Nitration of 2-t-Butylpyrene and 2,7-di-t-butylpyrene leads to nitro derivatives which show an extremely weak interaction between the nitro group and the aromatic π-system; the orientation of the nitro group prevents this group from conjugation with the π-system, leading to an unperturbed pyrene electronic spectrum.
L. Rodenburg, R. Brandsma, C. Tintel, J. Cornelisse and J. Lugtenburg, J. Chem. Soc., Chem. Commun., 1983, 1039 DOI: 10.1039/C39830001039
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