Flash vacuum thermolysis (FVT) of 1-chloro-1-(pyren-1-yl)ethene at 1000 °C gives the combustion emittant cyclopenta[c,d]pyrene in good yields; the identification of 1-(pyren-1-yl)ethyne as an intermediate in the range 600–900 °C indicates that cyclopenta[c,d]pyrene is formed via an ethynyl–ethylidene carbene rearrangement.
M. Sarobe, J. W. Zwikker, J. D. Snoeijer, U. E. Wiersum and L. W. Jenneskens, J. Chem. Soc., Chem. Commun., 1994, 89 DOI: 10.1039/C39940000089
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