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Hi Im trying to figure out which of the following is the stronger reducing agent.

(i-Bu)2AlH vs Lithium aluminum tri(t-butoxy)hydride

From my understanding, the Lithium aluminum tri(t-butoxy)hydride should be the stronger reducing reagent since it has a negative charge on the aluminum which would help push electron density onto the hydrogen. But on the lecture slides it says that Lithium aluminum tri(t-butoxy)hydride is a milder reducing agent. Can someone provide reasoning why that is the case. Thanks

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