25804-49-3Relevant academic research and scientific papers
Silver/manganese dioxide nanorod catalyzed hydrogen-borrowing reactions and tert-butyl ester synthesis
Luo, Huanhuan,Wang, Dawei,Xu, Zhaojun,Yang, Bobin,Yang, Yike
, p. 708 - 715 (2021/03/03)
Silver/manganese dioxide (Ag@MnO2) nanorods are synthesized and characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy. It was discovered that Ag@MnO2 nanorods can realize hydrogen-borrowing reactions in high yields and are also effective for the synthesis of tert-butyl esters from aryl cyanides and tert-butyl hydroperoxide in a short period of time. Mechanistic experiments revealed that this catalytic system acts as a Lewis acid in hydrogen-borrowing reactions, while the synthesis of tert-butyl esters occurs through a radical pathway. This is the first report on the excellent catalytic activity of Ag@MnO2 nanorods as a catalyst.
Novel nicotinoid structures for covalent modification of wood: An environmentally friendly way for its protection against insects
Acker, Sophie,Kaufmann, Dieter E.,Namyslo, Jan C.,Plarre, Rudy,S?ftje, Martin
, p. 15726 - 15733 (2020/05/13)
Timber is constantly exposed to environmental influences under outdoor conditions which limits its lifetime and usability. In order to counteract the damaging processes caused by insects, we have developed a novel and more environmentally friendly method to protect wood materials via covalent modification by organic insecticides. Starting with an important class of synthetic insecticides which are derived from the natural insecticide nicotine, various new carboxylic acid derivatives of imidacloprid were made accessible. These activated neonicotinoids were utilized for the chemical modification of wood hydroxy groups. In contrast to conventional wood preservation methods in which biocides are only physically bound to the surface for a limited time, the covalent fixation of the preservative guarantees a permanent effect against wood pests, demonstrated in standardized biological tests. Additionally, the environmental interaction caused by non-bound neonicotinoids is significantly reduced, since both, a smaller application rate is required and leaching of the active ingredient is prevented. By minimizing the pest infestation, the lifetime of the material increases while preserving the natural appearance of the material.
Dual aminoquinolate diarylboron and nickel catalysed metallaphotoredox platform for carbon-oxygen bond construction
Day, Craig,Jia, Xin,Wei, Lanfeng,Xu, Liang,Zu, Weisai
supporting information, p. 8273 - 8276 (2020/08/17)
Herein, aminoquinolate diarylboron complexes are utilized as photocatalysts in dual Ni/photoredox catalyzed carbon-oxygen construction reactions. Via this unified metallaphotoredox platform, diverse (hetero)aryl halides can be conveniently coupled with acids, alcohols and water. This method features operational simplicity, broad substrate scope and good compatibility with functional groups. This journal is
A Zirconium Indazole Carboxylate Coordination Polymer as an Efficient Catalyst for Dehydrogenation-Cyclization and Oxidative Coupling Reactions
Sang, Xinxin,Hu, Xinyu,Tao, Rong,Zhang, Yilin,Zhu, Haiyan,Wang, Dawei
, p. 123 - 129 (2020/02/21)
Rational ligand design is crucial for achieving widespread applications of coordination polymers. The preparation, structural characterisation, and catalytic applications of zirconium (IV) coordination polymer (Zr-IDA), which was derived from 1-(carboxymethyl)-1H-indazole-5-carboxylic acid are reported. The Zr-IDA catalyst contains porous and highly crystalline particles with a quasi-spherical morphology around 100 nm in size, and Zr was coordinated with both O and N as shown by FT-IR and XPS measurements. Importantly, the Zr-IDA catalyst shows great activity, selectivity and stability in the oxidative coupling of benzyl cyanides with tert-butyl hydroperoxide to afford tert-butyl peresters, and the dehydrogenation cyclization of o-phenylenediamines with aromatic alcohols to afford 1,2-disubstituted benzimidazole derivatives. Mechanistic investigations were carried out to study these reactions and the developed catalytic system in more detail.
Pore size dependent cation adsorption in a nanoporous polymer film derived from a plastic columnar phase
Bhattacharjee, Subham,Lugger, Jody A. M.,Sijbesma, Rint P.
supporting information, p. 9521 - 9524 (2018/08/28)
Self-supporting polymer thin films were obtained by the polymerization of an AB3-type hydrogen-bonded complex in the plastic columnar phase. Porous polymers with pore diameters of ≈1.1 and ≈1.6 nm lined with either -COOH or -COONa groups were fabricated from the polymer thin films. Both the pore size and pore collapse influence the adsorption of cations.
Synthesis and Reactivity of 18F-Labeled α,α-Difluoro-α-(aryloxy)acetic Acids
Khotavivattana, Tanatorn,Calderwood, Samuel,Verhoog, Stefan,Pfeifer, Lukas,Preshlock, Sean,Vasdev, Neil,Collier, Thomas L.,Gouverneur, Véronique
supporting information, p. 568 - 571 (2017/02/10)
In this work, we describe the 18F-labeling of α,α-difluoro-α-(aryloxy)acetic acid derivatives and demonstrate that these building blocks are amenable to post-18F-fluorination functionalization. Protodecarboxylation offers a new entry to 18F-difluoromethoxyarene, and the value of this approach is further demonstrated with coupling processes leading to representative 18F-labeled TRPV1 inhibitors and TRPV1 antagonists.
Preparation method for high-purity propofol
-
Paragraph 0043, (2017/05/02)
The invention provides a preparation method for high-purity propofol. The preparation method includes the following steps that S1, under the strong base catalysis condition, a compound shown in the general formula (1) is heated and conducts the decarboxylic reaction in solvent, and a solution system containing the propofol is obtained after acid regulation; and S2, after extraction and alkali washing are conducted on the solution system containing the propofol, the high-purity propofol is obtained through reduced pressure distillation. The invention belongs to the technical field of medicine. The preparation method is wide in raw material source, low in cost, gentle in reaction condition, few in product impurity type and high in product quality, purity is higher than 99.0%, and the requirements for raw material medicine can be met.
Compound has the negative light dispersion, negative dispersion of this compound-containing composition and containing the composition for preparing anisotropic optical (by machine translation)
-
Paragraph 0223; 0224, (2016/10/09)
The invention relates to a kind of reverse wdxrf compound, containing the compound reverse of wavelength dispersion composition and containing the optical anisotropic body. According to the present invention the reverse of wavelength dispersion composition is capable of providing a stronger and more stable reverse wdxrf nature, and can offer excellent optical performance of the optical anisotropic body. (by machine translation)
COMPOUNDS HAVING NEGATIVE OPTICAL DISPERSION, NEGATIVE OPTICAL DISPERSION COMPOSITION COMPRISING THE COMPOUNDS, AND OPTICALLY ANISOTROPIC BODY COMPRISING THE COMPOSITION (As Amended)
-
Paragraph 0154, (2016/08/17)
The present invention relates to a reverse wavelength dispersion compound, a reverse wavelength dispersion composition including the same, and an optically anisotropic body including the same. The reverse wavelength dispersion composition according to the present invention can provide a stronger and more stable reverse wavelength dispersion property, and makes it possible to provide an optically anisotropic body having excellent optical properties.
COMPOSITION FOR MANUFACTURING OPTICAL ELEMENTS WITH NEGATIVE OPTICAL DISPERSION AND OPTICALLY ANISOTROPIC BODY MANUFACTURED THEREFROM
-
Paragraph 0168, (2017/04/26)
The present invention relates to a composition for manufacturing optical elements with negative optical dispersion, and an optically anisotropic body prepared therefrom. According to the present invention, the optically anisotropic body showing stable reverse wavelength dispersion can be prepared more simply by using the composition for optical elements, and it is possible to apply the same to liquid crystal display devices as an optical film such as a thin-layer broadband λ/4 plate.
