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The chemistry of organometallic palladium complexes is largely dominated by the 0 and +II metal’s oxidation states due to their central relevance in cross-coupling transformations.[1] However, higher oxidations states of the metal are being explored in the effort to access previously precluded transformations and to unveil unprecedented reactivity at the metal centre.[2,3]
The coordination of an ytterbium centre to an alkyl-Pd(IV) species through a redox non-innocent ligand dramatically improves the stability of the resulting complexes.[4,5] However, owing to the presence of labile ligands as halides, such compounds are still susceptible to undergo easy R.E. processes.[4]
Following this effort, here we present the synthesis of an ytterbium-stabilized alkyl-Pd(IV) species bearing four methyl groups at the palladium centre. Such complex proved to be dramatically more stable than its tris-methylated counterparts, with a half-life time in solution of 11 hours at 20°C. Taking full advantage of the increased lifespan in solution of the resulting complex, its unprecedented reactivity with light is explored.
[1] Seechurn, C. C. C. J.; Kitching, M. O.; Colacot, T. J.; Snieckus V. Angew. Chem. Int. Ed. 2012, 51, 5062-5085.
[2] Sehnal, P.; Taylor, R. J. K.; Fairlamb, I. J. S. Chem. Rev. 2010, 110, 824-889.
[3] Xu, L.-M.; Li, B.-J.; Yang, Z.; Shi, Z.-J. Chem. Rev. Soc. 2010, 39, 712-733.
[4] Goudy, V.; Jaoul, A.; Cordier, M.; Clavaguéra, C.; Nocton, G. J. Am. Chem. Soc. 2017, 139 (31), 10633–10636.
[5] Nocton, G.; Lukens, W. W.; Booth, C. H.; Rozenel, S. S.; Medling, S. A.; Maron, L.; Andersen, R., J. Am. Chem. Soc. 2014, 136 (24), 8626 – 8641.
