Category: Tetrahydrofurans

Takada, Kenji; Noda, Takumi; Kobayashi, Takuya; Harimoto, Toyohiro; Singh, Maninder; Kaneko, Tatsuo published the artcile< Synthesis of pH-responsive polyimide hydrogel from bioderived amino acid>, Application In Synthesis of 4415-87-6, the main research area is bioderived amino acid diamino alpha truxillic tetracarboxylic dianhydride polyimide.

A series of biobased polyimides bearing a structure derived from a predetermined tetracarboxylic dianhydride was synthesized. By ionizing the COOH group of the side chain with potassium hydroxide, four kinds of polyimides were solubilized in water, and the water-soluble polyimides were cast onto films over an aqueous solution, leading to higher optical transparency than that of non-water-soluble polyimides. 1H NMR measurements of the polyimides revealed no residual reactants from the polymerization process or side-chain modification. Partial crosslinking of the water-soluble polyimide chains by condensation of the carboxylate side chain with an amino acid-based diamine such as 4-aminophenylalanine or 4,4′-diamino-α-truxillic acid induced the formation of polyimide hydrogels. The remaining COOK groups of the obtained hydrogel were protonated/deprotonated by changing the pH, accompanied by reversible shrinking and swelling.

Polymer Journal (Tokyo, Japan) published new progress about Amino acids Role: RCT (Reactant), RACT (Reactant or Reagent). 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Application In Synthesis of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Song, Yongzhi; Yuan, Lili; Wang, Zhiyuan; Yang, Shiyong published the artcile< Photo-aligning of polyimide layers for liquid crystals>, Computed Properties of 4415-87-6, the main research area is photoaligning polyimide layer liquid crystal display.

A series of soluble and highly transparent semi-alicyclic polyimides (PIs) with designed flexible linkages have been synthesized derived from an alicyclic aromatic dianhydride (1,2,3,4-cyclobutanetetracarboxylic dianhydride, CBDA) and various aromatic ether-bridged diamines. The semi-alicyclic PIs were evaluated as the photo-alignment layers of liquid crystal (LC) mols. in liquid crystal display (LCD). Exptl. results indicate that the photo-alignment characteristics of LC mols. induced by the photo-aligned PI layers and the electro-optical (EO) properties of the LC cell devices are closely related with PI backbone structures. The retardation of the photo-aligned PI layers is correlated with the UV absorption intensity of PI at 220 to approx. 330 nm. The higher UV absorption intensity PI has, the higher retardation and lower pre-tilt angle the photo-aligned PI layer exhibits. The defect-free and photo-aligned PI layer could result into the uniform LC texture, which is highly desired for in-plane switching (IPS) mode LCD devices. In comparison, PI layer containing trifluoromethyl moiety shows poor photo-aligning performance because of the strong electronic withdrawing effect of the fluorinated linkage.

Polymers for Advanced Technologies published new progress about Electrooptical instruments. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Computed Properties of 4415-87-6.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Sasidharan, Sreeja; Pochinda, Simon; Elgaard-Joergensen, Paninnguaq Naja; Rajamani, Sudha; Khandelia, Himanshu; Raghunathan, V. A. published the artcile< Interaction of the mononucleotide UMP with a fluid phospholipid bilayer>, SDS of cas: 58-97-9, the main research area is mononucleotide uridine monophosphate phospholipid cryogenic SEM.

Interaction between mononucleotides and lipid membranes is believed to have played an important role in the origin of life on Earth. Studies on mononucleotide-lipid systems hitherto have focused on the influence of the lipid environment on the organization of the mononucleotide mols., and the effect of the latter on the confining medium has not been investigated in detail. We have probed the interaction of the mononucleotide, UMP (UMP), and its disodium salt (UMPDSS) with fluid dimyristoylphosphatidylcholine (DMPC) membranes, using small-angle X-ray scattering (SAXS), cryogenic SEM (cryo-SEM) and computer simulations. UMP adsorbs and charges the lipid membrane, resulting in the formation of unilamellar vesicles in dilute solutions Adsorption of UMP reduces the bilayer thickness of DMPC. UMPDSS has a much weaker effect on interbilayer interactions. These observations are in very good agreement with the results of an all-atom mol. dynamics simulation of these systems. In the presence of counterions, such as Na+, UMP forms small aggregates in water, which bind to the bilayer without significantly perturbing it. The phosphate moiety in the lipid headgroup is found to bind to the hydrogens from the sugar ring of UMP, while the choline group tends to bind to the two oxygens from the nucleotide base. These studies provide important insights into lipid-nucleotide interactions and the effect of the nucleotide on lipid membranes.

Soft Matter published new progress about Boltzmann constant. 58-97-9 belongs to class tetrahydrofurans, and the molecular formula is C9H13N2O9P, SDS of cas: 58-97-9.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Ruan, Luna; Zhang, Huan; Zhou, Man; Zhu, Lihua; Pei, An; Wang, Jiexiang; Yang, Kai; Zhang, Chuanqun; Xiao, Suqun; Chen, Bing Hui published the artcile< A highly selective and efficient Pd/Ni/Ni(OH)2/C catalyst for furfural hydrogenation at low temperatures>, Recommanded Product: (Tetrahydrofuran-2-yl)methanol, the main research area is furfural hydrogenation nickel palladium carbon nanocatalyst furfuryl alc.

Hydrogenation of furfural (FF) produces a train of products such as furfuryl alc. (FFA), tetrahydrofurfuryl alc. (THFFA) and 2-methylfuran (2-MF). The Pd/Ni/Ni(OH)2/C nanocatalyst was successfully prepared under mild conditions by hydrazine hydrate reduction and galvanic replacement methods. Pd/Ni/Ni(OH)2/C had much higher conversion of furfural and selectivity toward furfuryl alc. for the selective hydrogenation of furfural than the monometallic catalysts (eg. Pd/C or Ni/C) due to its unique nanostructure of palladium island-on-Ni/Ni(OH)2 nanoparticles and thus the synergy effect between Pd, Ni and Ni(OH)2 related species. The proposed mechanism of the synergistic effect was also provided. Pd/Ni/Ni(OH)2/C showed high selectivity (90.0% or 92.4%) to furfuryl alc. at quite low reaction temperatures (5°C or 10°C), and had good stability. We used various characterization techniques (XRD, HRTEM, STEM-EDS elemental mapping and line-scanning, XPS, HS-LEIS) to compare the nanostructural differences between the monometallic and bimetallic catalysts as well as to explain the possible reasons for the superior performance of Pd/Ni/Ni(OH)2/C to corresponding monometallic catalysts.

Molecular Catalysis published new progress about Hydrogenation. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Recommanded Product: (Tetrahydrofuran-2-yl)methanol.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Weerachawanasak, Patcharaporn; Krawmanee, Pacharaporn; Inkamhaeng, Weerachat; Cadete Santos Aires, Francisco J.; Sooknoi, Tawan; Panpranot, Joongjai published the artcile< Development of bimetallic Ni-Cu/SiO2 catalysts for liquid phase selective hydrogenation of furfural to furfuryl alcohol>, Name: (Tetrahydrofuran-2-yl)methanol, the main research area is development bimetallic nickel copper SiO2 catalyst liquid hydrogenation furfural.

Bimetallic Ni-Cu/SiO2 catalysts with different Cu loading (2-5 wt%) were developed for liquid phase selective hydrogenation of furfural to furfuryl alc. Among these, bimetallic 2%Ni-X%Cu/SiO2 (X = 2, 5) catalysts exhibited better catalytic performances than monometallic 2%Ni/SiO2 and 2%Cu/SiO2. Moreover, the bimetallic 2%Ni-5%Cu/SiO2 catalyst showed the best catalytic performance with 94% of furfural conversion and 64% of furfuryl alc. selectivity. The synergetic effect of NiCu alloy particles that are present on bimetallic Ni-Cu/SiO2 catalysts change the adsorption configuration of furfural on the catalyst surface resulting in high catalytic performance in liquid phase selective hydrogenation of furfural to furfuryl alc.

Catalysis Communications published new progress about Hydrogenation catalysts. 97-99-4 belongs to class tetrahydrofurans, and the molecular formula is C5H10O2, Name: (Tetrahydrofuran-2-yl)methanol.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem

Wappes, Ethan A.; Vanitcha, Avassaya; Nagib, David A. published the artcile< β C-H di-halogenation via iterative hydrogen atom transfer>, Name: 2,2,5,5-Tetramethyldihydrofuran-3(2H)-one, the main research area is geminal dihalide regioselective preparation; imidate preparation photochem tandem dihalogenation hydrogen transfer.

A radical relay strategy for mono- and di-halogenation (iodination, bromination, and chlorination) of sp3 C-H bonds was developed. This is the first example of β C-H di-halogenation is achieved through sequential C-H abstraction by iterative, hydrogen atom transfer (HAT). A double C-H functionalization was enabled by in-situ generated imidate radicals, which facilitate selective N to C radical translocation and tunable C-X termination. The versatile, geminal di-iodide products were further elaborated to β ketones and vinyl iodides. Mechanistic experiments explained the unique di-functionalization selectivity of this iterative HAT pathway, wherein the second C-H iodination is twice as fast as the first.

Chemical Science published new progress about Aliphatic alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 5455-94-7 belongs to class tetrahydrofurans, and the molecular formula is C8H14O2, Name: 2,2,5,5-Tetramethyldihydrofuran-3(2H)-one.

Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem