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The bridged (14)annulene dimethyldihydropyrene (1) aromatic ring current probe, was used to examine the bond localization effects of tricarbonylchromiumbenzene (37) hexamethylbenzenerutheniumbenzene (38), tricarbonylmanganesecyclopentadienyl (4) and pentamethylcyclopentadienylrutheniumcyclopentadienyl (39), when fused to the annulene. The H NMR spectra for each compound was given detailed analysis regarding the ring current shielding of the internal methyl protons and external protons. Diamagnetic anisotropy effects were removed using the McGlinchey equation.

Two synthetic techniques help convert benzenoid precursors into 13trans-dimethyldihydropyrenes fused to one or more benzene, quinoxaline rings, phenanthrene, phenalene or naphthalene, and 6 cis-dihydropyrene derivatives. A combination of 1H NMR spectra and J(H-H) coupling constants helps compare the aromaticity of the fused ring relative to benzene. The chemical shifts of the internal methyl protons exhibit a significant correlation with distant nonsterically affected external ring protons.

Investigates the bond localization effects of the organometallic species tricarbonylchromiumbenzene, using aromatic ring current probe, the bridge [14] annulene dimethyldihydropyrene. Examination of change in chemical shifts that occur between 4 and 2; Details on experiments conducted in the study; Findings of relative bond fixing ability of the organometallics.