A thermodynamic investigation of {cobalt (II) bromide + acetonitrile} and {cobalt (II) bromide + propionitrile}

Ligand and solvent effects on cobalt(I)-catalysed reactions: Alkyne dimerisation versus [2+2+2]-cyclotrimerisation versus Diels–Alder reaction versus [4+2+2]-cycloaddition

“…Surprisingly, the reaction can be performed even with CoBr 2 in acetonitrile without any additional ligands. The regioisomeric ratio in this case is 18.6:1.0 clearly indicating an important part of this solvent in the mechanism as CN) x ] was obtained [10]. This complex was used as a pre-catalyst in dichloromethane to yield 75% of the trimerisation products (2:3 = 5.3:1.0) which were isolated after 16 h reaction time.…”