title: PCy3-catalyzed ring expansion of aziridinofullerenes with CO2 and aryl isocyanates: evidence for a two consecutive nucleophilic substitution pathway on the fullerene cage.
abstract: A PCy3-catalyzed ring-expansion reaction of aziridine-fused fullerenes (aziridinofullerenes) through the insertion of CO2 and aryl isocyanates is disclosed. The reaction allows for CO2 fixation by aziridinofullerenes, producing oxazolidinone-fused fullerenes (oxazolidinofullerenes) in high yields, whereas treatment with aryl isocyanates led to a new fullerene family-imidazolidinone-fused fullerenes (imidazolidinofullerenes)-in good to high yields. Furthermore, a mechanistically related unprecedented fullerenyl phosphonium salt was successfully isolated. Using the isolated salt, mechanistic studies were also investigated.
authors: Frontier Research Base for Global Young Researchers, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871 (Japan); Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871 (Japan).
authors: Youhei
authors: Y
authors: Takeda
authors: Hajime
authors: H
authors: Kawai
authors: Satoshi
authors: S
authors: Minakata
keywords: Lewis bases; carbon dioxide fixation; fullerenes; organocatalysis; ring expansion