was compared with a related non-silylated compound A transition from non-modulated via modulated synclinic SmC phases to optically almost isotropic sponge phases was observed with growing packing d. upon lowering temperature, which was investigated in the bulk state as well as in freely suspended films. In the SmC phases of both series the polar order is only local, leading to polarization randomized paraelec. and superparaelec. phases. Development of macroscopic polar order leads to the formation of polarization modulated smectic phases with oblique lattice, followed by optically isotropic LC phases with grainy and sponge-like 3d modulated layers, and finally isotropic crystalline phases. The silylated and non-silylated 1,3,4-oxadiazole based BCLCs have almost identical phase sequences differing mainly in details of the switching characteristics and in the structure of the optically isotropic low temperature LC phases, being achiral with a local SmC_sP_A structure for the silylated compounds and chiral with a local SmC_aP_A structure if non-silylated. Elongation of the bent core unit of the silylated oxadiazoles favors synpolar order, leading to a ferroelec. LC phase, while 3d layer distortion is suppressed. Overall, this work provides a general understanding of the LC phase sequences of the important class of 1,3,4-oxadiazole based BCLCs and of the nature of the distinct types of achiral and mirror-symmetry broken chiral (dark conglomerate type) isotropic LC phases in general.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H21BO3, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

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