2011, Vol.40, No.4
Cycloparaphenylene: Nickel-mediated Synthesis and Crystal Structure
1 Department of Chemistry, Graduate School of Science, Nagoya University
Nickel-mediated synthesis of cycloparaphenylene (CPP) is described. L-shaped diphenylcyclohexane monomers underwent cyclotrimerization under the influence of [Ni(cod)2]/bipy. X-ray crystal-structure analysis and VT NMR analysis of the thus-formed cyclic trimer confirmed its triangle structure and interesting cyclohexane-flipping behavior in solution. Cyclic trimer was converted to CPP by acid-mediated aromatization. The first X-ray crystal structure of CPP is also described.