C-H Bond Activation of Arenes by 8,8 ’-mu-I-3,3 ’-Co(1,2-C2B9H10)(2) in the Presence of Sterically Hindered Lewis Basesстатья
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Аннотация:Reactions of the iodonium derivative of cobalt bis(dicarbollide) anion [μ-8,8'-I-3,3'-Co(1,2-
C2B9H10)2] with Lewis bases in aromatic solvents were studied. The reactions proceed through the
iodonium bridge opening, and the structure of the reaction products depends strongly on the nature
of the Lewis base and solvent used. The reactions with conventional Lewis bases (L) give the corresponding products of Lewis base addition, [8-L-8'-I-3,3'-Co(1,2-C2B9H10)2], whereas the reactions
with sterically hindered Lewis bases (L*) result in activation of theC-Hbond of the aromatic solvent
with formation of the corresponding aryl derivatives [8-Ar-8'-I-3,3'-Co(1,2-C2B9H10)2]-. Activated
arenes, such as toluene, could react with [μ-8,8'-I-3,3'-Co(1,2-C2B9H10)2] without Lewis bases,
whereas strongly deactivated arenes do not give C-H activation products even in the presence of
sterically hindered Lewis bases.