排序方式: 共有19条查询结果,搜索用时 15 毫秒
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Elise Deunf Olivier Buriez Eric Labbé Jean-Noël Verpeaux Christian Amatore 《Electrochemistry communications》2009,11(1):114-117
The electrochemical behavior of a new cobalt–cyclodextrin (CD) complex was investigated, in dimethylformamide, from CoX2 (X = Br and BF4) in the presence of 1 equiv. 6-Deoxy-6-N-(2-methyliminopyridine)-β-cyclodextrin as ligand. Under these conditions, it was demonstrated for the first time, that the electrogenerated cobalt(I) species can be kinetically and thermodynamically stabilized. The electrochemical study of CoX2 in the presence of a related iminopyridine ligand (2-pyridyl-N-benzylmethylimine), in which the cyclodextrin (CD) group was replaced by a simple aryl moiety, allowed to highlight the crucial role of the CD in this unexpected stabilization. Importantly, this unprecedented result was only observed when both the iminepyridine and the CD moieties were together covalently attached. Importantly, the supramolecular stabilized low-valent cobalt species remained fairly reactive towards aromatic halides despite its intrinsic stability. This original work opens new opportunities for the development of more selective catalytic processes both in organic and aqueous media. 相似文献
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Polubarinova-Kochina's analytical differential equation methodis used to determine the pseudo-steady-state solution to problemsinvolving the freezing (solidification) of wedges of liquidwhich are initially at their fusion temperature. In particular,we consider four distinct problems for wedges which are: freezingwith the same constant boundary temperature, freezing with thesame constant boundary heat fluxes, freezing with distinct constantboundary temperatures and freezing with distinct constant fluxesat the boundaries. For the last two problems, a Heun's differentialequation with an unknown singularity is derived, which in bothcases admits a particularly elegant simple solution for thespecial case when the wedge angle is . The moving boundariesobtained are shown pictorially. 相似文献
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Jean-Bernard Baudin Marc Julia Christian Rolando Jean-Noël Verpeaux 《Tetrahedron letters》1984,25(30):3203-3204
α-sulfonyl litiated anions are oxidized by cupric carboxylates into β, β-unsaturated sulfones. Primary sulfones lead to pure trans-vinylic sulfones. 相似文献
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Srinu Bodige Parameshwar Ravula Kali Charan Gulipalli Srinivas Endoori Purna Koteswara Rao Cherukumalli Narendra Sharath Chandra JN 《合成通讯》2013,43(17):2219-2234
AbstractA novel series pyrrolo[3,2-b]pyridine-3-carboxamide linked 2-methoxypyridine derivatives have been designed, synthesized and confirmed by FT-IR, 1H NMR, 13C NMR, 19F NMR, MS, and elemental analysis. The synthesized compounds were screened for their antitubercular activity using microplate alamar blue assay method and antibacterial activity. Among the tested compounds, 4- fluorophenyl (8m), 4- chlorophenyl (8n) and 4-methoxyphenyl (8i) showed potent anti-TB activity (3.12?µg/mL) in comparison with reference drug, Pyrazinamide ((3.12?µg/mL). In addition, all compounds were docked into DprE1 (PDB code: 4KW5) to explore their binding interactions at the active site. The compounds exhibited essential key interactions as that of reported DprE1 inhibitors and hence, the synthesized compounds may be considered as molecular scaffolds for antitubercular activity. Compounds, 4-chlorophenyl (8n) and 4-flurophenyl (8m) showed significant antibacterial activity against Escherichia coli and Staphylococcus aureus strains. In silico prediction of toxicities, druglikeness and drug score profiles of the tested compounds are promising. 相似文献