Petretto, Giacomo Luigi (2009) Reattività di legami C-H in 2,2'-bipiridine promossa da metalli del gruppo del platino. Doctoral Thesis.
2,2’-bipyridines constitute an old and widely studied class of ligands whose most common bonding mode is as N,N neutral chelating donors. In contrast, the so called "rollover cyclometallation" is a rare and particular behaviour which entails a C(3)-H bond activation.
This reaction proceeds, in the case of platinum(II), with a variety of 6-substituted 2,2’-bipyridines.
We report here that under strictly controlled conditions and starting from [Pt(DMSO)2(Me)2] the reaction occurs also with the unsubstituted 2,2’-bipyridine to give both mono- and dinuclear rollover complexes.
The study was articulated as follows:
1) Synthesis of mononuclear "rollover" species [Pt(X)(N’,C(3))(L’)]. (X= Me, Cl; L’ = neutral ligand).
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