Aromatic Heterocycles Video Lessons

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Problem: Indicate whether or not each of the following structures is considered to be aromatic.a) A is aromatic, B is not.b) B is aromatic, A is not. c) Both A and B are aromatic. d) A and B are not aromatic. 

FREE Expert Solution

For aromatic heteroatoms, lone pairs of the heteroatom can be donated if 

1. They are already sp3 hybridized

2. It will help create aromaticity


For a. 

  • N is sp3 however, no lone pairs is available so the heteroatom will not continue the conjugation

This makes the compound non-aromatic


For b.

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Problem Details

Indicate whether or not each of the following structures is considered to be aromatic.

a) A is aromatic, B is not.

b) B is aromatic, A is not. 

c) Both A and B are aromatic. 

d) A and B are not aromatic. 

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Based on our data, we think this problem is relevant for Professor Nareddy's class at SCAR.