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An application of a bis(β-diimide) rare earth amide for catalyzing a hydroboration reaction between a ketone and a borane. The molecular formula of a catalyst is [2‑Me‑C6H4‑NC(Me)CHC(Me)N‑C6H4‑2‑Me]2LnN(SiMe3)2, wherein Ln represents a rare earth metal selected from either Nd or Pr. The catalyst can achieve an addition reaction between a borane and a ketone within a short period of time (8-10 minutes) under mild conditions (room temperature) and can provide an extremely high yield. The invention is the first embodiment using a rare earth compound for catalyzing a reaction.