Question
With the help of suitable diagrams explain the rearrangement of the cis enantiomer by the bond rupture mechanism involving a trigonal bipyramidal intermediate.
Answer :
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The cis square-planar complex of the type cis-[Mabcd] may exist as a pair of enantiomers due to the unsymmetrical arrangement of ligands around the metal centre. Interconversion of these enantiomers can occur through a bond rupture mechanism that proceeds via a trigonal bipyramidal intermediate. In this mechanism, one metal–ligand bond in the square-planar complex is weakened and partially broken, allowing the coordination number of the metal to increase transiently. Initially, the cis square-planar complex undergoes axial approach of one ligand, resulting in the formation of a five-coordinate trigonal bipyramidal intermediate. In this intermediate, three ligands occupy equatorial positions and
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