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A novel platinum-mediated process involving intermolecular activation of a C(aryl)-H bond of toluene, intramolecular activation of an imine C(aryl)-Cl bond and formation of a C-C bond is reported.

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containing seven-membered platinacycles via "formal insertion" of a toluene molecule in the metallacycle. These compounds are formed in a process involving several steps, the most relevant being intermolecular C-H activation of a solvent toluene molecule and formation of a carbon-carbon bond. The reaction of cis-[PtCl 2 (SOMe 2 ) 2 ] and imine 2,6-Cl 2 C 6 H 3 CHdNCH 2 (4-ClC 6 H 4 ) (1b) under analogous conditions was also carried out using other arene solvents such as benzene and ortho-, meta-, and para-xylene and produced in all cases seven-membered platinacycles. DFT calculations indicate that the stability of the metallacycles increases in the order p-xylyl