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This investigation was funded by the DFG priority program 1118 focussing on the activation of unreactive substrates via secondary ligand substrate interactions. The present account discusses a selection of our results in the context of the work of other groups. 1 Properties of the Guanidine Functionality The most prominent feature of a guanidine base is its pronounced proton acceptor character. Peralkyl guanidines, in particular, are among the strongest purely organic neutral bases known. 00. 62 [3].

Grimme, S. W. (2007) Chemical Communications, 5072. , Schorm, A. and Sundermeyer, J. (2000) Zeitschrift Fur Anorganische Und Allgemeine Chemie, 626, 1583. , Plackmeyer, J. and Sundermeyer, J. (2001) European Journal of Inorganic Chemistry, 1937. , Saak, W. and Henkel, G. (2000) Journal of The Chemical Society-Dalton Transactions, 3473. , Kipke, J. and Sundermeyer, J. (2001) Inorganic Chemistry, 40, 6964. , Merz, M. and Sundermeyer, J. (2001) Journal of Molecular Catalysis AChemical, 175, 51. , Sundermeyer, J.

8 Formation and degradation pathways of a proposed mononuclear oxo species [(DMEG3tren)Cu(O)]þ . Molecular structure of [(DMEG3trenO)Cu]ClO4ÁH2O. It is plausible that the oxidants, solvated PhIO(MeCN)n or TsN3, are activated via electron transfer from Cu(I). This might proceed either via an inner-sphere mechanism and a Cu(I) precoordinated oxidant or via an outer-sphere mechanism. The result of a single-electron transfer would be the formation of oxidant radical anions coordinated to Cu(II) and elimination of stable leaving groups N2 or PhI.

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