title: 1,3,6,9,12,14,17,20-octaethynyltetrabenz[a,b,f,j,k,o]-4,5,10,11,15,16,21,22- octadehydro[18]annulene: a carbon-rich hydrocarbon.
abstract: Dodecaynes 1a-d have been prepared via a convergent strategy that employs Sonogashira couplings as the carbon-carbon bond-forming tool. Due to the steric bulk of the DMTS groups, 1c adopts a nonplanar conformation, the dynamics of which have been probed by VT-NMR. The cobalt-catalyzed isomerization of 1a,b produced the new conjugated phenylenes 2a,b and 3a,b, respectively. [structure: see text]
authors.affiliation: Center for New Directions in Organic Synthesis, Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720-1460, USA.
authors.forename: Ognjen S
authors.initials: OS
authors.lastname: Miljanić
authors.forename: Daniel
authors.initials: D
authors.lastname: Holmes
authors.forename: K Peter C
authors.initials: KP
authors.lastname: Vollhardt