In the context of transition metal catalysis, what is the precise formal oxidation state of the metallic copper catalyst specifically introduced into the reaction vessel at the initiation step of the

Question

In the context of transition metal catalysis, what is the precise formal oxidation state of the metallic copper catalyst specifically introduced into the reaction vessel at the initiation step of the Gattermann reaction?

Prashant Kotian · Accepted Answer

Correct answer: 0. Unlike the Sandmeyer reaction, which introduces copper already in the oxidation state (as cuprous halide), the Gattermann reaction specifically mandates the addition of finely divided elemental copper powder. Elemental metals in their standard state have a formal oxidation state of . The copper powder undergoes *in situ* oxidation during the electron-transfer steps that reduce the diazonium ion to an aryl radical.

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