title: Synthesis of 1,8,9,16-tetrakis(trimethylsilyl)tetra-cata-tetrabenzoquadrannulene.
abstract: The synthetic efforts that yielded the first stable [4]circulene, 1,8,9,16-tetrakis(trimethylsilyl)tetra-cata-tetrabenzoquadrannulene (TMS(4)-TBQ, 1), are reported. The synthesis and characterization of different intermediates are described. The cyclotrimerization of the key precursor tetraalkyne was explored using Rh(I), Ni(0), and Co(I) catalysts. The ultimate product 1 was isolated only after oxidative demetalation of cobalt complexes.
authors.affiliation: Department of Chemistry, University of Nevada, Reno, Nevada 89557-0216, USA.
authors.forename: Bharat
authors.initials: B
authors.lastname: Kumar
authors.forename: Benjamin T
authors.initials: BT
authors.lastname: King