Question

46) Identify relation between both hydrogens.
H
H
H3C
CH3
a) enantiotopic
b) Homotopic
c) Diastereotopic
d) heterotopic​

Answer 1

Answer:

1)Homotopic Protons

Homotopic, simply means identical. For example, all the protons in ethane are homotopic. Even tough each proton is physically different, but we say that they are identical because the rotation about the C-C single bond is so fast that averagely speaking all the protons appear in the same environment.

There is also an operation that can be done to check the relationship two protons in the molecule. If replacing two protons with a different group (X) gives the same compound, the protons are called Homotopic.

2)Diastereotopic Protons

The most common set of nonequivalent protons that you will hear bout in your course is going to be the diastereotopic protons.

If replacing two protons with a different group (X) gives a pair of diastereomers, the protons are called Diastereotopic.

3)Heterotopic Protons

There one more case scenario – What if neither a plane nor an axis of symmetry reflects two protons and they are not stereochemically related?

In this case, they are still chemically not equivalent but specifically, these are a pair of (constitutionally) heterotopic protons.

4 enantiotopic protons

If replacing two protons with a different group (X) gives a pair of enantiomers, the protons are called Enantiotopic.

Explanation:

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