Cobalt-Catalysed [6+2] Cycloaddition of Internal Alkynes and Terminal Alkenes with Cycloheptatriene
作者:Gerhard Hilt、Anna Paul、Christoph Hengst
DOI:10.1055/s-0029-1216900
日期:2009.10
cobalt-catalysed [6+2] cycloaddition of cycloheptatriene with internal alkynes as well as with terminal alkenes is described. The cycloaddition process is most efficiently catalysed by cobalt dibromide[bis(triisopropylphosphite)] complexes in dichloromethane as the solvent of choice. In the cobalt-catalysed reaction of cycloheptatriene with norbornene an unexpected tricyclic [2+2] cycloaddition product was