Roll-over cyclometalation: A versatile tool to enhance the catalytic activity of transition metal complexes

Publication date: Available online 19 March 2018 Source:Journal of Organometallic Chemistry Author(s): Marko Leist, Christian Kerner, Leila Taghizadeh Ghoochany, Saeid Farsadpour, Agnes Fizia, Jens P. Neu, Florian Schön, Yu Sun, Benjamin Oelkers, Johannes Lang, Fabian Menges, Gereon Niedner-Schatteburg, Kifah S.M. Salih, Werner R. Thiel Roll-over cyclometalation is a special case of cyclometalation. While in classical cyclometalation, C,H-activation (deprotonation or oxidative addition) has to occur at the ligand to result in a metallacycle, in roll-over cyclometalation the ligand in principle has the chance to undergo chelating coordination without cleavage of a C-H bond (e.g. κ2-N,N′- vs. κ2-C,N-coordination at 2,2′-bipyridines). Nature thus can decide for which route shall be followed. In this review, the basic parameters for bringing a system into roll-over cyclometalation are discussed, followed by an overview on compounds that have been published in this field during the last years. The focus however is laid on applications of roll-over cyclometalation in catalysis, a rather new field in coordination and organometallic chemistry. Graphical abstract

Source: Journal of Organometallic Chemistry - March 20, 2018 Category: Chemistry Source Type: research