The fragmentation of polyfluorinated benzylic alcohols: the first observation of pentafluorophenyl anion as a good leaving group
作者:Charles M. Garner、Henry C. Fisher
DOI:10.1016/j.tetlet.2006.08.069
日期:2006.10
Treatment of a series of pentafluorobenzylic alcohols with sodium methoxide in DMSO results in a rapid carbon–carbon cleavage reaction, yielding a ketone or aldehyde as well as pentafluorobenzene, which undergoes subsequent nucleophilic aromatic substitution (NAS). In methanol solvent, the fragmentation is very slow, and NAS without fragmentation occurs almost exclusively. In methanol/DMSO mixtures
hexafluorobenzene in the presence of benzophenone resulted in both, substitution and addition products. Similar photoreaction has been observed by irradiation of hexafluorobenzene in some alcohols in the presence of benzophenone. The reaction of pentafluorobenzene with methanol or cyclohexane resulted in the substitution of a 2-or 4-fluoro atom, while the reaction of pentafluoroanisole resulted in the formation of
Mechanochemical protocol facilitates the generation of arylmanganese nucleophiles from unactivated manganese metal
作者:Rina Takahashi、Pan Gao、Koji Kubota、Hajime Ito
DOI:10.1039/d2sc05468j
日期:——
organomanganese reagents from organichalides and manganese metal remains a challenge. Current solution-based approaches require the preparation of activated manganese (Rieke manganese) or the use of multiple metal additives to promote the insertion of manganese metal into a carbon–halogen bond. Here, we show that a mechanochemical ball-milling protocol facilitates the generation of various arylmanganese nucleophiles
An Exceptional Hydroboration of Substituted Fluoroolefins Providing Tertiary Alcohols
作者:P. Veeraraghavan Ramachandran、Michael P. Jennings
DOI:10.1021/ol016779e
日期:2001.11.1
[GRAPHICS]A rare hydroboration-oxidation providing 3 degrees -alcohols has been achieved in the case of 1,1,2-perfluoroalkyl(MI)ethylenes. The hydroboration of substituted perfluoroalkyl(aryl)ethylenes with dichloroborane reveals that the regioselectivity does not entirely depend on the electronics of the fluoroolefins.