Question

In the acetyl ferrocene NMR spectrum, how could you tell which peak(s) belong to the acetylated ring, and which peaks belong to the non-acetylated ring?

In the diacetylferrocene NMR spectrum, how could you predict which peak corresponds to the Hs adjacent to the acetyl group, and which peak corresponds to the aromatic Hs further away from the acetyl group?

Answer 1

non acylated Ring's Hydrogen will have lower chemical shift than acylated Ring's Hydrogen because acylated Ring's Hydrogen are more deshielded because of presence of electron withdrawing acyl group.

In acylated ring hydrogens which are adjacent to acyl group are more deshielded than those which are further away from acyl group because acyl group will have less effect for those which are far away.