A new synthon for the incorporation of [60]fullerene in macrocycles
Abstract
A bis(methano)fullerenedicarboxylic acid was obtained in four steps from C60 as a new synthon for incorporation of the carbon sphere into macrocycles; the preparation of the target compound involves the tether-directed synthesis of a macrocyclic cis-2 bis(malonic acid diester) adduct of C60, followed by selective ester deprotection, decarboxylation of the formed bis(malonic acid monoester) and removal of the tether.