S'21 - NMR 14 - J values (coupling constants)
Автор: Chem240_DJS
Загружено: 2021-02-04
Просмотров: 677
Описание:
J-values... tell you the KIND of relationship between two groups...
...like, say: "this H is bound to this C DIRECTLY"... or "this H is trans to this other H" or "these two H's are bound to the same sp2 C"...
...as long as you have a rough feel for typical J-value ranges.
Extracting the J's from a spectra is its own complicated process... but this video is about knowing what you're looking at... and exploring J's within the context of ethyl vinyl ether.
Timestamps:
0:00 - J-values, vicinal alkyl... "boring normal"
1:20 - Why do protons couple?
1:58 - the 13C NMR couplings and energies
3:26 - straight chain alkane J's
4:14 - geminal alkyl J's "diastereotopic"
5:06 - double-bonds and J's
6:58 - 4-bond couplings aren't a thing w/o double bonds... but with them...
8:40 - predicting ethyl vinyl ether
9:04 - integrals and shifts
9:22 - J's expected
10:34 - assigning in the spectrum, without J's
10:56 - alkyl side J's ~7 Hz
11:35 - analyzing the doublets of doublets (db H's)
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