0000008064 00000 n The compound was discovered in the 1940s by H. I. Schlesinger, who led a team seeking volatile uranium compounds. It is used to make other chemicals, treat waste water, and for many other uses. German patent DE 1088930 19600915 (ChemAbs: 55:120851). Purification: crystallize from diglyme 3 or isopropylamine. Nikola Stiasni. 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: Millions of kilograms are produced annually, far exceeding the production levels of any other hydride reducing agent. Sodium borohydride burns in air [Lab. [7][8] Results of this wartime research were declassified and published in 1953. 0000006682 00000 n INGESTION: do NOT induce vomiting; give dilute vinegar, lemon juice, milk, or olive oil; call a doctor. It also reacts with these protic solvents to produce H2; however, these reactions are fairly slow. Addition of cerium chloride as an additive greatly improves the selectivity for 1,2-reduction of unsaturated ketones (Luche reduction). Except where otherwise noted, data are given for materials in their, CS1 maint: multiple names: authors list (, Rittmeyer, Peter and Wietelmann, Ulrich (2002) "Hydrides" in, Hermann I Schlesinger and Herbert C Brown (1945) ". The stable phase at room temperature and pressure is α-NaBH4, which is cubic and adopts an NaCl-type structure, in the Fm3m space group. Search for more papers by this author. Contact with water liberates highly flammable gas Safety data sheet: Sigma Aldrich: GHS pictograms: GHS Signal word: Danger: GHS hazard statements . 16940-66-2, EC Number 241-004-4. The same reaction can also occur intramolecularly: an α-ketoester converts into a diol, since the alcohol produced attacks the borohydride to produce an ester of the borohydride, which then reduces the neighboring ester. Reaction of water with the borohydride liberates flammable hydrogen gas. Handling, Storage, and Precautions: harmful if inhaled or absorbed through skin. It is used to make other chemicals, treat waste water, and for many other uses. At a pressure of 6.3 GPa, the structure changes to the tetragonal β-NaBH4 (space group P421c) and at 8.9 GPa, the orthorhombic γ-NaBH4 (space group Pnma) becomes the most stable.[11][12][13]. 0000003946 00000 n Such borohydride complexes are often prepared by the action of NaBH4 (or the LiBH4) on the corresponding metal halide. Complete decomposition of a methanol solution requires nearly 90 min at 20 °C. 0000002664 00000 n Variations in the counterion also affect the reactivity of the borohydride. 0000012174 00000 n It is decomposed by water to form sodium hydroxide, a corrosive material, and hydrogen, a flammable gas. Various steroids and vitamin A are prepared using sodium borohydride in at least one step. 1967]. - Find MSDS or SDS, a COA, data sheets and more information. [4] Sodium borohydride can also be produced by the action of NaH on powdered borosilicate glass. Data 1966]. 1:1 ratio at >100 °C with or without H pressure". Calcium oxide or sodium hydroxide react with phosphorus pentaoxide extremely violently when initiated by local heating [Mellor 8 Supp.3:406 (1971]. Sodium borohydride has been considered as a solid state hydrogen storage candidate. H228, H300, H310, H330, H314, H410: GHS precautionary statements. From the abstract: "Alkali metal borosilicates are treated with alkali metal hydrides in approx. There is currently an effort to modify the Bayer Process by employing the less expensive reducing metal magnesium (Mg) in place of sodium. The material itself is easily ignited and burns vigorously once ignited. Sodium borohydride is a source of basic borate salts which can be corrosive, and hydrogen or diborane, which are both flammable. Gov. α,β-Unsaturated esters also undergo 1,4-reduction in the presence of NaBH4. The heat of this reaction may be sufficient to ignite the hydrogen. It will also react with STRONG ACIDS (such as HYDROCHLORIC, SULFURIC and NITRIC) to produce poisonous Diborane gas. 0000006006 00000 n 0000004590 00000 n Supplement to. Università, di Genova, Italy. SODIUM BOROHYDRIDE is a powerful reducing agent. It is decomposed by water to form sodium hydroxide, a corrosive material, and hydrogen, a flammable gas. Chemist 1965]. The solid is known to exist as three polymorphs: α, β and γ. [23][24] Oxidation with iodine in tetrahydrofuran gives the borane–tetrahydrofuran complex, which can reduce carboxylic acids. Explosions have occurred in the past. In the presence of metal catalysts, sodium borohydride releases hydrogen. (USCG, 1999). Natriumborhydrid Sodium borohydride for analysis. It is decomposed by water to form sodium hydroxide, a corrosive material, and hydrogen, a flammable gas. 0000001198 00000 n Sodium borohydride is a white to grayish crystalline powder. 4. Schubert, F.; Lang, K.; Burger, A. NaBH4 reduces many organic carbonyls, depending on the precise conditions. %PDF-1.5 %���� It is decomposed by water to form sodium hydroxide, a corrosive material, and hydrogen, a flammable gas. 0000003148 00000 n Sodium borohydride: … Sodium borohydride is a source of basic borate salts which can be corrosive, and hydrogen or diborane, which are both flammable. This is an outdated version. [14], Different from it, the Bayer process is based on the reaction among borax (Na2B4O7), Na, H2, and silicon oxide (SiO2) at 700 °C producing sodium borohydride and sodium silicate. The material itself is easily ignited and burns vigorously once ignited. Università, di Genova, Italy. Threshold limit value (TLV) 5 mg/m3 (TWA) Related compounds Other anions. (1960) "Alkali metal borohydrides" (Bayer). Hydrolysis generates enough heat to ignite adjacent combustible material [Haz. Renata Riva. The heat of this reaction may be sufficient to ignite the hydrogen. The material itself is easily ignited and burns vigorously once ignited. 29 0 obj<> endobj There is a newer version of this article Luca Banfi. Lower Explosive Limit (LEL): data unavailable, Upper Explosive Limit (UEL): data unavailable, Autoignition Temperature: data unavailable, Vapor Density (Relative to Air): data unavailable, Metal Hydrides, Metal Alkyls, Metal Aryls, and Silanes. Sodium borohydride is a white to grayish crystalline powder. Materials & Energy Research Institute Tokyo, Ltd. Chemo- and stereoselectivity using Borohydride reagents, https://en.wikipedia.org/w/index.php?title=Sodium_borohydride&oldid=982636322, Chemical articles with multiple compound IDs, Multiple chemicals in an infobox that need indexing, Chemical articles with multiple CAS registry numbers, Chemical articles with multiple PubChem CIDs, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, This page was last edited on 9 October 2020, at 11:19.