METHOD FOR PREPARING BORATE

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Disclosed is a method for preparing a borate, comprising the following steps : stirring and mixing evenly a catalyst, a borane, and an aldehyde and reacting to produce a borate; the catalyst being a tris(methylphenyl) rare earth metal complex; and the molecular formula of the tris(methylphenyl) rare earth metal complex can be expressed as : Ln(MeCp)3, Ln being a rare earth metal selected from the lanthanides. The preparation method has extremely high catalytic activity and, at the same time, mild reaction conditions, easy product post-processing, a short reaction time, low catalyst usage, and a great range of substrate applicability and allows industrialized production.