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Wednesday 12 February 2014

Effect of electron donating and withdrawing groups on NMR




LEARN THE PICTURE WAY????????????????

4-Aminophenol

(123-30-8)

1HNMR

4-Aminophenol Structure
arom-H signals appear at 6.4

13 C NMR


SEE WHAT HAPPENS WHEN A NITRO GP APPEARS

4-Nitro-1,3-phenylenediamine

(5131-58-8)

1HNMR

arom-H signal of ortho nitro is at 7.7 downfield than the earlier








A CLASSIC CASE OF ELETRON WITHDRAWING AND DONATING AT OPPOSITE ENDS
........arom-H ortho to nito at  8.09


4- NITRO PHENOL

4-NITROPHENOL SODIUM SALT








SYMMETRICAL MOLECULE,all arom-H are similar





..........................

4-Nitroacetanilide

 


对硝基乙酰苯胺

对硝基乙酰苯胺


 The protons ortho and para to electron donating and electron withdrawing substituents show distinct upfield and downfield shifts.

 
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