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The odd-numbered carbon clusters C 119 , C 129 , and C 139 have been observed in the mass spectra of toluene extracts of fullerene soots and of the products of ozone-fullerene reactions. Specifically, ozone-C 60 reactions yield C 119 , ozone-C 70 reactions yield C 139 , and ozone-(C 60 /C 70 ) reactions produce C 119 , C 129 , and C 139 . These unexpected species correspond to dimers of C 60 , C 60 /C 70 , and C 70 , respectively, less one carbon atom, and are stable gas-phase ions with behavior similar to that of fullerenes. The results suggest a new route to functionalization and derivatization of fullerenes through controlled ozone-catalyzed cage-opening reactions.