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Which carbon will resonate more downfield in this molecule?

muhali3
in Organic Chemistry

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In the picture, will carbon 4 or carbon 6 appear more downfield on a C13 NMR spectrum. They are both one carbon away from a nitrogen, I am guessing 4 but I have no logical reason for this answer.

 

Thanks for the help

molecule.jpg

No 4 should in theory be more downfield as it has 2x N at 2 atoms removed.

No 2 has 1x N at 2 atoms removed.

 

The difference is unlikely to large as these are not primary factors in fieldshift.

Four, count the groups which the carbons are connected to.

Edited by Geo

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