Los puntos clave no están disponibles para este artículo en este momento.
More than 100 years after the cyclopentadienyl anion appeared in the literature, the first cyclopentadienyl cation, the pentamethyl derivative C5Me5+, has now been prepared in a single step as the tetrakis(pentafluorophenyl)borate salt. This material is crystalline and stable at room temperature for weeks. The crystal structure of C5Me5+ (see picture) reveals localized bonding.
Lambert et al. (Mon,) studied this question.