Density functional computations showed, in contrast to general assumptions, that reactions at the 7-7 ring fusions of Stone-Wales defects in the side-walls of armchair (5,5) single-wall carbon nanotubes were much less exothermic than reactions at perfect sites. In addition, the peripheral 5-6 and 6-7 ring fusions of the defect were much more reactive.

Are Stone-Wales Defect Sites Always More Reactive Than Perfect Sites in the Sidewalls of Single-Wall Carbon Nanotubes? X.Lu, Z.Chen, P.V.R.Schleyer: Journal of the American Chemical Society, 2005, 127[1], 20-1