So I would suspect the aldehyde hydrogen on 3-fluorobenzaldehyde to be a singlet right? The adjacent carbon has no hydrogens attached. But the
ChemAxon chemicalize calculator says that would be a triplet:
Why? Is this something to do with the conjugated system?DraconicAcid - 4-10-2020 at 22:55
Yes, you can sometimes get what is called "W-coupling".thors.lab - 5-10-2020 at 06:42
Yes, you can sometimes get what is called "W-coupling".
Awesome, thank you!AvBaeyer - 5-10-2020 at 18:10
The multiplicity is a result of long distance coupling with the fluorine atom. H-F couplings occur through several bonds. Any good NMR text will give
you an explanation with examples.
The multiplicity is a result of long distance coupling with the fluorine atom. H-F couplings occur through several bonds. Any good NMR text will give
you an explanation with examples.
AvB
No, because it's a triplet. If it was coupling to the F, it would be a doublet.Sigmatropic - 6-10-2020 at 10:03
W coupling would be 4J, in this example it is 5J. So no W coupling. Also in reality it is a doublet, see attachment, so I second avbaeyer. Source:Sigma aldrich
Attachment: FNMR010527.PDF (99kB) This file has been downloaded 238 times
