HNMR Splitting Patterns

[@VictortheOrganicChemistryTutor]

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[@sxkonwxn]

I am a student in Thailand. I am not very good at listening to English but I can understand the main points. You helped me understand NMR more. Thank you.

[@VictortheOrganicChemistryTutor]

Glad it was helpful!

[@colinwang3542]

Limitation to the N+1 rules: it is only reliable if all of the neighbor hydrogens are equivalent. Fortunately, in the examples you gave in this video, the coupling constants of the two groups of inequivalent hydrogens are equal. The H-NMR of acryloyl chloride may make it more clear.

[@VictortheOrganicChemistryTutor]

"Equivalent" is not quite the correct word here. But yeah, "n + 1" is certainly not a universal rule. Probably the better term here is the same "type" and molecule shouldn't have any steric shenanigans going on like conformational locks or extra rigidity and then even the "same type" hydrogens can give complex splitting due to the bond alignments in space. I didn't want to make this video too long, so I didn't talk about the coupling constants and complex splitting. It's gonna be a separate video since not every sophomore ochem course even covers it.

[@shiralevizecchillo9654]

It’s just amazing so well explained

[@VictortheOrganicChemistryTutor]

Thank you! I'm glad you found this video helpful!

[@NkosuNfanseh]

Hey Victor, that you so much for this video, it was so on point. Please can you drop one for CNmr🙏

[@VictortheOrganicChemistryTutor]

I do have an overview video where I briefly talk about CNMR but yeah, a dedicated CNMR video is in my plans.

[@ryryhc]

9:33, how come in set C you used the (n+1) rule rather than the (n+1)(m+1) since its being coupled by both the CH3 group and the CH2 group?

[@VictortheOrganicChemistryTutor]

Same coupling constant from both sides, so a simple first-order coupling.