Ling Li, W. Brennessel, W. Jones
May 4, 2009
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Organometallics
Abstract
Sodium acetate promoted C−H activation in a series of para-substituted phenyl imines has been examined using [Cp*MCl2]2 (M = Ir, Rh). The regioselectivity was investigated using a series of meta-substituted phenyl imines (−OMe, −CH3, −F, −COOMe, −CF3, and −CN) and 2-phenylpyridines (−OMe, −CH3, and −CF3). It was found that substrates with electron-donating substituents react significantly faster than substrates with electron-withdrawing substituents, which is consistent with an electrophilic C−H activation mechanism. It was also found that the regioselectivity of the C−H activation was extremely sensitive to steric effects, with a meta methyl group leading to only one regioisomer. Solvent and temperature studies showed that the reaction rate can be increased both by increasing temperature and by using polar solvents such as methanol. The regioselectivity was solvent dependent for the reaction with [Cp*IrCl2]2 but independent of solvent for the reaction with [Cp*RhCl2]2. The regioselectivity was temperatur...