Journal of the American Chemical Society p. 1514 - 1532 (1995)
Update date:2022-08-04
Topics:
Mitchell, Reginald H.
Iyer, Vivekanantan S.
Khalifa, Nasr
Mahadevan, Ramanathan
Venugopalan, Santhanagopalan
Weerawarna, Sirimevan Ananda
Zhou, Pengzu
The synthesis of 13 trans-dimethyldihydropyrenes (bridged [14]annulenes) fused to one or more benzene, naphthalene, phenanthrene, phenalene, or quinoxaline rings and 6 cis-dihydropyrene derivatives from benzenoid precursors using either a thiacyclophane route or an electrocyclic addition of a furan to an annulyne followed by deoxygenation is reported. Their 1H NMR spectra are studied in detail to obtain correlations between 3JH,H coupling constants and the internal methyl proton chemical shifts and also between the latter and the more distant external annulene ring proton shifts. These linear correlations are then used to obtain a relationship between the relative aromaticity of benzene and the fused ring in question, such that the aromaticity of the fused ring can be estimated relative to that of a benzene ring simply from a measurement of chemical shift in the fused annulene.
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