Comments on: 13-C NMR – How Many Signals

By: James Ashenhurst

James Ashenhurst — Wed, 17 Sep 2025 00:39:32 +0000

Oh – yes. Should have 9, not 8. Yes, the two methyl groups are identical. Will fix within 24h. Thank you!

By: Broderick Clark

Broderick Clark — Tue, 16 Sep 2025 21:06:08 +0000

Would camphor have 9 signals? If only the bridged carbon’s methyl groups are identical that would make 9 total.

By: James Ashenhurst

James Ashenhurst — Fri, 14 Feb 2025 10:56:40 +0000

In reply to Camden Parks. Thanks for the spot! Much appreciated!

By: James Ashenhurst

James Ashenhurst — Fri, 14 Feb 2025 10:56:25 +0000

In reply to Elizabeth A.. You are correct. Sorry about that, will fix right now.

By: Camden Parks

Camden Parks — Thu, 13 Feb 2025 21:11:35 +0000

I believe you have a typo on the fourth one in the last set of structures: your color-coding indicates that there should be two signals, but it is labeled as “3 signals”.

By: Elizabeth A.

Elizabeth A. — Thu, 29 Feb 2024 19:10:59 +0000

Hi James,
I’m reviewing for my organic chemistry class and greatly appreciate all the articles you’ve made, they make for great study material (alongside the mini quizzes at the end of sections!).
In the last images before the Notes, the 4th displayed molecule (4 carbons, 2 carbonyl groups and 2 amine groups across a vertical plane of symmetry) is said to produce 3 signals. I am lead to believe that this is supposed to be 2 signals, though? Even in the diagram under the “Answer” column, the two carbon molecules are labeled 1 and 2, there is no third unsymmetrical/additonal carbon.
This isn’t a vital question, but I figured I’d make sure. Thanks again.
Stay safe.

By: SWAPNIL BIRADAR

SWAPNIL BIRADAR — Mon, 22 Aug 2022 11:37:52 +0000

NICE MAKE SOME REVIEW ON MASS FRAGMENTATION ALSO