94-67-7Relevant articles and documents
Octamolybdate-based hybrids for direct conversion of aldehydes and ketones to oximes
Han, Pei Pei,Li, Jie,Xing, Cui Li,Zhao, Meng,Han, Qiu Xia,Li, Ming Xue
, (2019)
Two inorganic-organic hybrid materials, [Co(L)2]2Na2[β-Mo8O26]·9H2O (1) and [Fe(L)2]2Na2[β-Mo8O26]·9H2O (2) (HL = 2-acetylpyrazine N4-methyl thiosemicarbazone) have been synthesized and characterized by elemental analyses, infrared (IR) spectroscopy, thermal gravimetric analysis (TGA), powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. The hybrids 1 and 2 were explored in the oximation of aldehydes and ketones with in situ generated hydroxylamine by a one-pot procedure. In the crystal structures of 1 and 2, N-containing thiosemicarbazide ligands, Lewis acid, and oxidation catalyst octamolybdate coexist within a confined space providing a promising synergistic catalytic way. Hybrids 1 and 2 displayed high catalytic activity and selectivity for the oximation of aldehydes and ketones.
Catalytic performance of a square planar nickel complex for electrochemical‐ and photochemical‐driven hydrogen evolution from water
Du, Juan,Wang, Chun-Li,Yang, Hao,Zhan, Shu-Zhong
, (2021)
A square planar nickel complex bearing salicylketoxime (SAO), Ni-SAO has been synthesized and well characterized by ESI-MS and single-crystal X-ray diffraction, etc. Ni-SAO exhibits good activity in both electrocatalytic and photocatalytic hydrogen evolution reaction (HER). Under an overpotential (OP) of 837.6 mV, Ni-SAO can electrocatalyze hydrogen evolution from a neutral aqueous buffer with a turnover frequency (TOF) of 1428 mol of hydrogen per mole of catalyst per hour (mol H2 /mol catalyst/h). Moreover, under blue light (λ = 469 nm), a three-component system containing Ni-SAO as a catalyst, CdS nanorods (CdS NRs) as a photosensitizer, and ascorbic acid (H2A) as a sacrificial electron donor also can afford hydrogen with a turnover number (TON) of 8138 mol H2 per mol of catalyst (mol of cat?1) during 48 h irradiation. The highest apparent quantum yield (AQY) is about 16.5% at 469 nm.
Photophysical properties of a boron analogue of coumarin
Schrage, Briana R.,Takematsu, Kana,Wang, Huayi,Ziegler, Christopher J.
, p. 18855 - 18862 (2021)
In this report, we present a study into the structure and electronic properties of difluoroboronsalicylaldoxime (DFBS), a boron-based structural analog of coumarin. The modification of the heterocyclic ring of coumarin with boron results in a compound with similar structural parameters and molecular orbitals to coumarin. DFT and TDDFT calculations reveal a significant stabilization of the LUMO in DFBS; this is supported by a ～40 nm red shift of the lowest electronic transition in the absorption spectrum. Interestingly, DFBS is emissive, while unmodified coumarin is effectively non-radiative. Comparisons between DFBS, emissive coumarin variants, and unmodified coumarin suggest that the charge transfer character of the transition contributes to the fluorescence. This journal is
Poly(N-vinylimidazole): A biocompatible and biodegradable functional polymer, metal-free, and highly recyclable heterogeneous catalyst for the mechanochemical synthesis of oximes
Fahim, Hoda,Ghaffari Khaligh, Nader,Gorjian, Hayedeh
, p. 2007 - 2012 (2022/01/08)
The catalytic activity of poly(N-vinylimidazole), a biocompatible and biodegradable synthetic functional polymer, was investigated for the synthesis of oximes as an efficient, halogen-free, and reusable heterogeneous catalyst. The corresponding oximes were afforded in high to excellent yields at room temperature and in short times using the planetary ball mill technique. Some merits, such as the short reaction times and good yields for poorly active carbonyl compounds, and avoiding toxic, expensive, metal-containing catalysts, and hazardous and flammable solvents, can be mentioned for the current catalytic synthesis of the oximes. Furthermore, the heterogeneous organocatalyst could be easily separated after the reaction, and the regenerated catalyst was reused several times with no significant loss of its catalytic activity.
Method for improving conversion rate of azoxystrobin
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Paragraph 0066-0069, (2021/03/31)
The invention discloses a method for improving the conversion rate of azoxystrobin. The method comprises the following steps: preparing methyl (E)-2-[2-(6-chloropyrimidin-4-yloxy)phenyl]-3-methoxy acrylate; preparing o-hydroxybenzonitrile; mixing methyl (E)-2-[2-(6-chloropyrimidin-4-yloxy)phenyl]-3-methoxy acrylate, o-hydroxybenzonitrile, potassium carbonate and ketene chloride according to a molar ratio of 30: 35: 50: 1.1, and dissolving the obtained mixture in dimethylformamide to obtain a mixed product; and heating the prepared mixed product, keeping the mixed product at a certain temperature, conducting filtering, carrying out reduced-pressure distillation, performing cooling, separating out crystals, carrying out filtering and washing and performing drying to obtain azoxystrobin. On the basis of the prior art, the synthesis of azoxystrobin is improved in the invention, so the yield of azoxystrobin is effectively increased, the conversion rate of the raw materials including methyl(E)-2-[2-(6-chloropyrimidin-4-yloxy)phenyl]-3-methoxy acrylate and o-hydroxybenzonitrile for azoxystrobin in the process of preparing azoxystrobin is effectively improved, and the production benefit of azoxystrobin is improved.
