proposed that the very effective trapping of the triphenylcyclopropenyl anion 4 by cyclopropenyl cation 1 proceeds by an electron transfer, with large collisional cross-section, followed by coupling of the resulting radicals. This suggestion was based on the observation that capture of the cyclopropenyl carbanion 4 by the cation 1 was much more effective than capture by protonation with guanidinium cation, even though this species was in 100-fold ...
