五氟苯基丙-2-炔醚(1)在370℃的二氧化硅上真空蒸馏,然后异构化为2-氟甲基-4,5,6,7-四氟苯并[ b ]-呋喃(3)。醚(1)在140°C下与苯和对二甲苯反应,分别得到2-芳基甲基-4,5,6,7-四氟苯并[ b ]呋喃衍生物(4)和(8),而1, 3,4,5,6,7,8-七氟-2-萘丙-2-炔基醚(2)在140°C下与相同的溶剂反应生成相应的2-芳基甲基4,5,6,7 ,8,9-六氟萘并[2,1- b ]呋喃衍生物(9)和(10)。
Alkaline metal fluorides in graphite - new catalysts in organic synthesis. I. Reactions of polyfluoroaromatic compounds with O- and N-nucleophilic agents
The paper reports the use of new catalysts - alkaline metal fluorides in graphite of the general formula C8MF, where M=Li, Na, K, Rb or Cs, in the reactions of polyfluoroaromatic compounds with aromatic OH-acids and piperidine. These compounds are shown to have a high activity in the above processes, exceeding that of similar free fluorides of alkaline metals.
Selective C-F arylation of polyfluorophenols with aryl sulfoxides has been accomplished by means of a sigmatropic dearomatization/defluorination sequence. This sequence consists of three processes: 1) interrupted Pummerer reaction to form S-O-tethered sulfonium salt; 2) C-C-forming [3,3] sigmatropic rearrangement with dearomatization; and 3) Zn-mediated defluorinative rearomatization. The present biaryl
H-Bonded complexes of adenine with Rebek imide receptors are stabilised by cation–π interactions and destabilised by stacking with perfluoroaromatics
作者:Raffaella Faraoni、Ronald K. Castellano、Volker Gramlich、François Diederich
DOI:10.1039/b314353h
日期:——
A series of Rebek imide receptors with naphthalene or heteroaromatic platforms attached by amide or ester linkers have been prepared from the corresponding acyl chloride or anhydride; the X-ray crystal structure of the receptor-derived anhydride reveals a supramolecular H-bonded helix formation in the crystal; the complexes of adenine bound to the receptors by Hoogsteen H-bonding are found to be stabilised by stacking with a methylquinolinium ion, but destabilised by stacking with a perfluorinated naphthalene.
从相应的酰基氯或酸酐中制备出了一系列具有萘或杂芳香族平台的 Rebek 亚胺受体,这些平台通过酰胺或酯链接物连接;受体衍生酸酐的 X 射线晶体结构显示,晶体中形成了超分子 H 键螺旋;发现通过胡格氏 H 键结合到受体上的腺嘌呤复合物通过与甲基喹啉离子堆叠而变得稳定,但通过与全氟萘堆叠而变得不稳定。
Electrochemical O-trifluoromethylation of electron-deficient phenols
A simple and sustainable one-step strategy for the preparation of electron-deficient aryl trifluoromethyl ethers (ArOCF3) from the corresponding phenols by electrochemical synthesis is presented. Anodic oxidation of trifluoromethane sulfinate (Langlois reagent) leads to direct O-trifluoromethylation of phenol-derivatives bearing fluorine, chlorine, bromine and nitrile substituents under mild conditions
Oxidation of perfluoronaphthols by lead tetraacetate and lead dioxide
作者:V.N. Kovtonyuk、L.S. Kobrina、G.G. Yakobson
DOI:10.1016/s0022-1139(00)82675-5
日期:1981.10
Depending on the reaction conditions, oxidation of perfluoronaphthols by Pb(OAc)4 proceeds by two routes. Under mild conditions (20°C) oxidation leads to the products of dimerisation of perfluoronaphthoxy radicals. At a higher temperature (80°C) the reaction leads to acetoxydienones. The mechanistic aspects of oxidation of perfluoronaphthols by Pb(OAc)4 are discussed.