CpRuCl- and CpCo-catalyzed or mediated cyclotrimerizations of alkynes and [2+2+2] cycloadditions of alkynes to alkenes: A comparative DFT study

Computational methods have been used to better understand both the CpRuCl- and CpCo-catalyzed and mediated cyclotrimerization of alkynes and the [2+2+2] cycloaddition of alkynes to alkenes. These studies have allowed more accurate mechanisms to be proposed for each of these transformations and for some previously proposed intermediates to be discarded. The mechanistic rationale of these processes depends on the nature of the metal, ligands and substrate partners. (C) 2008 Elsevier B. V. All rights reserved.