An Improved Protocol for the Synthesis of [(η4-C4R4)Co(η5-C5H5)] Complexes

Guillaume Bertrand (1, 2) , Ludovic Tortech (3, 4) , Denis Fichou (4) , Max Malacria (2) , Corinne Aubert (2) , Vincent Gandon (5)

1 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
2 IPCM - Institut Parisien de Chimie Moléculaire
3 LICSEN UMR 3685 - Laboratoire Innovation en Chimie des Surfaces et NanoSciences
4 IPCM - Institut Parisien de Chimie Moléculaire
5 ICSN - Institut de Chimie des Substances Naturelles

The reaction of bulky alkynes C2R2 with (η5-C5H5)Co(CO)(dimethyl fumarate) under microwave irradiation provides complexes of the type [(η4-C4R4)Co(η5-C5H5)] in good to excellent yields. This protocol represents a significant improvement over those reported previously. In particular, the formation of insertion products such as cyclopentadienones or cyclohexadienes can be avoided. In addition, because of the exceptional stability of (η5-C5H5)Co(CO)(dimethyl fumarate), the reactions can be carried out in crude solvents. The easy access to [(η4-C4R4)Co(η5-C5H5)] complexes stimulated a study of their reactivity, notably under cross-coupling conditions.

Domaines: Chimie organique

Guillaume Bertrand, Ludovic Tortech, Denis Fichou, Max Malacria, Corinne Aubert, et al.. An Improved Protocol for the Synthesis of [(η4-C4R4)Co(η5-C5H5)] Complexes. Organometallics, 2012, 31 (1), pp.126-132. ⟨10.1021/om200662g⟩. ⟨hal-01397632⟩