Month: October 2022

Jones, Brad H.; Staiger, Chad; Powers, Jackson; Herman, Jeremy A.; Roman-Kustas, Jessica published the artcile< Selectively Depolymerizable Polyurethanes from Unsaturated Polyols Cleavable by Olefin Metathesis>, COA of Formula: C4H8O, the main research area is selectively depolymerizable polyurethane unsaturated polyol cleavable olefin metathesis; cycloalkenes; depolymerization; olefin metathesis; polyurethanes; ring-closing metathesis.

This communication describes a novel series of linear and crosslinked polyurethanes (PUs) and their selective depolymerization under mild conditions. Two unique polyols are synthesized bearing unsaturated units in a configuration designed to favor ring-closing metathesis (RCM) to five- and six-membered cycloalkenes. These polyols are co-polymerized with toluene diisocyanate to generate linear PUs and trifunctional hexamethylene- and diphenylmethane-based isocyanates to generate crosslinked PUs. The polyol design is such that the RCM reaction cleaves the backbone of the polymer chain. Upon exposure to dilute solutions of Grubbs’ catalyst under ambient conditions, the PUs are rapidly depolymerized to low mol. weight, soluble products bearing vinyl and cycloalkene functionalities. These functionalities enable further re-polymerization by traditional strategies for polymerization of double bonds. It is anticipated that this general approach can be expanded to develop a range of chem. recyclable condensation polymers that are readily depolymerized by orthogonal metathesis chem.

Macromolecular Rapid Communications published new progress about Depolymerization. 627-27-0 belongs to class alcohols-buliding-blocks, and the molecular formula is C4H8O, COA of Formula: C4H8O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ashrafizadeh, Milad; Ahmadi, Zahra; Farkhondeh, Tahereh; Samarghandian, Saeed published the artcile< Resveratrol targeting the Wnt signaling pathway: A focus on therapeutic activities>, Product Details of C14H12O3, the main research area is Wnt signaling pathway; cancer therapy; medicinal plants; resveratrol.

Wingless-type MMTV integration site (Wnt) signaling pathway is considered as an important pathway regulating a variety of biol. processes such as tissue formation and homeostasis, cell proliferation, cell migration, cell differentiation, and embryogenesis. Impairment in the Wnt signaling pathway is associated with pathol. conditions, particularly cancer. So, modulation of this pathway can be considered as a promising strategy and several drugs have been developed in line with this strategy. Resveratrol (Res) is a naturally occurring nutraceutical compound exclusively found in different fruits and nuts such as grape, peanut, and pistachio. This compound has favorable biol. and therapeutic activities such as antioxidant, anti-inflammatory, antitumor, hepatoprotective, cardioprotective, and antidiabetic. At the present review, we demonstrate how Res modulates Wnt signaling pathway to exert its pharmacol. effects.

Journal of Cellular Physiology published new progress about 501-36-0 . 501-36-0 belongs to class alcohols-buliding-blocks, and the molecular formula is C14H12O3, Product Details of C14H12O3.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hemmati, Saba; Hekmati, Malak; Salamat, Delafarin; Yousefi, Mohammad; Karmakar, Bikash; Veisi, Hojat published the artcile< Anchoring Mn(IV) in multi pyridine modified mesoporous silica SBA-15: An efficient nanocatalyst for selective oxidation of sulfides to sulfoxides>, Application In Synthesis of 699-12-7, the main research area is manganese melamine pyridine functionalized silica catalyst oxidation sulfide sulfoxide.

In this current study we report the implementation of Mn(IV) grafted multipyridine linked melanine functionalized SBA-15/CCPy/Mn(OAc)2 as a novel high surface area nanocatalyst. The melamine linked multipyridine ligand was introduced over mesoporous SBA-15 to ensure the strong chelation of Mn(OAc)2 in order to deploy as active site. The structural features of the so designed material were properly analyzed with SEM, TEM, EDX, ICP-AES and N2 adsorption-desorption isotherm techniques. Catalytic behavior of the nanocomposite was investigated in the chemoselective oxidation of sulfides to sulfoxides using H2O2 as a mild oxidant under solvent-free conditions at room temperature resulting very good yields. The catalyst was reused up to 8 consecutive cycles without significant leaching and reduced catalytic performance.

Polyhedron published new progress about Energy-dispersive x-ray spectra. 699-12-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H10OS, Application In Synthesis of 699-12-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kundu, Bidyut Kumar; Das, Mriganka; Ganguly, Rakesh; Bhobe, Preeti A.; Mukhopadhyay, Suman published the artcile< Role of zeolite encapsulated Cu(II) complexes in electron transfer as well as peroxy radical intermediates formation during oxidation of thioanisole>, Name: 2-(Phenylthio)ethanol, the main research area is copper complex encapsulated zeolite sulfoxidation catalyst; electron transfer copper complex encapsulated zeolite sulfoxidation catalyst; peroxy radical copper complex encapsulated zeolite sulfoxidation catalyst.

Zeolite encapsulated host-guest complexes [CuL(NO3)@Y], and [CuL2@Y] (where, HL is 1-[(3-dimethylamino-2,2-dimethyl-propylimino)-methyl]-naphthalen-2-ol, I) have been synthesized and characterized by XRD, FTIR, Raman, TEM, XPS, UV-DRS, BET, EXAFS, and EPR spectroscopy. These complexes were used as heterogeneous catalysts for the oxidation of thioanisole, di-Ph sulfide, and 2-phenylthioanisole to produce sulfoxides analogs. H2O2 shows superior conversion efficiency and product selectivity over other common oxidants, viz tert-Bu hydroperoxide (TBHP), urea hydrogen peroxide (UHP) and di-tert-Bu hydroperoxide (DTBP). Formation of thermally stable copper hydroperoxo intermediate, which is to be believed as rate determining step in past few years, has been well proven. Besides that, for the first time, we have established that the oxidation process is not only going through by the generation of Cu(II)-OOH species but there is a considerable role of electron transfer (ET) mechanism also. Further, better TON value and recyclability make the encapsuled heterogeneous complexes more useful than that of homogeneous analogs.

Journal of Catalysis published new progress about Crystal structure (of CuL(NO3) and CuL2 complexes). 699-12-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H10OS, Name: 2-(Phenylthio)ethanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Yuanhao; Gu, Fan; Ding, Bingbing; Zou, Lei; Ma, Xiang published the artcile< Photo-controllable room-temperature phosphorescence of organic photochromic polymers based on hexaarylbiimidazole>, Synthetic Route of 627-27-0, the main research area is amorphous polymer photochromism room temperature phosphorescence.

Pure organic room-temperature phosphorescent (RTP) materials have been attracting widespread attention due to the unique properties and broad applications. However, RTP materials with the adjustable photochromic property are still a challenge. Based on this, two polymers containing hexaarylbiimidazole are strategically designed with dual emission of both fluorescence and phosphorescence. Furthermore, both polymers show sensitive photochromic responses from faint yellow to brown upon exposure to UV light This study can enrich pure organic luminescent systems and provide new ideas for functional RTP materials.

Science China: Chemistry published new progress about Phosphorescence. 627-27-0 belongs to class alcohols-buliding-blocks, and the molecular formula is C4H8O, Synthetic Route of 627-27-0.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Yuan, Qin; He, Yuan; Xiang, Pan-Yin; Huang, Yue-Jia; Cao, Zheng-Wen; Shen, Si-Wei; Zhao, Li; Zhang, Qing; Qin, Wen; Wu, Ding-Tao published the artcile< Influences of different drying methods on the structural characteristics and multiple bioactivities of polysaccharides from okra (Abelmoschus esculentus)>, Reference of 3458-28-4, the main research area is Abelmoschus polysaccharide bioactivity drying; Antioxidant activity; Binding capacity; Drying method; Enzyme inhibition; Okra polysaccharide; Structural characteristic.

In this study, in order to evaluate the influences of drying methods on the chem. structures and bioactivities of polysaccharides from okra (OPPs), four drying methods, including microwave drying at 400 W, 600 W, and 800 W, freezing drying, hot air drying, and vacuum drying, were applied to dry okra fruits. Six different OPPs were extracted from okra dried by different drying methods. Results showed that physicochem. characteristics and bioactivities of OPPs varied by different drying methods. Noticeable variations in extraction yields, mol. weights, rheol. properties, molar ratios of constituent monosaccharides, contents of uronic acids, degrees of esterification, and contents of total phenolics were observed in OPPs obtained by different drying methods. In addition, results showed that OPPs, especially OPP-H and OPP-V obtained by hot air drying and vacuum drying, resp., exhibited remarkable antioxidant activities (ABTS, DPPH, and nitric oxide radical scavenging activities, and ferric reducing antioxidant powers), strong in vitro binding capacities (fat, cholesterol, and bile acids binding capacities), and obvious inhibitory activities on α-amylase and α-glucosidase. Results suggested that the hot air and vacuum drying techniques could be appropriate drying methods before extraction of OPPs with high bioactivities for applications in the functional food and medicine industries.

International Journal of Biological Macromolecules published new progress about Abelmoschus esculentus. 3458-28-4 belongs to class alcohols-buliding-blocks, and the molecular formula is C6H12O6, Reference of 3458-28-4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Saveliev, Anatoly A.; Galeeva, Ekaterina V.; Semanov, Dmitry A.; Galeev, Roman R.; Aryslanov, Ilshat R.; Falaleeva, Tatyana S.; Davletshin, Rustam R. published the artcile< Adaptive noise model based iteratively reweighted penalized least squares for fluorescence background subtraction from Raman spectra>, Reference of 1492-18-8, the main research area is ANM IRPLS math model fluorescence Raman spectroscopy.

The spectral anal. depends heavily on unwanted signals, such as the fluorescent background from the samples or other interfering components. A number of math. algorithms have been proposed to remove the background of Raman spectra. However, these methods require the selection of appropriate parameters to correct the of Raman spectra baseline. In this paper, we propose a method of adaptive noise model based on iteratively reweighted penalized least squares (ANM-IRPLS) for Raman spectrum baseline correction. The algorithm was applied to various artificial spectra containing real forms of baselines and characteristic Raman peaks and then to the spectra of real drug samples with fluorescence obtained on a device equipped with a 532-nm laser with a resolution of 15 cm-1. The modeling results showed that the proposed ANM-IRPLS baseline correction method allows for better results in background removal than the airPLS. For real Raman spectra processed by the ANM-IRPLS method, it is shown that the algorithm handles a complex background well, while maintaining the characteristic Raman signal features, such as a wide water peak for aqueous solutions

Journal of Raman Spectroscopy published new progress about Algorithm. 1492-18-8 belongs to class alcohols-buliding-blocks, and the molecular formula is C20H21CaN7O7, Reference of 1492-18-8.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wang, Jianqun; Zhu, Yinuo; Li, Maosheng; Wang, Yanchao; Wang, Xianhong; Tao, Youhua published the artcile< Tug-of-War between Two Distinct Catalytic Sites Enables Fast and Selective Ring-Opening Copolymerizations>, HPLC of Formula: 627-27-0, the main research area is epoxide anhydride ring opening copolymerization thiourea boron catalyst; Differentiated Catalytic Sites; Organocatalysts; Polyester; Ring-Opening Copolymerizations; Tug-of-War.

Ring-opening copolymerizations have emerged as a powerful approach towards the creation of sustainable polymers. Typical H-bonding catalysts for ring-opening are subject to a single catalytic site. Here we describe a H-bond-donor/Lewis-acidic-boron organocatalyst featuring two distinct catalytic sites in one mol. The ring-opening copolymerization of epoxides with anhydride mediated by these modular, and tunable catalysts achieves high selectivity (>99% polyester selectivity) and markedly higher activity compared to either of the di-thiourea analogs or any combinations of them. Calculations and exptl. studies reveal that the superior catalytic performance arises from tug-of-war between two differentiated catalytic sites: thiourea pulls off the propagating chain-end from boron center, simultaneously enhancing the role of monomer activation and also nucleophilicity of the propagation intermediates.

Angewandte Chemie, International Edition published new progress about Crystal structure. 627-27-0 belongs to class alcohols-buliding-blocks, and the molecular formula is C4H8O, HPLC of Formula: 627-27-0.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kamatsuka, Takuto; Shinokubo, Hiroshi; Miyake, Yoshihiro published the artcile< Design and synthesis of tunable ligands with 4,4'-bipyridyl as an electron-accepting unit and their rhenium complexes>, Electric Literature of 660867-80-1, the main research area is rhenium bipyridine pendant amine phosphine complex preparation reduction catalyst; carbon dioxide reduction photocatalyst rhenium bipyridine carbonyl complex; crystal structure rhenium bipyridine pendant amine complex; mol structure rhenium bipyridine pendant amine complex.

We have designed and prepared a series of rhenium complexes with 4,4′-bipyridyl, [(2-R1-6-R2-2′-CH2Q-4,4′-bpy)ReCl(CO)3] (2a-i, Q = NEt2, PtBu2, POtBu2; R1, R2 = H, Me, Cl, Br) as an electron-accepting unit. Electrochem. studies revealed that oxidation and reduction of these complexes occurred on the rhenium center and the 4,4′-bipyridyl skeleton, resp. The redox potentials of the rhenium complexes are controllable by tuning the substituents on the 4,4′-bipyridyl skeleton and the coordinating groups to the rhenium center. We have also examined the reactivity of the rhenium complexes in electrochem. and photochem. CO2 reduction

Organometallics published new progress about Crystal structure. 660867-80-1 belongs to class alcohols-buliding-blocks, and the molecular formula is C12H18BNO2, Electric Literature of 660867-80-1.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Morris, Louis J.; Hill, Michael S.; Mahon, Mary F.; Manners, Ian; McMenamy, Fred S.; Whittell, George R. published the artcile< Heavier Alkaline-Earth Catalyzed Dehydrocoupling of Silanes and Alcohols for the Synthesis of Metallo-Polysilylethers>, Name: Triphenylmethanol, the main research area is alk earth alkoxide preparation catalyst dehydrocoupling silane alc; crystal structure dinuclear barium calcium strontium bridging phenylmethoxide ferrocenylsiloxane; mol structure dinuclear barium calcium strontium bridging phenylmethoxide ferrocenylsiloxane; dehydrocoupling kinetics silane alc alk earth triphenylmethoxide catalyst; metallopolysilylether preparation; alkaline earth metals; barium; calcium; dehydrocoupling; metallopolymers; strontium.

The dehydrocoupling of silanes and alcs. mediated by heavier alk.-earth catalysts, [Ae{N(SiMe3)2}2·(THF)2] (I-III) and [Ae{CH(SiMe3)2}2·(THF)2], (IV-VI) (Ae = Ca, Sr, Ba) is described. Primary, secondary, and tertiary alcs. were coupled to phenylsilane or diphenylsilane, whereas tertiary silanes are less tolerant towards bulky substrates. Some control over reaction selectivity towards mono-, di-, or tri-substituted silylether products was achieved through alteration of reaction stoichiometry, conditions, and catalyst. The ferrocenyl silylether, FeCp(C5H4SiPh(OBn)2) (2), was prepared and fully characterized from the ferrocenylsilane, FeCp(C5H4SiPhH2) (1), and benzyl alc. using Ba catalysis. Stoichiometric experiments suggested a reaction manifold involving the formation of Ae-alkoxide and hydride species, and dimeric Ae-alkoxides [(Ph3CO)Ae(μ2-OCPh3)Ae(THF)] (3a-c, Ae = Ca, Sr, Ba) were isolated and fully characterized. Mechanistic experiments suggested a complex reaction mechanism involving dimeric or polynuclear active species, whose kinetics are highly dependent on variables such as the identity and concentration of the precatalyst, silane, and alc. Turnover frequencies increase on descending Group 2 of the periodic table, with the Ba precatalyst III displaying an apparent 1st-order dependence in both silane and alc., and an optimum catalyst loading of 3 mol% Ba, above which activity decreases. With precatalyst III in THF, ferrocene-containing poly- and oligosilylethers with ferrocene pendent to (P1-P4) or as a constituent (P5, P6) of the main polymer chain were prepared from 1 or Fe(C5H4SiPhH2)2 (4) with diols 1,4-(HOCH2)2-(C6H4) and 1,4-(CHMeOH)2(C6H4), resp. The resultant materials were characterized by NMR spectroscopy, gel permeation chromatog. (GPC) and DOSY NMR spectroscopy, with estimated mol. weights >20,000 Da for P1 and P4. The Fe centers display reversible redox behavior and thermal anal. showed P1 and P5 to be promising precursors to magnetic ceramic materials.

Chemistry – A European Journal published new progress about Alcohols Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or Reagent). 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Name: Triphenylmethanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts