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Lithium trialkylborohydrides reduce cyclic anhydrides to the corresponding lactones in good to excellent isolated yields.With unsymmetrical anhydrides, increasing the steric requirements of the trialkylborohydride dramatically enhances the regioselectivity of the reduction of the less hindered carbonyl group of the anhydride.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem