cas 23778-52-1, PENTAETHYLENE GLYCOL MONOMETHYL ETHER

Articles about 23778-52-1Total 18 be found

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Engineering Nanoparticulate Organic Photocatalysts via a Scalable Flash Nanoprecipitation Process for Efficient Hydrogen Production
Directly converting sunlight into hydrogen fuels using particulate photocatalysts represents a sustainable route for clean energy supply. Organic semiconductors have emerged as attractive candidates but always suffer from optical and exciton recombination losses with large exciton “dead zone” inside the bulk material, severely limiting the catalytic performance. Herein, we demonstrate a facile strategy that combines a scalable flash nanoprecipitation (FNP) method with hydrophilic soluble polymers (PC-PEG5 and PS-PEG5) to prepare highly efficient nanosized photocatalysts without using surfactants. Significantly, a 70-fold enhancement of hydrogen evolution rate (HER) is achieved for nanosized PC-PEG5, and the FNP-processed PS-PEG5 shows a peak HER rate of up to 37.2 mmol h?1 g?1 under full-spectrum sunlight irradiation, which is among the highest results for polymer photocatalysts. A scaling-up production of nanocatalyst is demonstrated with the continuously operational FNP.
Guo, Zhiqian,Wu, Yongzhen,Yu, Miaojie,Zhang, Weiwei,Zhu, Weihong
p. 15590 - 15597
(2021)
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Hybrids of Small-Molecule CD4 Mimics with Polyethylene Glycol Units as HIV Entry Inhibitors
CD4 mimics are small molecules that inhibit the interaction of gp120 with CD4. We have developed several CD4 mimics. Herein, hybrid molecules consisting of CD4 mimics with a long alkyl chain or a PEG unit attached through a self-cleavable linker were synthesized. In anti-HIV activity, modification with a PEG unit appeared to be more suitable than modification with a long alkyl chain. Thus, hybrid molecules of CD4 mimics, with PEG units attached through an uncleavable linker, were developed and showed high anti-HIV activity and low cytotoxicity. In investigation of pharmacokinetics in a rhesus macaque, a hybrid compound had a more effective PK profile than that of the parent compound, and intramuscular injection was a more useful administration route to maintain the high blood concentration of the CD4 mimic than intravenous injection. The presented hybrid molecules of CD4 mimics with a PEG unit would be practically useful when combined with a neutralizing antibody.
Kobayakawa, Takuya,Tsuji, Kohei,Konno, Kiju,Himeno, Ai,Masuda, Ami,Yang, Tingting,Takahashi, Kohei,Ishida, Yusuke,Ohashi, Nami,Kuwata, Takeo,Matsumoto, Kaho,Yoshimura, Kazuhisa,Sakawaki, Hiromi,Miura, Tomoyuki,Harada, Shigeyoshi,Matsushita, Shuzo,Tamamura, Hirokazu
p. 1481 - 1496
(2021/02/27)

Designing Nonfullerene Acceptors with Oligo(Ethylene Glycol) Side Chains: Unraveling the Origin of Increased Open-Circuit Voltage and Balanced Charge Carrier Mobilities
Despite the recent rapid development of organic solar cells (OSCs), the low dielectric constant (?r=3–4) of organic semiconducting materials limits their performance lower than inorganic and perovskite solar cells. In this work, we introduce oligo(ethylene glycol) (OEG) side chains into the dicyanodistyrylbenzene-based non-fullerene acceptors (NIDCS) to increase its ?r up to 5.4. In particular, a NIDCS acceptor bearing two triethylene glycol chains (NIDCS-EO3) shows VOC as high as 1.12 V in an OSC device with a polymer donor PTB7, which is attributed to reduced exciton binding energy of the blend film. Also, the larger size grain formation with well-ordered stacking structure of the NIDCS-EO3 blend film leads to the increased charge mobility and thus to the improved charge mobility balance, resulting in higher JSC, FF, and PCE in the OSC device compared to those of a device using the hexyl chain-based NIDCS acceptor (NIDCS-HO). Finally, we fabricate NIDCS-EO3 devices with various commercial donors including P3HT, DTS-F, and PCE11 to show higher photovoltaic performance than the NIDCS-HO devices, suggesting versatility of NIDCS-EO3.
Cui, Junjie,Park, Jung-Hwa,Kim, Dong Won,Choi, Min-Woo,Chung, Hae Yeon,Kwon, Oh Kyu,Kwon, Ji Eon,Park, Soo Young
p. 2481 - 2488
(2021/07/26)

Enzyme-Mediated Directional Transport of a Small-Molecule Walker with Chemically Identical Feet
We describe a small-molecule "walker" that uses enzyme catalysis to discriminate between the relative positions of its "feet" on a track and thereby move with net directionality. The bipedal walker has identical carboxylic acid feet, and "steps" along an isotactic hydroxyl-group-derivatized polyether track by the formation/breakage of ester linkages. Lipase AS catalyzes the selective hydrolysis of the rear foot of macrocyclized walkers (an information ratchet mechanism), the rear foot producing an (R)-stereocenter at its point of attachment to the track. If the hydrolyzed foot reattaches to the track in front of the bound foot it forms an (S)-stereocenter, which is resistant to enzymatic hydrolysis. Only macrocyclic walker-track conjugates are efficiently hydrolyzed by the enzyme, leading to high processivity of the walker movement along the track. Conventional chemical reagents promote formation of the ester bonds between the walker and the track. Iterative macrocyclization and hydrolysis reactions lead to 68% of walkers taking two steps directionally along a three-foothold track.
Martin, Christopher J.,Lee, Alan T. L.,Adams, Ralph W.,Leigh, David A.
supporting information
p. 11998 - 112002
(2017/09/07)

Gold nanoparticles generated by thermolysis of "all-in-one" gold(i) carboxylate complexes
Consecutive synthesis methodologies for the preparation of the gold(i) carboxylates [(Ph3P)AuO2CCH2(OCH 2CH2)nOCH3] (n = 0-6) (6a-g) are reported, whereby selective mono-alkylation of diols HO(CH2CH 2O)nH (n = 0-6), Williamson ether synthesis and metal carboxylate (Ag, Au) formation are the key steps. Single crystal X-ray diffraction studies of 6a (n = 0) and 6b (n = 1) were carried out showing that the P-Au-O unit is essentially linear. These compounds were applied in the formation of gold nanoparticles (NP) by a thermally induced decomposition process and hence the addition of any further stabilizing and reducing reagents, respectively, is not required. The ethylene glycol functionalities, providing multiple donating capabilities, are able to stabilise the encapsulated gold colloids. The dependency of concentration, generation time and ethylene glycol chain lengths on the NP size and size distribution is discussed. Characterisation of the gold colloids was performed by TEM, UV/Vis spectroscopy and electron diffraction studies revealing that Au NP are formed with a size of 3.3 (±0.6) to 6.5 (±0.9) nm in p-xylene with a sharp size distribution. Additionally, a decomposition mechanism determined by TG-MS coupling experiments of the gold(i) precursors is reported showing that 1 st decarboxylation occurs followed by the cleavage of the Au-PPh 3 bond and finally release of ethylene glycol fragments to give Au-NP and the appropriate organics. The Royal Society of Chemistry 2012.
Tuchscherer,Schaarschmidt,Schulze,Hietschold,Lang
scheme or table
p. 2738 - 2746
(2012/04/10)

Doubly activated supramolecular reaction: Transesterification of acyclic oligoether esters with metal alkoxides
Transesterification reactions of acyclic oligoether esters E3-E10 with metal alkoxides were accelerated upon noncovalent complexation of the esters with metal ions. In the reaction of monovalent alkaline metal alkoxides, CH3ONa and CH3OK, plots of the observed rate constants kobs with respect to the chain length of E3-E10 showed selective acceleration of the transesterification. Compared with the shortest E3, which can hardly bind metal ion, 4.3- and 6.6-fold accelerations in the maxima were achieved in the combinations of E5/CH3ONa and E6/CH3OK, respectively. Supramolecular intermediate complex could be spectrometrically visualized by ESI-FT-ICR-MS in the course of reaction. Kinetic experiments, together with structural analyses by means of NMR, mass spectrometry, and DFT calculations of the intermediate complexes, indicate that a size-fit complex of host substitute with alkali metal ion allows strong electron withdrawing due to the close contact of the carbonyl oxygen to the metal ion, resulting in the selective rate enhancement of the reaction, while in the reaction of E3-E10 with a divalent alkaline earth metal alkoxide, (CH3- CH2O)2Ba, the kobs values increased stepwise with elongation of the side arm to attain an dramatic large acceleration. In comparison with the kobs of E3, 4610-fold acceleration was achieved in the reaction of E10. The double activation of the host substrate and guest counter nucleophile at once brings about this extraordinary rate acceleration. The strong wrapping complexation of long oligoether ester with barium ethoxide allows for the effective electron withdrawal from the ester carbonyl group (host activation) as well as separation of the accompanying guest alkoxide anions (guest activation).
Kawakami, Kazumitsu,Sei, Yoshihisa,Yamaguchi, Kentaro,Tsuda, Akihiko
supporting information; scheme or table
p. 875 - 881
(2011/04/18)

Polyethylene glycol-based homologated ligands for nicotinic acetylcholine receptors
A homologous series of polyethylene glycol (PEG) monomethyl ethers were conjugated with three ligand series for nicotinic acetylcholine receptors. Conjugates of acetylaminocholine, the cyclic analog 1-acetyl-4,4-dimethylpiperazinium, and pyridyl ether A-84543 were prepared. Each series was found to retain significant affinity at nicotinic receptors in rat cerebral cortex with tethers of up to six PEG units. Such compounds are hydrophilic ligands which may serve as models for fluorescent/affinity probes and multivalent ligands for nAChR.
Scates, Bradley A.,Lashbrook, Bethany L.,Chastain, Benjamin C.,Tominaga, Kaoru,Elliott, Brandon T.,Theising, Nicholas J.,Baker, Thomas A.,Fitch, Richard W.
supporting information; experimental part
p. 10295 - 10300
(2009/04/12)

Effects of hydration on the thermodynamic properties of aqueous ethylene glycol ether solutions
The densities and isobaric specific heat capacities of binary mixtures of water with various open-chain and cyclic ethylene glycol ethers have been measured at 298.15 K using vibrating tube densimetry, and flow or differential scanning calorimetry, respectively. Excess molar volumes were derived over the whole composition range. Molar isobaric heat capacities and the relative apparent thermodynamic quantities were determined in the water-rich region. The data reflect the changes in the structure and hydrogen-bond dynamics of water caused by these non-ionic solutes. The observed effects are discussed in terms of the influence of hydrophobic hydration on the thermodynamic properties of aqueous solutions. Correlations are given that enable the prediction of the thermodynamic properties of open-chain and cyclic oligo(ethylene oxide) ethers in their pure liquid state and at infinite dilution in water.
Schroedle, Simon,Hefter, Glenn,Buchner, Richard
p. 513 - 522
(2008/02/02)

Chemically modified small molecules
The invention provides small molecule drugs that are chemically modified by covalent attachment of a water-soluble oligomer obtained from a monodisperse or bimodal water-soluble oligomer composition. A conjugate of the invention, when administered by any of a number of administration routes, exhibits a reduced biological membrane crossing rate as compared to the biological membrane crossing rate of the small molecule drug not attached to the water-soluble oligomer.
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(2010/02/12)

Synthesis of thermosensitive water-soluble polystyrenics with pendant methoxyoligo(ethylene glycol) groups by nitroxide-mediated radical polymerization
Nitroxide-mediated radical polymerizations of 4-vinylbenzyl methoxytris(oxyethylene) ether (TEGSt), 4-vinylbenzyl methoxytetrakis(oxyethylene) ether (TrEGSt), and 4-vinylbenzyl methoxypentakis-(oxyethylene) ether (PEGSt) were carried out at 120°C using 2,2,5-trimethyl-3-(1-phenylethoxy)-4-phenyl-3-azahexane as initiator. Kinetics study and gel permeation chromatography analysis showed that the polymerizations were living processes yielding polymers with controlled molecular weights and narrow molecular weight distributions. The polymers can be dissolved in water forming transparent solutions and undergo phase transitions when the temperature is above a critical point. The cloud points of the homopolymers of TEGSt, TrEGSt, and PEGSt were around 13, 39, and 55°C, respectively, which were also supported by variable temperature 1H NMR spectroscopy analysis. The high level of alkoxyamine chain end retention allowed the synthesis of diblock copolymers with low polydispersities (1H NMR studies indicated that the diblock copolymers undergo phase transition in water at a temperature between the cloud points of the two corresponding homopolymers.
Zhao, Bin,Li, Dejin,Hua, Fengjun,Green, Derrick R.
p. 9509 - 9517
(2008/02/01)

1H NMR spectral evidence for a specific host-guest complexation induced charge localization in squaraine dyes
(Chemical Equation Presented) Experimental support is provided for the charge localization in squaraines, a class of fundamentally and technologically important organic dyes, by 1H NMR analysis through a host-guest complexation approach. Specific binding of Ca2+ ions to the squaraine 2 with a podand sidearm resulted in a charge-localized structure 2a with dramatic shifts and resolution of the proton signals when compared to those of 2.
Ajayaghosh, Ayyappanpillai,Arunkumar, Easwaran
p. 3135 - 3138
(2007/10/03)

Synthesis and characterization of network type single ion conductors
New single ion conductors were synthesized by grafting the allyl group-containing lithium salt, lithium bis(allylmalonato)borate (LiBAMB), onto allyl group-containing comb-branch polyacrylate or polymethacrylate ethers by means of hydrosilylation. The highest ambient temperature conductivity of 3.5 × 10-7 S cm-1 was obtained for a polyacrylate ether-based single ion conductor containing eight EO units in the side chain and five EO units in the cross-linking side chain, to which the anion was fixed with a salt concentration of EO/Li = 20. For polyacrylate ether-based single ion conductors, an increase of chain length in both side chains and cross-linking anion chains favors an increase of ionic conductivity. The addition of 50 wt % EC/DMC (1/1, wt/wt) increased the ionic conductivity by more than 2 orders of magnitude due to both the increase in ionic mobility from the liquid phase and the increase in the concentration of free ions from the high dielectric constant of the solvent. The preliminary Li/Li cycling profiles of dry polyacrylate- and polymethacrylate ether-based single ion conductors are encouraging as almost no concentration polarization or relaxation was observed. The observed increase in cell potential with cycling is apparently due to an increase in the interfacial impedance associated with the SEI layer, and the cell failure is accompanied by the decomposition of the ester bond of the polyacrylate backbone.
Sun, Xiao-Guang,Reeder, Craig L.,Kerr, John B.
p. 2219 - 2227
(2007/10/03)

Investigations on the influence of 2'-O-alkyl modifications on the base pairing properties of oligonucleotides
The antisense strategy has gained wide acceptance as a promising drug development concept. Antisense drugs hybridize with selected complementary sequences in a highly specific manner. However, as a main prerequisite for extensive therapeutic use of this new class of drugs, selected structural modifications are required to adjust pharmacokinetic and pharmacodynamic behavior. In continuation of our earlier investigations on 2'-O-modified oligonucleotides (Gotten, M., Oberhauser, B., Brunar, H., Holzner, A., Issakides, G., Noe, C.R., Schaffer, G., Wagner, E., Bimstiel, M.L., 1991. 2'-O-methyl, 2'-O-ethyl oligoribonucleotides and phosphorothioate oligodeoxyribonucleotides as inhibitors of the in vitro U7 snRNP-dependent mRNA processing event. Nucleic Acids Res. 19, 2629-2635; Wagner, E., Oberhauser, B., Holzner, A., Brunar, H., Issakides, G., Schaffner, G., Gotten, M., Knollmuller, M., Noe, C.R., 1991. A simple procedure for the preparation of protected 2'-O-methyl or 2'-O-ethyl ribonucleoside-3'-O-phosphoramidites. Nucleic Acids Res. 19, 5965-5971) further series of modified oligonucleotides containing different modified 2'-O-adenosines have been synthesized. On the one hand linear alkyl moieties of increasing length, on the other hand oxyethylene moieties of corresponding length were introduced at the 2'-O-position of adenosine. Following another approach a cationic charge was introduced by insertion of an aminohexylmodification at the 2'-O-position of adenosine (Brunar, H., Haberhauer, G., Werner, D., Noe, C.R., 1994. 2'-O-Modified oligonucleotides: Synthesis and biophysical analysis. Eur. J. Pharm. Sci. 2, 150). Molecule dynamics simulations had shown that this cationic modification upon duplex formation leads to both intra- and interstrand interactions. To determine the influence of the different modifications, such as cationic charge, alkyl chainlength and introduction of oxygen into the chain, on duplex stability melting temperatures were measured by recording circular dichroism versus temperature.
Werner, Doris,Brunar, Helmut,Noe, Christian R.
p. 3 - 10
(2007/10/03)

Chelate complexes and processes for their preparation
Naphthalocyanine-chelate complexes of formula I STR1 are described which contain as central atom M aluminum, gallium, indium, fin, ruthenium or preferably germanium and in which the remaining symbols are as defined in claim 1. The complexes can be used inter alia in the photodynamic chemotherapy of tumors.
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(2008/06/13)

Synthesis and Characterization of New Polyethyleneoxy Substituted Salicylaldimine Schiff Bases and some corresponding Reduced Tetra- and Pentaaza Ligands Their Gadolinium (III) Complexes: New Potential Contrast Agents in Magnetic Resonance Imaging
A series of polyether substituted salicylaldehyde derivatives OHCC6H3OH-2-OR-3 have been synthesised and used to prepare the polydentate ligands HN2, HN2 and HN3; a preliminary evaluation has been made of the potential use of their gadolinium complexes as contrast agents for diagnostic Magnetic Resonance Imaging.
Kocian, Oldrich,Chiu, Kwok W.,Demeure, Roger,Gallez, Bernard,Jones, Christopher J.,Thornback, John R.
p. 527 - 536
(2007/10/02)

Synthesis of Monodisperse Perfluoroalkyl-Oxyethylene Surfactants with Methoxy Capping: Surfactants of High Chemical Inertness
Monodisperse fluoroalkyl non-ionic surfactants with a methoxy group capping the hydrophilic head, and having a high chemical inertness and surface properties typical of perfluorinated non-ionic surfactants, have been synthesized.
Selve, Claude,Achilefu, Samuel
p. 911 - 912
(2007/10/02)

AFFINITIES OF CROWN ETHERS, GLYMES, AND POLYAMINES FOR ALKALI PICRATES IN TOLUENE. APPLICATION OF POLYMER-SUPPORTED LINEAR POLYETHERS.
This work reports the measurements of K values for polyamines, glymes, a few glycols (including that of a long-chain polyethylene glycol, carbowax 6000), and some frequently used cation-binding ligands as complexers of lithium or sodium picrate in toluene as solvent. K values for different resins obtained with the same soluble ligand provide a comparison of the effectiveness of these resins in binding ionic solutes.
Xu,Smid
p. 3790 - 3796
(2007/10/02)

Hydrophilic Lipids
The new triesters of glycerol 1-8 with different oligoethylene glycol carboxylic acids ("hydrophilic lipids") have been synthesized and their complexation with alkali and alkaline earth metal cations has been investigated.
Heimann, Ulrich,Voegtle, Fritz
p. 858 - 862
(2007/10/02)

Chemical Properties

Boiling Point: 332.3 °C at 760 mmHg
Flash Point:154.7 °C
Density: 1.053g/cm³
Storage Temp.:-20°C
Vapor Pressure: 1.06E-05mmHg at 25°C
Refractive Index: 1.441
PKA: 14.36±0.10(Predicted)
PSA: 66.38000
LogP: -0.30850

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23778-52-1

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Chemical Properties

Boiling Point: 332.3 °C at 760 mmHg

Flash Point:154.7 °C

Density: 1.053g/cm³

Storage Temp.:-20°C

Vapor Pressure: 1.06E-05mmHg at 25°C

Refractive Index: 1.441

PKA: 14.36±0.10(Predicted)

PSA: 66.38000

LogP: -0.30850

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Article Database

23778-52-1

Articles about 23778-52-1Total 18 be found

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Chemical Properties

Boiling Point: 332.3 °C at 760 mmHg

Flash Point:154.7 °C

Density: 1.053g/cm3

Storage Temp.:-20°C

Vapor Pressure: 1.06E-05mmHg at 25°C

Refractive Index: 1.441

PKA: 14.36±0.10(Predicted)

PSA: 66.38000

LogP: -0.30850

Global suppliers and manufacturers of 23778-52-1total 54 suppliers on LookChem

Density: 1.053g/cm³