Sodium borohydride is the borohydride that is produced on the largest scale industrially, estimated at 5000 tons/year in 2002. Selected properties of various borohydride salts The countercation also influences the reducing power of the reagent. In contrast, cyanoborohydride is a weaker reductant owing to the electron-withdrawing cyano substituent. Electron-releasing ethyl groups as in triethylborohydride render the B−H center highly nucleophilic. The reactivity of the B−H bonds depends on the other ligands. In the borohydride anion and most of its modifications, boron has a tetrahedral structure. They synthesized lithium borohydride Li from diborane B 2H 6: 2 MH + B 2H 6 → 2 M, where M = Li, Na, K, Rb, Cs, etc.Ĭurrent methods involve reduction of trimethyl borate with sodium hydride. Alkali metal borohydrides were first described in 1940 by Hermann Irving Schlesinger and Herbert C.
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