1,2,3,4-Tetraethynylbenzene as a Template for Cobalt-Catalyzed Alkyne Cocyclizations: Synthesis of 2,3,8,9-Tetrakis(trimethylsilyl) Angular [3]Phenylene and Bent [5]Phenylene (Benzo[1′′,2′′:3,4;3′′,4′′:3′,4′]dicyclobuta[1,2-b:1′,2′-b′]bisbiphenylene) - Mohler, Debra L; Kumaraswamy, Sriram; Stanger, Amnon; Vollhardt, K Peter C (Synlett, 2006)