Synthesis of New Cyclopentenofullerenes Containing a Norbornene Fragment

ab]Abstract

Endic acid imides were synthesized by direct fusion of endic anhydride with various amino acids. Further transformations of the resulting acids gave new 2,3-dienoic acids containing a norbornene fragment. Triphenylphosphine-catalyzed [3+2]-cycloaddition of the latter to fullerene C₆₀ afforded the corresponding cyclopentenofullerenes.