Explain briefly this observation of chemical shift for these aliphatic protons indicated with an arrow. -0.5...

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Explain briefly this observation of chemical shift for these aliphatic protons indicated with an arrow. -0.5 ppm H2C

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Answer 1

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This phenomenona of Very high shielding is explained by DIAMAGNETIC ANISTROPY .

It is usually seen in Aromatic compounds or compounds having Pi electrons .

The circulation of pi electrons in above aromatic system generate a secondary magnetic field which opposes applied field magnetic field and hence this CH2 protons are highly shielded . All other protons are highly deshielded because they reinforce the applied field via Anisotropy effect .

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Explain briefly this observation of chemical shift for these aliphatic protons indicated with an arrow. -0.5...

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