C-H bond activation by unsymmetrical 2-(N-arylimino)pyrrolide Pt complexes: geometric effects on reactivity |
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| Authors: | Iverson Carl N Carter Charles A G Baker R Tom Scollard John D Labinger Jay A Bercaw John E |
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| Affiliation: | Los Alamos Catalysis Initiative, Chemistry Division, MS J514, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. bakertom@lanl.gov |
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| Abstract: | Reactions of chloroplatinum methyl complexes with N-(arylimino)pyrrolide anions afford cis and trans neutral platinum methyl complexes. Isomers with methyl trans to the pyrrolide nitrogen activate benzene C-H bonds at 85 degrees C more than 80 times faster than the corresponding cis isomer. In addition, reactions of platinum dimethyl complexes with N-(arylimino)pyrroles (Ar = 4-substituted phenyl) in C6D6 at ambient temperature give unlabeled methane and cis methyl complex containing heavily deuterated Pt-Me. In contrast, bulky aryl substituents give methane isotopomers and trans-Pt-Ph product. The origins of these observations are discussed. |
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