Synthesis of isomeric phenyleneethynylene dendrons and their incorporation in fullerene-based dyads

Two series of isomeric dyads with differently branched phenyleneethynylene-based moieties and a pyrrolidinofullerene core have been prepared. The synthetic approach to prepare these compounds relies upon the 1,3-dipolar cycloaddition of an azomethine ylide generated in situ from the corresponding aldehydes and N-methylglycine.