Abstract
Rolling up: Larger acenes are potential carriers of diffuse interstellar bands, and should undergo dehydrogenation reactions upon absorption of interstellar UV photons. This could result in 2,3-didehydroacenes that have a reactive aryne functionality at one of the short ends of the long molecule. The intramolecular Diels-Alder reaction to dihydroethenocyclacenes with the other end of the acene and the subsequent cycloreversion of acetylene were studied computationally and were shown to have energy requirements that are compatible with cyclacene formation under the extreme conditions of interstellar space. More information can be found in the Full Paper by H. F. Bettinger et al. on page 4605.
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