Month: December 2022

Chen, Guancong published the artcileRapidly and repeatedly reprogrammable liquid crystalline elastomer via shape memory mechanism, Product Details of C17H28O8S4, the main research area is reprogrammable liquid crystalline acrylic elastomer shape memory property; liquid crystalline elastomers; mesogen alignment; reversible actuators; shape memory polymers.

Realization of muscle-like actuation for a liquid crystal elastomer (LCE) requires mesogen alignment, which is typically achieved/fixed chem. during the synthesis. Post-synthesis regulation of the alignment in a convenient and repeatable manner is highly desirable yet challenging. Here, a dual-phase LCE network is designed and synthesized with a crystalline melting transition above a liquid crystalline transition. The crystalline phase can serve as an ”alignment frame” to fix any mech. deformation via a shape memory mechanism, leading to corresponding mesogen alignment in the liquid crystalline phase. The alignment can be erased by melting, which can be the starting point for reprogramming. This strategy that relies on a phys. shape memory transition for mesogen alignment permits repeated reprogramming in a timescale of seconds, in stark contrast to typical methods. It further leads to unusual versatility in designing 3D printed LCE with unlimited programmable actuation modes.

Advanced Materials (Weinheim, Germany) published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Product Details of C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Yang, Haimei published the artcileAn array consisting of glycosylated quantum dots conjugated to MoS2 nanosheets for fluorometric identification and quantitation of lectins and bacteria, Safety of (2R,3R,4S,5R,6R)-2-(Allyloxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol, the main research area is lectin glycosylated quantum dot molybdenum disulfide nanosheet fluorometry; Fluorescence; Linear discriminant analysis; Milk sample; Multiple analysis; Saccharide binding.

A fluorescent array based on the use of saccharide-functionalized multicolored quantum dots (s-QDs) and of 4-mercaptophenylboronic acid-functionalized MoS2 nanosheets (PBA-MoS2) was constructed for multiple identification and quantitation of lectins and bacteria. In this array, the fluorescence of the s-QDs is quenched by the PBA-MoS2 nanosheets. In the presence of multiple lectins, s-QDs differentially detach from the surface of PBA-MoS2 nanosheets, producing distinct fluorescence response patterns due to both quenching and enhancement of fluorescence. By analyzing the fluorescence responses with linear discriminant anal., multiple lectins and bacteria were accurately identified with 100% accuracy. The limits of detection of Con A, Pisum sativum agglutinin, Peanut agglutinin, and Ricius communis I agglutinin are as low as 3.7, 8.3, 4.2 and 3.9 nM, resp. The array has further been evidenced to be potent for distinguishing and quantifying different bacterial species by recognizing their surface lectins. The detection limits of Escherichia coli and Enterococcus faecium are 87 and 66 cfu mL-1, resp.

Microchimica Acta published new progress about Arachis hypogaea (agglutinin). 2595-07-5 belongs to class alcohols-buliding-blocks, name is (2R,3R,4S,5R,6R)-2-(Allyloxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol, and the molecular formula is C9H16O6, Safety of (2R,3R,4S,5R,6R)-2-(Allyloxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Rout, P. K. published the artcileFractional hydrodistillation of Citronella (Cymbopogon winterianus Jowitt), Recommanded Product: 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, the main research area is hydrodistillation Citronella oil.

Fractional hydro-distillation of Citronella Grass (C. winterianus Jowitt) and anal. of the decanted oil fractions showed that citronellal-rich fractions and sesquiterpenoid-rich fractions can be separated at the hydrodistillation stage itself. About 6% essential oil is lost in the aqueous layer. Further, 4 constituents, 6-methyl-5-hepten-2-one, benzyl alc., 2-[2-hydroxy-2-propyl]-5-menthylcyclohexanol and terpin hydrate present in significant quantities in the aqueous layer are not detected in any of the decanted oil fractions.

Fafai Journal published new progress about Sesquiterpenes Role: ANT (Analyte), NPO (Natural Product Occurrence), ANST (Analytical Study), BIOL (Biological Study), OCCU (Occurrence). 42822-86-6 belongs to class alcohols-buliding-blocks, name is 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, and the molecular formula is C10H20O2, Recommanded Product: 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Pawliczek, Martin published the artcileAlkylative kinetic resolution of vicinal diols under phase-transfer conditions: a chiral ammonium borinate catalysis, Quality Control of 92093-23-7, the main research area is alc benzyloxy allyloxy asym synthesis; vicinal diol enantioselective regioselective phase transfer alkylative kinetic resolution.

Enantioselective synthesis of alcs. I [R1 = Ph, 2-MeC6H4, cyclohexyl, etc.; R2 = Ph, 2-MeC6H4, 2-naphthyl, (E)-PhCH:CH, etc.] and II (R3 = Ph, 4-FC6H4, 3-thienyl, etc.; R4 = Me, CH2:CHCH2) via alkylative kinetic resolution of vicinal diols R1CH(OH)CH2OH or R3R4C(OH)CH2OH, resp., with allylic or benzylic bromides realized by cooperative use of a chiral quaternary ammonium salt and an achiral borinic acid is reported. In addition, a catalytic regioselective alkylation of a secondary alc. in the presence of an unprotected primary one was presented, emphasizing the unique selectivity and potential of this ammonium borinate catalysis.

Chemical Science published new progress about Alkylation catalysts, stereoselective. 92093-23-7 belongs to class alcohols-buliding-blocks, name is 1-(4-Bromophenyl)ethane-1,2-diol, and the molecular formula is C8H9BrO2, Quality Control of 92093-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Daneshmehr, Shahla published the artcileThe surface modification of boron nitride particles, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is boron nitride surface modification.

The use of coupling agents to enhance the thermal conductivity of composites of epoxy and boron nitride (BN) has been investigated. Two types of BN particles, lightly aggregated platelets with an average size of 6μm and agglomerates with an average size of 120μm, have been used. Different proportions of these BN particles, up to a volume percentage of approx. 34%, were mixed with a stoichiometric epoxy-thiol system and cured either isothermally or non-isothermally. The cure kinetics was investigated by differential scanning calorimetry, and the thermal conductivity of isothermally fully cured samples was measured. The effect of surface treatment of the particles was extensively investigated, with respect to the characteristics of the particles themselves, the cure kinetics and the thermal conductivity of the cured composites. The BN particles were treated with a silane coupling agent, both with and without previously treating the BN with a sodium hydroxide solution IR spectroscopy and thermogravimetric anal. were used to assess whether or not the silane had been attached to the BN particles, and the effect of the surface treatment on the cure kinetics was studied. Although the cure kinetics suggested that the surface treatment was more effective for the 6μm particles than for the 120μm agglomerates, it did not generally lead to an increase in the thermal conductivity, while SEM showed that the coupling agent was not attached to the BN particles. It is concluded that truly platelet-shaped particles are necessary for effective surface treatment.

Journal of Thermal Analysis and Calorimetry published new progress about Glass transition temperature. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Peng, X. published the artcileThiol-Ene Photopolymerization under Blue, Green and Red LED Irradiation, Synthetic Route of 7575-23-7, the main research area is thiol ene photopolymerization blue green red LED irradiation.

Photopolymerization allows fast production of materials with special properties; however, a short wavelength of light is required for most com. photoinitiating systems and the oxygen inhibition effect for the free radical polymerization has limited possible applications. Herein, we investigate thiol-ene photopolymerization with various types of ene derivatives and thiols using our previously reported photoinitiator 2-(4-methoxystyryl)-4,6-bis(trichloromethyl)-1,3,5-triazine (triazine) alone or in combination with rubrene or 1,4-bis(isopropylamino)anthraquinone (SB36) as the photoinitiating systems to trigger polymerization under irradiation with blue, green, and red LEDs. An anal. of photopolymerization kinetics and the effects of different light irradiation conditions, chem. structures, composites of ene and thiol monomers, and air on the thiol-ene photopolymerization reaction are presented. Specifically, rates of photopolymerization of all thiol-ene formulations decrease as the wavelength of irradiation increases and show no significant difference when polymerization occurs under air or in laminate. Mech. properties and homogeneity of the photocured samples are analyzed and demonstrated that all thiol-ene formulations appear to have a homogeneous network. Regarding mech. properties, with a lower amount of thiol incorporated in the network, the storage modulus and the glass transition temperature (Tg) of the photocured product increased. Storage stability of thiol-ene formulations is also studied and 5-hydroxy-1,4-naphthoquinone (5HNQ), a naturally derived dye derivative, is found to be successful in inhibiting premature gelation in thiol-ene systems without significantly affecting the photopolymerization performance.

ChemPhotoChem published new progress about Glass transition temperature. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

He, Taoyu published the artcileA study on electro-optical properties of polymer dispersed liquid crystal films doped with barium titanate nanoparticles prepared by nucleophile-initiated thiol-ene click reaction, Computed Properties of 7575-23-7, the main research area is barium titanate nanoparticle doped polymer dispersed liquid crystal film.

Polymer-dispersed liquid crystal (PDLC) films doped with barium titanate (BTO) nanoparticles were prepared by nucleophile-initiated thiol-ene click reaction. The effects of BTO content and reaction temperature on the electro-optical properties of PDLC were explored. It is found that the size of liquid crystal droplets is bigger when the amount of BTO increases. As the BTO content increases, the transmittance first rises and then falls, while the voltage that drives the liquid crystal orientation first drops and then rises. The electro-optical properties of PDLC doped with BTO show a similar changing trend with the change of reaction temperature However, when the reaction temperature becomes higher, the influence of BTO on the electro-optical properties of PDLC becomes greater. Doping BTO helps to obtain PDLC films with good electro-optical properties.

Liquid Crystals published new progress about Click chemistry. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Di Brisco, Riccardo published the artcileDevelopment of a fluorescent probe for the study of the sponge-derived simplexide immunological properties, Application In Synthesis of 2595-07-5, the main research area is simplexide immunol fluorescent probe disaccharide glycoside preparation glycosylation pentatriacontanol.

Simplexide is a glycolipid of marine origin, endowed with immunol. properties, composed of a long chain secondary alc. glycosylated by an α-D-glucosyl-(1→4)-β-D-galactosyl disaccharide residue. Herein we describe the preparation of a fluorescent derivative of simplexide, labeled at position 6 of the distal glucose with a dansyl group, as a probe for future studies on the mechanism by which simplexide affects the immune system. Fluorescent simplexide was prepared from a 6”-amino functionalized compound, which in turn was obtained through a highly efficient glycosylation between the preformed activated disaccharide and the long chain secondary alc. 18-pentatriacontanol.

Carbohydrate Research published new progress about Fluorescent indicators. 2595-07-5 belongs to class alcohols-buliding-blocks, name is (2R,3R,4S,5R,6R)-2-(Allyloxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol, and the molecular formula is C9H16O6, Application In Synthesis of 2595-07-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ji, Xiaoliang published the artcilePalladium-Catalyzed Cross Haloalkynylation of Haloalkynes, Quality Control of 107-54-0, the main research area is dihaloalkenyne preparation regioselective chemoselective diastereoselective; haloalkynol haloalkyne cross haloalkynylation palladium catalyst.

A robust Pd-catalyzed haloalkynylation of haloalkynes for the synthesis of dihaloalkenyne derivatives R1R2C(OH)C≡CC(R3)=C(R4)R5 [R1 = Me, Et, n-Bu, i-Bu, 3-ClC6H4CH2; R2 = Me, Et, n-Bu, i-Bu; R3 = Br, Cl; R4 = Br, Cl; R5 = hexyl, Ph, 4-MeC6H4, etc.; R1R2 = (CH2)4, (CH2)5, (CH2)7, etc.] was developed. This cross-haloalkynylation reaction proceeded in a highly chemo- and regioselective manner under mild conditions in the presence of two slightly structurally different haloalkynes and showed strong functional group tolerance under ligand- and base-free conditions.

Organic Letters published new progress about Alkynyl alcohols Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 107-54-0 belongs to class alcohols-buliding-blocks, name is 3,5-Dimethylhex-1-yn-3-ol, and the molecular formula is C8H14O, Quality Control of 107-54-0.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Perez, Maria published the artcileSynthesis of novel glycoconjugates and evaluation as inhibitors against β-glucosidase from almond, SDS of cas: 2595-07-5, the main research area is hydrolase glucosidase inhibition glycoside glycoconjugate preparation disaccharide structure activity; amino glycoside disaccharide preparation glucosidase inhibitor glycoconjugate glucosaminide lactose.

Hydrolytic activity of glycosidases can be influenced by inhibitors of glycosidic nature. We have synthesized glycoconjugates consisting of galactose, glucosaminide or lactose 1-O-linked with allyl alc., pentenol or tetra-ethylene-glycol moieties. These compounds were found to be inhibitors of the hydrolase activity of the β-glucosidase from almond, with Ki in the range of 7.7-107 mM and presenting different types of inhibition. Based on the structure of the functionalized glycosides and the inhibition studies performed, we suggest that the nature of the carbohydrate is determinant in the inhibitory strength of these glycoconjugates.

Journal of Molecular Catalysis B: Enzymatic published new progress about Disaccharides Role: BSU (Biological Study, Unclassified), RCT (Reactant), SPN (Synthetic Preparation), BIOL (Biological Study), RACT (Reactant or Reagent), PREP (Preparation). 2595-07-5 belongs to class alcohols-buliding-blocks, name is (2R,3R,4S,5R,6R)-2-(Allyloxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol, and the molecular formula is C9H16O6, SDS of cas: 2595-07-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts