Question

2. Consider the protons labeled H., H., H., of the compound shown below. Each of these protons are chemically different and are split by at least one other type of proton. coupling constants are shown below. HA HOHC C= "Hc JAB = 15.1 Hz JBC = 6.4 Hz Draw the splitting tree for each proton, H., Ho, and H.

Answer 1

Multiple questions , as per guideline only first will be answered :

2.

These protons have complex coupling pattern :

H_A : it couples H_B which is in trans position to it, coupling constant is 15.1 Hz, which gives doublet of equal intensity 1:1 .( it may couple with H_C with J ~1-2Hz but is data is not given it will not be shown).

Me C Mc -Mc 15-1Hz JBC 4 H2 MA 15-1M2 ИА d сив)

H_B : it couples with H_A and H_C to give a doublet of quartets (dq) : a pattern of two quartets that results from coupling to one proton with a larger J value (J = 15.1 Hz) and three protons with a smaller J value (J= 6.4 Hz).

This is an interesting example of a dq, since characteristic 1:3:3:1 relative intensity patterns of the quartets are obscured by overlap and together result in a 1:3:3:2:3:3:1 pattern.

Terma 3aoclap IS-IM2 (I!S:3:2:331 (Mm) MC

H_C : it couples H_B with coupling constant is 6.4 Hz, which gives doublet of equal intensity 1:1 .( it may couple with H_A with J ~1-2Hz but is data is not given it will not be shown)

6-И Иг Ис ca) ИВ