<i>cis</i>-Specific Hydrofluorination of Alkenylarenes under Palladium Catalysis through an Ionic Pathway
作者:Enrico Emer、Lukas Pfeifer、John M. Brown、Véronique Gouverneur
DOI:10.1002/anie.201310056
日期:2014.4.14
paper describes the hydrofluorination of alkenes through sequential H− and F+ addition underpalladiumcatalysis. The reaction is cis specific, thus providing access to benzylic fluorides. The mechanism of this reaction involves an ionicpathway and is distinct from known hydrofluorinations involving radical intermediates. The first catalytic enantioselective hydrofluorination is also disclosed.
Photolysis of Bromo- and Chloro-Substituted Benzyl Derivatives. Competition between Ionic and Radical Pathways
作者:Berta Košmrlj、Boris Šket
DOI:10.1021/jo0001481
日期:2000.10.1
solutions of tetrahydrofuran, acetonitrile, and cyclohexane. The effect of free radical inhibitor and metal hydrides on products formation as well as their ratio was analyzed to elucidate the reaction pathway. In the first step homolytic C-X bondcleavage occurs from a single excited state, resulting in a biradical pair. Further reaction path depends on the type of the halogen bonded and on the solvent polarity
Electrophilic Fluorinating Reagent Mediated Synthesis of Fluorinated α-Keto Ethers, Benzil, and 6,6‘-Dialkoxy-2,2‘-bipyridines
作者:Sudha Manandhar、Rajendra P. Singh、Gary V. Eggers、Jean'ne M. Shreeve
DOI:10.1021/jo0258554
日期:2002.9.1
regioselectively, in excellent isolated yields. On the other hand, fluorinated alcohols did not react with MEC-31. Reaction of MEC-31 with an excess of diethylene glycol (7) gave the bipyridine derivative (8) in 88% isolated yield. Reaction of 8 either with diethylaminosulfurtrifluoride (DAST) or bis(2-methoxyethyl)aminosulfur trifluoride (Deoxofluor) readily produced the corresponding difluoro derivative