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Equivalent Ligands

Last updated

Feb 28, 2022
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- Equatorial Bond
- Erythro

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Equivalent ligands or, more completely, chemically equivalent ligands in an organic molecule are like ligands that have identical chemical properties under all or a specified set of conditions. A test known as the replacement test is used to find if two like ligands in a molecule are equivalent.

eg:

Apply the replacement test to find if the two hydrogen atoms in 1 are equivalent:

Step 1:
Label the two hydrogen atoms in 1 for identification purposes.

Step 2:
Replace H (a) in 1 with a hypothetical atom (X).

Step 3:
Replace H (b) in 1 with the same hypothetical atom, X.

Step 4:
Compare molecules 2 and 3. They are superimposable on each other, meaning that they are identical. Identical molecules have identical chemical properties under all conditions. Since the replacement of H (a) and of H (b) in 1 with the same atom leads to molecules that have identical chemical properties under all conditions, H (a) and H (b) have identical chemical properties under all conditions, i.e., H (a) and H (b) are equivalent under all conditions.

see also homotopic, enantiotopic, diastereotopic, constitutionally heterotopic

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