Coupling question regarding 3 bond rule

[MediCynical]

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R-CH2-NH-R

The hydrogens attached to the carbon would not split the hydrogen attached to the nitrogen (and vice versa), correct? Does the 3-bond rule only include bonds between C-H and C-C?

 

[TieuBachHo]

Nevermind.

 

[PiBond]

R-CH2-NH-R

The hydrogens attached to the carbon would not split the hydrogen attached to the nitrogen (and vice versa), correct? Does the 3-bond rule only include bonds between C-H and C-C?

generally, splitting doesn't occur through electronegative atoms

 

[TieuBachHo]

generally, splitting doesn't occur through electronegative atoms

Would you elaborate on this? I can understand why it doesn't apply to groups like -OH and such but as a general rule I fail to see how this happens. Not trying to be a smart-azz though but I'm really confounded by this 😀. I understand the deshielding effect but not the splitting rule. Thanks.