The Synthesis of a Dicyclopenta[a,e]pentalene via a Molybdenum Hexacarbonyl-Mediated Tandem Allenic Pauson−Khand Reaction

An approach to the 14π annulene has been developed, by employing the molybdenum hexacarbonyl-mediated tandem allenic Pauson−Khand reaction as a key step. A di-triisopropylsilyl substituted dicyclopenta[a,e]pentalene was synthesized. This 14π annulene showed some electronic delocalization, which was not observed in previous cases.