Abstract
An effective and mild synthetic method for secondary phosphine-boranes from secondary phosphine oxides was developed. The slow addition of borane-tetrahydrofuran to a solution of secondary phosphine oxides at ambient temperature gave secondary phosphine-boranes with high yield. The use of air-sensitive secondary phosphines, which are common substrates for secondary phosphine-borane syntheses, is avoided in this mild process. Moreover, generation of by-products, such as secondary hydroxy-phosphine-boranes, is also minimized.
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