Get access

An Intermolecular Double [2+2] Cyclodimerization of a Tetraalkyne


  • We thank the Nuffield Foundation, the EPSRC, and the University of Bath for financial assistance.


original image

Double take: An intermolecular double [2+2] cyclodimerization of vinylidene bisalkynes gives an air-stable organometallic complex with an extraordinary ligand motif (see scheme). The central six-membered ring has all sp2-hybridized carbon atoms and two exocyclic double bonds, and is a stable de-aromatized analogue of p-xylene.