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Topic: DEPT-135 assigning the peaks  (Read 595 times)

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Offline AussieKenDoll

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DEPT-135 assigning the peaks
« on: July 23, 2020, 07:33:59 AM »
Why is the CH3 ( -Methyl) of 6 has lower chemical shift than methyl of 1 on the DEPT-135 spectrum attached?
Since methyl number 6 is near the electronegative atom Oxygen, it should be de-shielded more than methyl number 1. But this spectrum peak assignment is confusing!
Can you please explain why?

This is from the Introduction to spectroscopy by Pavia page 595.
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