What is Sodium Borohydride?
Sodium borohydride is white to light gray crystalline powder. Decomposes with water to generate sodium hydroxide, corrosive substances and hydrogen s gas. Sodium borohydride, also known as sodium tetrahydroborate and sodium tetrahydroborate, is an inorganic compound with the chemical formula Na BH 4 . This white solid, usually in powder form, is a reducing agent with applications in laboratory and industrial-scale chemistry. It has been tested as a pretreatment for wood pulping, but the cost is too high to be commercialized. The compound is soluble in alcohols, some ethers and water, but hydrolyzes slowly.
Sodium Borohydride Description
Sodium borohydride is an inorganic compound, white to off-white fine crystalline powder or block. Rapid reaction with methanol at room temperature produces hydrogen gas. It is hygroscopic and deliquescent after absorbing water. Boiling point: 500°C (vacuum); Melting point: 400°C; Soluble in water, lower alcohols, ammonia water, insoluble in ether, benzene, hydrocarbons; Relative density (water=1): 1.07; Sodium borohydride is usually used as an inorganic Reducing agents in synthesis and organic synthesis. Sodium borohydride has strong selective reductivity, and can selectively reduce carbonyl to hydroxyl without reacting with carbon-carbon double and triple bonds. A small amount of sodium borohydride can reduce nitriles to aldehydes, and excessive reductions to amines. Nanocrystalline superlattices in gold colloidal solutions were prepared by ligand-induced reduction of AuCI3 with sodium borohydride. The nucleophilic addition of hydride ions from sodium borohydride is an inexpensive alternative to the Baylis-Hillman reaction to form [E]-a-methylcinnamic acid.
Sodium Borohydride Package
1kg aluminum thin bag, or 25kg per carton or cardboard drum
NaBH4 is less reactive than LiAIH4, but otherwise similar. It is only sufficient to reduce aldehydes, ketones and acid chlorides to alcohols: esters, amides, acids and nitriles are largely unaffected. It also acts as a nucleophile for halides and epoxides.
Melting point: >300 °C (dec.) (it)
Boiling point: 500°C
Density: 1.035 g/mL at 25 °C
Vapor pressure: <1 hPa (25 °C)
Storage temperature: Store at RT.
Specific gravity: 1.4
PH: 11 (10g/l, H2O, 20°C)
Explosive limit: 3.02%(V)
Water solubility: 550 g/L (25 °C)
Stable: : Stable, but reactive with water (reaction may be violent). Incompatible with water, oxidizing agents, carbon dioxide, hydrogen halides, acids, metal salts such as palladium and ruthenium, and glass. Flammable solid. Sensitive to air.
CAS Database Reference: 16940-66-2 (CAS Database Reference)
NIST Chemical Reference: Sodium Tetrahydroborate (16940-66-2)
EPA Substance Registration System: Sodium Borohydride (16940-66-2)
What is sodium borohydride used for?
Sodium borohydride is a white, odorless powder or granules. Used in bleached wood pulp, used as a foaming agent for plastics, and as a reducing agent for aldehydes and ketones.
How is Sodium Borohydride Made?
In the Brown-Schlesinger process, sodium borohydride is industrially composed of sodium hydride (generated from the reaction of Na and H2) and trimethyl borate at 250-270. Preparation under C: B(OC H3)3 + 4 Na H→NaBH4 + 3 NaOCH. Millions of kilograms are produced every year, far exceeding the production level of any other hydride reducing agent.
What are the properties of sodium borohydride?
Sodium borohydride is white to light gray crystalline powder. Decomposes with water to generate corrosive substance sodium hydroxide and flammable gas hydrogen. The reaction may be hot enough to ignite the hydrogen. The material itself is easily ignited – – – burns violently once ignited.
What do you do with sodium borohydride?
Safety goggles and a flame retardant lab coat must be worn when handling sodium borohydride, J nitrile, or chlorine J rubber gloves. Sodium borohydride is preferably handled in a glove box or under an inert atmosphere. It can also be handled in a clean, dry space inside a fume hood.
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