The so-generated C2 can then be trapped in a variety of ways which are highly suggestive of this putative intermediate. Iodonium species are indeed known in the literature as alkynylation reagents, albeit with a proposed mechanism of action for inserting C≡C into molecules that does not involve free C2. Most of the trapping experiments in the present article are reported in solution, with an implied assertion that singlet C2 as a discrete species is insufficiently reactive to be captured by solvent rather than by a chemical trap. One experiment is claimed to produce C2 gas, but in this case the implication is that the C2 is insufficiently reactive to be trapped by the fritted glass filter through which it must pass.