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Base-catalyzed hydrolysis of inert octahedral ammine complexes of Co(III) displays a characteristic “conjugate-base” (SN1CB) pathway. A representative example is the conversion of \[Co(NH3)5Cl]2+ to \[Co(NH3)5OH]2+ in aqueous base. Hydroxide first deprotonates a coordinated ammine to give the conjugate-base amido complex, \[Co(NH3)4(NH2)Cl]+, in a rapid pre-equilibrium. The strong σ-donor NH2− exerts a powerful trans-labilizing influence, weakening the Co–Cl bond trans to it. The rate-determining step ___ ______ __________ ______ __________ ____.
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