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・ Lithium (Sirius)
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Lithium borohydride
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Lithium borohydride : ウィキペディア英語版
Lithium borohydride

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Lithium borohydride (LiBH4) is a tetrahydroborate and known in organic synthesis as a reducing agent for esters. Although less common than the related sodium borohydride, the lithium salt offers some advantages, being a stronger reducing agent and highly soluble in ethers, whilst remaining safer to handle than lithium aluminium hydride.
==Preparation==
Lithium borohydride may be prepared by the metathesis reaction, which occurs upon ball-milling the more commonly available sodium borohydride, and lithium bromide:〔Peter Rittmeyer, Ulrich Wietelmann “Hydrides” in Ullmann's Encyclopedia of Industrial Chemistry, 2002, Wiley-VCH, Weinheim. 〕
: NaBH4 + LiBr → NaBr + LiBH4
Alternatively the chemical may be synthesized from Boron trifluoride and lithium hydride in diethyl ether:
:BF3 + 4 LiH → LiBH4 + 3 LiF

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