Thanks for clearing up the J coupling I was seeing. I had a proton NMR and was trying to figure out what was that J value I measured and calculated from 2 peaks that were really close to each other in the 7.4 ppm chemical shift area, which was 8, but I was expecting a different number, 3.
And according to my references, 3J = 8 refers to ortho-substituted benzene ring and 3J = 3 refers to a meta-substituted benzene ring, but results are results. Now that I know which one is coupled to what, I'm almost good to go.
Is it possible to "see" longer ranged couplings on a proton NMR? Maybe over 4 or 5 bonds on an aromatic ring?
Like, would I see coupling between H1b and H1a ?
And what about coupling between H1b and H2a ?