# Which of the following reactions do square planar complexes undergo?

## a) oxidative addition b) substitution c) ligand dissociation d) migratory insertion

Aug 14, 2017

If the transition metal has a low oxidation state, the square planar complex generally undergoes oxidative addition, as it is easy to oxidize a metal with a low oxidation state.

Square planar complexes generally only undergo:

• oxidative addition reactions to form higher-coordinate complexes (octahedral products are common), if the oxidation state of the central metal is low.

For example:

• substitution reactions under an associative interchange mechanism, ${I}_{a}$, if the oxidation state of the central metal is not low.

For example:

On the other hand...

• ligand dissociation tends to occur in complexes that are 5- or 6-coordinate, though it is possible for it to be an intermediate step in a longer reaction.

For example:

• migratory insertion generally occurs in complexes where ligands are cis to each other, often seen in octahedral complexes.

For example:

• reductive elimination is generally seen in 5- or 6-coordinate complexes with central metals of high oxidation states.

For example: