Organic Reaction Mechanism

Ligand addition and dissociation
In an addition, the total electron count of the metal increases by 2, but the d electron count and the oxidation state do not change
Deprotonation of M-H
the total electron count doesn’t change, and its oxidation state decreases by 2
protonation of a metal
gives a metal hydride in a higher oxidation state
oxidative addition of a metal
the metal inserts itself into an X-Y bond, the X-Y bond is broken and M-X and M-Y bonds are formed. the metal’s oxidative state increases by 2, its d electron count decreases by 2 and its total electron count increases by 2, becomes less electron-deficient
oxidative addition of a metal
the metal inserts itself into an X-Y bond, the X-Y bond is broken and M-X and M-Y bonds are formed
reductive elimination
X-M-Y becomes M + X-Y, X Y are adjacent and the total electron count decreases, oxidation state decreases, but an increase in the d electron count
insertion
M-X + A=B becomes M-A-B-X. no change in oxidation state, d electron count or total electron count
B-hydride elimination
M-A-B-H becomes M-H + A=B
B-hydride elimination
M-A-B-H becomes M-H + A=B
CO insertion
M-X + CO becomes M-C(O)-X, CO into M-C bond is a key step
sigma-bond metathesis reactions
M-X + Y-Z = M-Y + X-Z, no change in oxidation state or total electron count
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