Deconstructing the Catalytic, <i>Vicinal</i> Difluorination of Alkenes: HF-Free Synthesis and Structural Study of <i>p</i>-TolIF<sub>2</sub>
作者:Jérôme C. Sarie、Christian Thiehoff、Richard J. Mudd、Constantin G. Daniliuc、Gerald Kehr、Ryan Gilmour
DOI:10.1021/acs.joc.7b01671
日期:2017.11.17
an efficient synthesis of p-TolIF2 from p-TolI and Selectfluor is presented, together with a crystallographic and spectroscopic study. To mitigate safety concerns and simplify reaction execution, an HF-free protocol was devised employing CsF as a substitute fluoride source. The study provides insight into the initial I(I)→I(III) oxidation stage of the catalytic protocol using Selectfluor.
Reaction of Xenon Difluoride. Part II. Oxidative-fluorination of Phosphorus and Iodine Compounds and Cleavage of Silicon–Sulfur and Silicon–Nitrogen Bonds
作者:James Andrew Gibson、Ronald Kirk Marat、Alexander F. Janzen
DOI:10.1139/v75-432
日期:1975.10.15
oxidative-fluorination, and a mixture of products was obtained. Reaction of xenon difluoride with methyl iodide gives methyliodine(III) difluoride, characterized by proton and fluorine n.m.r. spectroscopy.Silicon–sulfur and silicon-nitrogen bonds are cleaved by xenon difluoride and an intermediate containing a xenon–nitrogen bond is postulated.Reaction of xenon difluoride with hexafluoroacetone, perfluoropinacol
Apparent Electrophilic Fluorination of 1,3-Dicarbonyl Compounds Using Nucleophilic Fluoride Mediated by PhI(OAc)<sub>2</sub>
作者:Toby J. Nash、Graham Pattison
DOI:10.1002/ejoc.201500370
日期:2015.6
The apparent electrophilicfluorination of 1,3-dicarbonylcompounds using Et3N·3HF as a nucleophilic fluoride source is reported. This reaction requires PhI(OAc)2 as oxidant and can be conducted safely in standard laboratory glassware. Alternative selectivity compared to Selectfluor was observed in some cases. This approach may reduce our reliance on difficult-to-handle fluorine gas and expensive electrophilic
Targeted Fluorination with the Fluoride Ion by Manganese-Catalyzed Decarboxylation
作者:Xiongyi Huang、Wei Liu、Jacob M. Hooker、John T. Groves
DOI:10.1002/anie.201500399
日期:2015.4.20
catalytic decarboxylative fluorination reaction based on the nucleophilic fluorideion. The reported method allows the facile replacement of various aliphatic carboxylic acid groups with fluorine. Moreover, the potential of this method for PET imaging has been demonstrated by the successful 18F labeling of a variety of carboxylic acids with radiochemical conversions up to 50 %, representing a targeted
reactions; however, they are difficult to synthesize via conventional reactions. We present an efficient and practical method for decarboxylative bromination of sterically hindered 3D aliphatic carboxylicacids using commercially available (diacetoxyiodo)benzene and potassium bromide, one of the most stable and cheapest bromine sources in nature. The present method features a metal-free/Br2-free system