Sodium Borohydride CAS 16940-66-2

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Sodium Borohydride CAS 16940-66-2 BH4Na

Sodium Borohydride CAS 16940-66-2 BH4Na, hot in Canada/USA/Europe, stock available.

BH4Na Basic Parameter

Product Name: Sodium Borohydride
Synonyms: boron sodium hydride; sodium boranoate; NaBH4; Kodalk; Sodium tetrahydroborate; Sodium dioxoborate; sodium tetraborohydride; sodium tetrahydridoborate; Sodiooxyboron oxide; Sodium borohydride
CAS NO: 16940-66-2
Molecular Formula: H4BNa
Molecular Weight: 37.833
Boiling Point: 500ºC
Melting Point: 400ºC (dec.)
Flash Point: 69ºC
Density: 1.07
Water Solubility: 550 g/L (25 ºC)

CAS 16940-66-2 Picture

BH4Na, Sodium borohydride, BH4Na, cas 16940-66-2

What is Sodium borohydride

Sodium borohydride, also known as sodium tetrahydridoborate and sodium tetrahydroborate, is an inorganic compound with the formula NaBH4 (sometimes written as Na[BH4]). It is a white crystalline solid, usually encountered as an aqueous basic solution. Sodium borohydride is a reducing agent that finds application in papermaking and dye industries. It is also used as a reagent in organic synthesis.

The compound was discovered in the 1940s by H. I. Schlesinger, who led a team seeking volatile uranium compounds. Results of this wartime research were declassified and published in 1953.


NaBH4 is a salt, consisting of the tetrahedral [BH4] anion. The solid is known to exist as three polymorphs: αβ and γ. The stable phase at room temperature and pressure is αNaBH4, which is cubic and adopts an NaCl-type structure, in the Fm3m space group. At a pressure of 6.3 GPa, the structure changes to the tetragonal βNaBH4 (space group P421c) and at 8.9 GPa, the orthorhombic γNaBH4 (space group Pnma) becomes the most stable.

Synthesis and handling

For commercial NaBH4 production, the Brown-Schlesinger process and the Bayer process are the most popular methods. In the Brown-Schlesinger process sodium borohydride is industrially prepared from sodium hydride (produced by reacting Na and H2) and trimethyl borate at 250–270 °C:

B(OCH3)3 + 4 NaH → NaBH4 + 3 NaOCH3

Millions of kilograms are produced annually, far exceeding the production levels of any other hydride reducing agent. In the Bayer process, it is produced from inorganic borates, including borosilicate glass and borax (Na2B4O7):

Na2B4O7 + 16 Na + 8 H2 + 7 SiO2 → 4 NaBH4 + 7 Na2SiO3

Magnesium is a less expensive reductant, and could in principle be used instead:

8 MgH2 + Na2B4O7 + Na2CO3 → 4 NaBH4 + 8 MgO + CO2


2 MgH2 + NaBO2 → NaBH4 + 2 MgO

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