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Explain why lower oxidation state late transition metal complexes are good at breaking the H-H bond,...

Explain why lower oxidation state late transition metal complexes are good at breaking the H-H bond, but in general main group and early transition metal complexes are not.

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Answer #1

Conditions for oxidative addition reactions are 1. Metal should be electron rich 2. Low valent metal 3. Sterically unhindered metal 4. Easily disassociating ligand 5. Low X-Y bond dissociation energy.

Latter transition Metals are electron rich and have capability to show variable oxidation state .

Generally 16 & 17 electron complexes will easily undergo oxidative addition reactions to get stability by the formation of 18 electron complexes .

But for main group and early transition elements are not electron rich hence they will not participate in oxidative addition reactions.

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