jo3015648_si_001.cif (31.31 kB)

Synthesis of 1,8,9,16-Tetrakis(trimethylsilyl)tetra-cata-tetrabenzoquadrannulene

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posted on 07.12.2012, 00:00 by Bharat Kumar, Benjamin T. King
The synthetic efforts that yielded the first stable [4]­circulene, 1,8,9,16-tetrakis­(trimethylsilyl)­tetra-cata-tetrabenzoquadrannulene (TMS4-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.