Abstract
Benzo[e]-, naphtho[e]- and anthro[e]-fused 2,7-di- t-butyl- trans-10b,10c-dimethyldihydropyrenes are synthesized via an ‘aryne–furan’ Diels–Alder reaction and the series used to establish a relative aromaticity scale for estimating resonance energies (bond localization energies) using NMR chemical shift data of the internal methyl protons of the dihydropyrenes.
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