Goettl SJ, Turner AM, Sun BJ, Chang AHH, Hemberger P, Kaiser RI. Gas-phase preparation of the dibenzo[
e,l]pyrene (C
24H
14) butterfly molecule
via a phenyl radical-mediated ring annulation.
Chem Commun (Camb) 2024;
60:1404-1407. [PMID:
38174640 DOI:
10.1039/d3cc05371g]
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Abstract
A high temperature phenyl-mediated addition-cyclization-dehydrogenation mechanism to form peri-fused polycyclic aromatic hydrocarbon (PAH) derivatives-illustrated through the formation of dibenzo[e,l]pyrene (C24H14)-is explored through a gas-phase reaction of the phenyl radical (C6H5˙) with triphenylene (C18H12) utilizing photoelectron photoion coincidence spectroscopy (PEPICO) combined with electronic structure calculations. Low-lying vibrational modes of dibenzo[e,l]pyrene exhibit out-of-plane bending and are easily populated in high temperature environments such as combustion flames and circumstellar envelopes of carbon stars, thus stressing dibenzo[e,l]pyrene as a strong target for far-IR astronomical surveys.
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