Steric Enhancement of Resonance*
M. Krishna Pillay* and M. Seenimubarak
Department of Chemistry, Bharathidasan University, Tiruchirapalli 620 024 Tamil Nadu, India.
Some of the literature data are interpreted In favour of the newer phenomena of Steric Enhancement of Resonance (SBR). The mcsomeric moment (Δμ) of 2,4-dinitro-anisolc is very significant, 0.87 D which can only be accounted due to the extended conjugation between the -OCH3 group and 4-NO2 group. The spin-spin coupling constants between methyl protons (of-OCH3) and the benzene ring proton (JOHCH3=5J) of suitably Subsituted anisoles arc found to support SER. From this study one may be convinced that an ortho subsituent does not sterically inhibit methoxyl group from conjugating with an electron-withdrawing group in 4-position rather enhance the conjugative interaction.
KEYWORDS:Enhancement; Resonance; (JOHCH3=5J)
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