New cascade processes on group 6 Fischer-type carbene complexes: cyclopropanation and metathesis reactions.
Alkynyl Fischer carbene complexes 1, which feature a pendant olefin group, undergo novel cascade processes triggered by [2+2], [3+2], and [4+2] cycloadditions. Competition between cyclopropanation and olefin metathesis is controlled by the substitution at the double bond. The method described can be used to obtain different kind of polycarbo- and -heterocycles. A mechanistic explanation by means of DFT computational modeling is provided.
Barluenga
José
J
Instituto Universitario de Química OrganometAlica Enrique Moles, Unidad Asociada al CSIC, Universidad de Oviedo, JuliAn Clavería 8, 33071 Oviedo, Spain. barluenga@uniovi.es
Andina
Facundo
F
Aznar
Fernando
F
Valdés
Carlos
C