Syntheses of Acetyl-1-bromopyrenes

Abstract The reaction of 1-bromopyrene with acetic anhydride in the presence of aluminium chloride afforded an ipso-substituted compound, 1-acetylpyrene, in addition to the expected compounds, 6-acetyl- and 8-acetyl-1-bromopyrene. 7-Acetyl-1-bromopyrene was prepared via the acetylation of 2-acetylamino-1-bromo-4,5,9,10-tetrahydropyrene. The structures of the acetylbromopyrenes were assigned according to the two-dimensional NMR spectra.