Synthesis of Isomerically Pure Organodihydrofullerenes

Abstract
Controlled two‐step nucleophilic hydroalkylations, hydroar‐ylations as well as hydrostannylations of fullerene‐60 (1) and fullerene‐70 (2) lead to defined organodihydrofullerenes C60HR and C70HR. NMR investigations show that only one isomer of each organodihydrofullerene with Cs symmetry is formed. In all cases the addition takes place at a double bond separating two six‐membered rings of the fullerene core. In this way a variety of organodihydrofullerenes also carrying functional groups have been synthesized.