3 edition of Sodium hydride found in the catalog.
Bibliography: p. 160-179.
|Statement||[By] Jaromír Plešek [and] Stanislav Heřmánek. English translation [by Karel Mayer] edited by G. Jones.|
|Contributions||Heřmańek, Stanislav, 1929-|
|The Physical Object|
|Number of Pages||185|
Structure, properties, spectra, suppliers and links for: Sodium hydride. Sodium Hydride Market Trend. Dry powder of about 8 to mesh in size (sodium hydride dry, 95%) and moist, paste-like material (sodium hydride 60% dispersion in mineral oil) are the commercially available forms of sodium hydride. Sodium hydride is flammable in air; therefore, it is dispersed in mineral oil to lower its high reactivity with air /5(17).
Sodium hydride Sodium hydride’s pka is about The pKa of the conjugate acid of sodium hydride (NaH) is ab the pKa of sodium hydroxide (NaOH) is ab and the pKa of the conjugate acid o sodium bicarbonate (NaHCO_3) is about Molec. Sodium and lithium hydride react with beryllium dialkyls in boiling ether forming crystalline salts MR 2 BeH (M = Li, R = Et; M = Na, R = Me, Et, Pr n, Pr i, Bu i ).The salt LiBu 2 i BeH is readily prepared by metathesis from the sodium salt and lithium bromide in ether. In some cases crystalline ether complexes have been isolated, e.g. NaEt 2 BeH(OR 2) (R = Me, Et), but.
Sodium Borohydride Lithium Aluminum hydride NaBH 4 LiBH 4 Hydride Ion When an aldehyde or ketone is reacted with NaBH4 or LiAlH4, followed by an acidic-water workup, an alcohol is the product. The carbonyl bond is reduced by the formal addition of H2 across the C=O π-bond (Figure 1). Note the hydrogen atom from the reducing agent (red) isFile Size: KB. It hydrolyses, somewhat violently, to produce sodium hydroxide and hydrogen gas (it also ignites on contact with air). The reaction is exothermic and can lead to the hydrogen gas igniting. As such, suitable precautions must be taken when handling.
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Sodium Hydride: Its Use in the Laboratory and in Technology [Jaromir Plesek, Stanislav Hermanek] on *FREE* shipping on qualifying offers. Sodium Hydride: Its Use in. Sodium hydride: its use in the laboratory and in t on *FREE* shipping on qualifying offers.
Sodium hydride: its use in the laboratory and in tManufacturer: CRC Press. Sodium hydride dust is a severe irritant and all operations should be done in a fume hood, under a dry atmosphere. Sodium hydride is stable in dry air at temperatures of up to Sodium hydride book before ignition occurs; in moist air, however, the hydride rapidly decomposes, and if the material is a very fine powder, spontaneous ignition can occur as a result of the heat evolved from the hydrolysis reaction.
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What is ProductSodium Hydride, soluble in. Per the Merck Index, 13th Edition, it reacts explosively with water, violently with lower alcohols, ignites spontaneously on standing in moist air.
Soluble in molten Sodium Hydroxide, insoluble in liquid Ammonia. Sodium hydride (NaH) is a strong base commonly used in organic chemistry to deprotonate alcohols, amine, amides, and other sufficiently acidic protons. Pure sodium hydride is prone to spontaneous ignition in moist air.
For this reason, the most common form of sodium hydride used in labs is 60% sodium hydride dispersed on mineral oil.
In the fume hood, mix the hydride with a mixture by weight of sodium carbonate or calcium carbonate, clay cat litter (bentonite), and sand. Slowly and cautiously add butanol (about 38 mL/g of hydride) until the reaction ceases.
Then add water very carefully until all of the hydride is destroyed. Let stand until solids settle. Additional Physical Format: Online version: Plešek, Jaromír, Sodium hydride.
London: Iliffe, (OCoLC) Document Type: Book: All Authors. Sodium aluminium hydride or sodium alanate is an inorganic compound with the chemical formula NaAlH is a white pyrophoric solid that dissolves in tetrahydrofuran (THF), but not in diethyl ether or hydrocarbons.
It has been evaluated as an agent for the reversible storage of hydrogen and it is used as a reagent for the chemical synthesis of organic lity: soluble in THF (16 g/ mL at room. Sodium borohydride, also known as sodium tetrahydridoborate and sodium tetrahydroborate, is an inorganic compound with the formula Na BH white solid, usually encountered as a powder, is a reducing agent that finds application in chemistry, both in the laboratory and on an industrial scale.
It has been tested as pretreatment for pulping of wood, but is too costly to be Number: Search results for sodium hydride at Sigma-Aldrich. Compare Products: Select up to 4 products. *Please select more than one item to compare.
The oil-dispersed sodium hydride is the safer and easier to handle, as the high reactivity of the hydride is protected by the oil. The principal use of sodium hydride is to carry out condensation and alkylation reactions which proceed through the formation of a carbanion (base-catalyzed). Additional Physical Format: Online version: Plešek, Jaromír, Sodium hydride.
Prague, Academia, (OCoLC) Document Type: Book: All Authors. An analysis of the gaseous byproducts from the DMF/NaH decomposition showed hydrogen, carbon monoxide, methane, and even ethylene/acetylene, which argues for a radical chain mechanism, at least in part.
In all cases, the more sodium hydride in the reaction, the lower the temperature where decomposition sets in. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.
IUPAC Standard InChIKey: MPMYQQHEHYDOCL-UHFFFAOYSA-N CAS Registry Number: Chemical structure: This structure is also available as a 2d Mol file; Permanent link for this species.
Use this link for bookmarking this species for future reference. Sodium hydride is a highly effective initiator and when added to a slow tertiary amine-initiated polymerization causes acceleration. 84 Unfortunately the high efficiency of sodium hydride may be interpreted in terms of a higher concentration of NCA anions or in terms of a stabilization of carbamate ions.
Sodium hydride is thus a rather. One attractive feature of alanates is that lithium and sodium salts are readily available commercially. Magnesium alanate can be readily prepared with sodium alanate and magnesium hydride via a metathesis reaction.
The mixed metal alanate, Na 2 LiAlH 6, is prepared through ball milling of sodium hydride, lithium hydride, and sodium alanate. hydride in this book. If we need basic hydride, we'll use sodium hydride, NaH.
Limitations SN2 at Me, 1o and 2o RX X Al H Li H H H lithium aluminium hydride (LAH) Limitations SN2 at Me, 1o and 2o RX Na B H H H X H Possible additional steps 1.
see 1o RX reactions, We use NaBH4 as nucleophilic hydride in this book. If we need basic hydride, we'll. Sodium hydride (NaH) has been commonly used as a Brønsted base in chemical syntheses, while it has rarely been employed to add hydride (H −) to unsaturated previously developed a procedure to activate NaH through the addition of a soluble iodide source and found that the new NaH–NaI composite can effect even stereoselective nucleophilic hydride reductions of nitriles Cited by:.
Hydrides such as sodium borohydride, lithium aluminium hydride, diisobutylaluminium hydride (DIBAL) and super hydride, are commonly used as reducing agents in chemical hydride adds to an electrophilic center, typically unsaturated carbon.
Hydrides such as sodium hydride and potassium hydride are used as strong bases in organic hydride reacts with the weak Bronsted.It can be noted that sodium borohydride is also known as sodium tetrahydroborate and sodium tetrahydridoborate. Preparation.
Sodium borohydride can be prepared on an industrial scale by treating trimethyl borate with sodium hydride at a temperature range of o C. The balanced chemical equation for this reaction is given by.The first example of an oxyanion-accelerated vinylcyclobutane rearrangement was reported by Wilson and Mao in 63 Exposure of exo-bicycloheptenol () to excess potassium hydride in THF at room temperature for 3 h afforded a mixture () of exo-and endo-norbornenol in addition to unrearranged starting material (Scheme 16).Although the endo-bicycloheptenol () was stable.