Cyclotrimerization of alkynes with [60]fullerene in the presence of tricyclohexylphosphine

Abstract

Treatment of [60]fullerene with HCCCO₂R in the presence of P(Cy)₃ at ambient temperature affords a cyclotrimerization product (R = Et, 1; Me, 2) which results from a head-to-tail addition of two HCCCO₂R units to a 6–6 ring junction of [60]fullerene based on the observed spectral data.