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Topic: Lithium aluminum hydride


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  Preparation of Lithium Aluminum Hydride
Lithium aluminum hydride, on the other hand, may be freed from the solvent completely by evaporation of the latter under suitable conditions.
The chemical properties of aluminum hydride are similar to those of lithium aluminum hydride, although the instability of the ether solution of the former limits its usefulness.
The solubility of lithium aluminum hydride in grams per 100g of various ethers at 25°C are as follows: diethyl ether 25-30, tetrahydrofuran 13, dibutyl ether 2 and dioxane 0.1.
www.erowid.org /archive/rhodium/chemistry/lah.synthesis.html   (1594 words)

  
  lithium. The Columbia Encyclopedia, Sixth Edition. 2001-05
Lithium hydroxide is used to increase the capacity of alkaline storage cells.
Lithium compounds are used in the nuclear energy industry, in the preparation of plastics and synthetic rubber, and in the synthesis of vitamin A. Lithium is added in small amounts to magnesium, aluminum, or lead-base alloys; it is also used as a degasifier in iron, steel, and copper refining.
Lithium is widely distributed in nature; it is found in the soil, in plants, in animals, and in the human body.
www.bartleby.com /65/li/lithium.html   (445 words)

  
  HHMI Lab Safety: LCSS: LITHIUM ALUMINUM HYDRIDE   (Site not responding. Last check: )
Lithium aluminum hydride is highly corrosive to the skin, eyes, and mucous membranes.
Lithium aluminum hydride is a highly flammable solid and may ignite in moist or heated air.
Lithium aluminum hydride should be handled in the laboratory using the "basic prudent practices" described in Chapter 5.C, supplemented by the additional precautions for work with flammable (Chapter 5.F) and reactive (Chapter 5.G) substances.
www.hhmi.org /about/labsafe/lcss/lcss56.html   (747 words)

  
 AllRefer.com - lithium, Compound & Element (Compounds And Elements) - Encyclopedia
Lithium hydroxide is used to increase the capacity of alkaline storage cells.
Lithium compounds are used in the nuclear energy industry, in the preparation of plastics and synthetic rubber, and in the synthesis of vitamin A. Lithium is added in small amounts to magnesium, aluminum, or lead-base alloys; it is also used as a degasifier in iron, steel, and copper refining.
Lithium is widely distributed in nature; it is found in the soil, in plants, in animals, and in the human body.
reference.allrefer.com /encyclopedia/L/lithium.html   (498 words)

  
 Preparation of Lithium Aluminum Hydride
Lithium aluminum hydride, on the other hand, may be freed from the solvent completely by evaporation of the latter under suitable conditions.
In a typical preparation, an excess of lithium hydride (23.5g or 2.96 moles) was added to a solution of 3.05g (0.08 mole) of lithium aluminum hydride in 30 ml of diethyl ether, and the mixture was stirred for a short time.
A small quantity of aluminum chloride (2.7g) was mixed with a 6-fold excess of lithium hydride (4g) under dry nitrogen in a small round bottomed flask, which was then attached through a standard ground glass joint to a vacuum system, and evacuated.
www.designer-drugs.com /pte/12.162.180.114/dcd/chemistry/lah.synthesis.html   (1632 words)

  
 Carbon-Carbon Bonds from Esters
When the "hydride ion" (H:) from lithium aluminum hydride replaces the OR' group of the ester, an aldehyde is formed.
We've already seen that and aldehyde is reduced by lithium aluminum hydride, so it comes as no surprise that the aldehyde is immediately reduced to a primary alcohol.
The result is that esters are reduced by lithium aluminum hydride to primary alcohols in which the ester carbon has become the alcohol carbon.
chemistry2.csudh.edu /rpendarvis/carb-enolate.html   (986 words)

  
 lithium - Encyclopedia.com   (Site not responding. Last check: )
Lithium decline Reflects Economic, not Clinical Trends: Since 1965, 24 studies have reported a drop in bipolar recurrence with lithium.
Lithium treatment of acute mania in adolescents: a placebo-controlled discontinuation study.
The mechanism of lithium and beta-blocking agents in inducing and exacerbating psoriasis.
www.encyclopedia.com /doc/1E1-lithium.html   (897 words)

  
 Process for the preparation of lithium aluminum hydride in etheral solvents - Patent 5730952
A process for the preparation of lithium aluminum hydride in an ethereal solvent via the metathesis of sodium aluminum hydride and lithium chloride in a one direct step reaction comprising heating together sodium aluminum hydride and lithium chloride in an ethereal solvent at a temperature of 25.degree.
The second method typically involves a one step process in which sodium aluminum hydride and lithium chloride are reacted together in one reactor along with toluene as a co-solvent and a few mole percent of lithium aluminum hydride to catalyze the reaction.
Solid sodium aluminum hydride is added to lithium chloride which is generally present in a slight excess, for example, 1.1 equivalents, based on the sodium aluminum hydride, in an ethereal solvent at room temperature.
freepatentsonline.com /5730952.html   (1234 words)

  
 reduction
Lithium aluminum hydride is highly reactive and can reduce carboxylic acids, esters, and amides as well as simple aldehydes and ketones.
Lithium aluminum hydride is much more reactive and reacts explosively with water to generate hydrogen gas which may ignite from the heat of reaction.
Lithium aluminum hydride reacts with moist air and must be handled carefully and the excess reagent must be disposed of carefully.
people.uis.edu /gtram1/organic/carbonyl/reduction.htm   (379 words)

  
 LITHIUM ALUMINUM HYDRIDE (LITHIUM TETRAHYDRIDOALUMINATE)
Lithium aluminum hydride is sold in commerce as a solution in THF to escape the reaction of aluminum with moisture and to allow handling in air.
Lithium hydride is the main raw material to produce LAH by reaction with aluminium chloride.
Lithium Hydride: flammable, white, translucent solids; decomposes at 850 C; reacts violently with water to yield hydrogen and lithium hydroxide; used as a hydrogen source or reducing agent to prepare other hydrides amides and 2H isotopic compound, as a shielding material for thermal neutrons.
www.chemicalland21.com /arokorhi/industrialchem/inorganic/LITHIUM%20ALUMINUM%20HYDRIDE.htm   (1001 words)

  
 Conversion of isobutene to aromatics - Patent 4384154
The aluminum hydride suitable for use in preparing the catalysts used in this invention is prepared commercially by reacting at room temperature lithium aluminum hydride and aluminum chloride in diethyl ether (Et.sub.2 O).
To prepare the compositions used in the instant invention, porous silica suitably dried of adsorbed water is contacted with a solution of aluminum hydride in appropriate proportions as to provide the desired amount of aluminum hydride per unit weight of silica.
While the exact physical structure of the instant composition is not known, it is speculated that the decomposition of the aluminum hydride on the silica surface produces localized Lewis acid sites having an atomic ratio of oxygen to metal ratios lower than the normal oxygen to silica ratio.
www.freepatentsonline.com /4384154.html   (1944 words)

  
 Lithium aluminium hydride - Definition, explanation
LAH is usually produced by the reaction between lithium hydride (LiH) and aluminium chloride (AlCl
Lithium aluminium hydride is widely used in organic chemistry as a very powerful reducing agent.
Lithium aluminium hydride is not able to reduce simple alkenes or benzene rings, and alkynes are only reduced if an alcohol group is nearby.
www.calsky.com /lexikon/en/txt/l/li/lithium_aluminium_hydride.php   (789 words)

  
 Untitled Document
Lithium, Na, is an Alkali Metal element, found in Group Ia of the periodic table.
Lithium is a rare metallic element, but it is widely distributed.
Lithium is detected in its compounds by the characteristic red coloration, which it imparts to flames when burned, and by spectroscopic methods.
www.geocities.com /afixcore/lithium.htm   (264 words)

  
 NIRVANA LITHIUM - lithium aluminum hydride, energizer lithium battery, aaa lithium battery, 123 lithium battery   (Site not responding. Last check: )
Lithium is used to treat manic episodes of manic-depressive illness.
Lithium is in the FDA pregnancy category D. Some elderly patients with lower renal clearances for lithium may also experience different degrees of lithium toxicity, requiring reduction or temporary withdrawal of medication.
Lithium should be used during pregnancy only in severe disease for which safer drugs cannot be used or are ineffective.
kmainhoff.h.fc2.com /lithium/nirvana_lithium.html   (949 words)

  
 Chemical Information
Lithium aluminum hydride (LAH) is an odorless solid that reacts violently with water, acids and oxygenated compounds.
When large quantities of powdered LAH will be used, work under an inert gas, such as nitrogen or argon, in a fume hood or glove box.
LAH is incompatible with alcohols, transition metal salts, oxidizing agents, and a wide variety of other materials.
web.princeton.edu /sites/ehs/labsafetymanual/cheminfo/lah.htm   (276 words)

  
 LITHIUM - lithium aspartate, lithium carbonate side effects : Indymedia Colombia
In addition to the charging lithium ion battery ordinary effects of toxicity, abnormal walking or lithium lithium aluminum hydride movement patterns, or a risk of sudden coma are higher.
Lithium is a monovalent cation which belongs to the group of alkali metals together with sodium, potassium and other elements with which it shares some of its properties.
Kidney tests are performed as lithium is eliminated from the body in urine and if this excretory mechanism is not adequate it may not be possible to prescribe lithium.
colombia.indymedia.org /print.php?id=56434   (838 words)

  
 Chemical Information
Lithium aluminum hydride (LAH) is an odorless solid that reacts violently with water, acids and oxygenated compounds.
When large quantities of powdered LAH will be used, work under an inert gas, such as nitrogen or argon, in a fume hood or glove box.
LAH is incompatible with alcohols, transition metal salts, oxidizing agents, and a wide variety of other materials.
webware.princeton.edu /sites/ehs/labsafetymanual/cheminfo/lah.htm   (276 words)

  
 Columbia Encyclopedia- lithium - AOL Research & Learn
Lithium forms many inorganic compounds, among them a hydride (LiH), a nitride (Li3N), an oxide (lithia, Li2O), a hydroxide (LiOH), a carbide (Li2C2), a carbonate (Li2CO3), and a phosphate (Li3PO4).
Lithium aluminum hydride (LiAlH4) is an important reagent in organic chemistry.
Lithium in the salt form has recently come into use as a medical treatment for bipolar disorder.
reference.aol.com /columbia/_a/lithium/20051206201509990019   (418 words)

  
 Lithium Alloys
The new aluminum alloy, under patent application, has a tensile strength of 780MPa, 10% higher than the 710 MPa of Weldalite(R), an aluminum-lithium alloy developed by Lockheed Martin Corporation and used in the External Fuel Tank of the Space Shuttle.
As the sample pieces of the new aluminum alloy are made by the same spray-forming equipment used to produce target material, Kobe Steel will be able to achieve volume production of the new alloy in a relatively short time.
The format is a series of presentations in the key areas of lithium batteries, with contributed papers given as posters.
articles.industry-metal.com /category/lithium-alloys   (3066 words)

  
 Laureates of Tomorrow Nobel Essay Contest
Normally, the monomers underwent polymerization so rapidly it was difficult to study, yet his use of lithium alkyls and dilation of butadiene with ether allowed Ziegler to isolate small chains of the polymer.
The reaction between aluminum hydride and three molecules of olefins was the foundation for the direct synthesis of these aluminum trialkyls.
Aluminum, the most popular of the organometallic compounds to be used, was reacted with other heavy metals such as titanium, zirconium, chromium, and cobalt.
www.nyas.org /programs/nobel/essay4.html   (1967 words)

  
 Carboxyl Derivative Reactivity
Because the outcome of LAH reduction is so different for esters and amides, we must examine plausible reaction mechanisms for these reactions to discover a reason for this divergent behavior.
In contrast to the usefulness of lithium aluminum hydride in reducing various carboxylic acid derivatives, sodium borohydride is seldom chosen for this purpose.
Since relatively few methods exist for the reduction of carboxylic acid derivatives to aldehydes, it would be useful to modify the reactivity and solubility of LAH to permit partial reductions of this kind to be achieved.
www.cem.msu.edu /~reusch/VirtualText/crbacid2.htm   (3950 words)

  
 FMC Lithium @ ChemBuyersGuide.com, Inc.
The future is eminently clear for a company intent on global leadership in lithium and associated technologies.
We are known as the world’s lithium experts; however, our distinction comes not only from our technical prowess, but also from the level of commitment that our people make each and every day to every single customer in meeting their unique requirements.
FMC Lithium is committed to providing complete solutions to eight major identifiable markets including: air treatment, construction, energy, fine chemicals, glass and ceramics, greases and lubricants, polymers, pool water treatment and within unique, high value specialty applications.
www.chembuyersguide.com /partners/fmclithium.html   (301 words)

  
 FMC Lithium, manufacturer of lithium chemistry products.
Lithium Diethylamide, Lithium Diisopropylamide, Lithium Dimethylamide, Lithium Fluoride, Lithium Hexamethyldisilazide,
Lithium Hydroxide, Lithium Hypochlorite, Lithium Metaborate, Lithium Metal, Lithium Methoxide, Lithium Molybdate, Lithium Nitrate,
Lithium Orthophosphate, Lithium Phosphate, Lithium Sulfate, Lithium t-Butoxide, Lithium Tetraborate.
www.fmclithium.com   (67 words)

  
 lithium aluminum hydride msds
Lithium tri-tert-butoxyaluminum hydride reacts violently with water to form.
for the product.Lithium aluminum hydride reacts violently with...
lortab 10 mg - Lithium aluminum hydride: Corrosive.
www.masterspasoftexas.com /edit/html/p/lithium-aluminum-230498.html   (183 words)

  
 Method for reduction of substituted malonates to diols - Patent 6538163
Substituted malonates have been reduced to the corresponding diols with lithium aluminum hydride or with lithium borohydride, as described in U.S. Pat.
Sodium aluminum hydride typically is available commercially as a slurry in toluene at a lower cost than lithium aluminum hydride or lithium borohydride.
In one embodiment of the invention, sodium aluminum hydride ("SAH") is introduced in the form of a slurry comprising SAH and toluene.
www.freepatentsonline.com /6538163.html   (1473 words)

  
 INTRODUCTION   (Site not responding. Last check: )
Among the many types of reducing reagents, the most common are the metal hydrides: lithium aluminum hydride and sodium borohydride.
At room temperature the lithium aluminum hydride is a very powerful reducing agent, it is capable of reducing carboxylic acids, esters, nitriles, amides, aldehydes, and ketones while sodium borohydride at room temperature only reduces aldehydes and ketones to the corresponding alcohols.
Reduction reactions using lithium aluminum hydride and sodium borohydride proceed by the addition of a hydride ion to the organic substrate.
www.neiu.edu /~jhramire/Reducing/introduction.htm   (184 words)

  
 OxiationLevels
Reagents that act as hydride ion donors all share one structural feature: They all contain at least one hydrogen atom that is bonded to another atom which is less electronegative than hydrogen.
While lithium aluminum hydride's high reactivity may be useful, it can also be a disadvantage if you want to selectively reduce one heteronuclear multiple bond in a compound that contains several.
By using 1 equivalent of DIBAL at low temperatures it is possible to reduce the ester to the corresponding aldehyde without further reduction of the aldehyde to the primary alcohol.
www.usm.maine.edu /~newton/Chy251_253/Lectures/OxidtionReduction/OxiationReduction.html   (1722 words)

  
 SCHWARTZ'S REAGENT
This solution is prepared by adding lithium aluminum hydride to ethyl ether, stirring the suspension for 10 min, and allowing the undissolved material to settle to the bottom of the flask.
Methylene chloride is distilled from calcium hydride under argon at atmospheric pressure immediately before use.
It is important to keep the methylene chloride wash in contact with the Schwartz's Reagent for a maximum period of 10 min; use of a frit filter is essential.
www.orgsyn.org /orgsyn/orgsyn/prepContent.asp?rxntypeid=45&prep=CV9P0162   (824 words)

  
 Reduction of Phenolic Nitrostyrenes by Lithium Aluminum Hydride - [www.rhodium.ws]
Reduction of Phenolic Nitrostyrenes by Lithium Aluminum Hydride - [www.rhodium.ws]
The water layer was separated and its pH adjusted to 6 with solid lithium carbonate.
and the aluminum hydroxide which precipitated was filtered off with the aid of filter-cel; the clear, hot filtrate was mixed with a solution of 70g.
erowid.org /archive/rhodium/chemistry/lah.phenolic.nitrostyrenes.html   (724 words)

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