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Synthesis and Handling of Sodium Borohydride

        Sodium borohydride is prepared by two routes of industrial significance. In one method, based on the original work of Schlesinger, sodium hydride is treated with trimethyl borate at 250-270 °C:

B(OCH3)3 + 4 NaH → NaBH4 + 3 NaOCH3
        Alternatively, sodium borohydride is also produced by the action of NaH on powdered borosilicate glass. Millions of kilograms are produced annually, far exceeding the production levels of any other hydride reducing agent.
        NaBH4 can be recrystallized by dissolving in warm (50 °C) diglyme followed by cooling the solution.