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Lithium Aluminum Hydride

Product Name
Lithium Aluminum Hydride
CAS No.
16853-85-3
Chemical Name
Lithium Aluminum Hydride
Synonyms
LAH;LiAlH4;LITHIUM ALUMINIUM TETRAHYDRIDE;LITHIUM ALUMINIUM HYDRIDE;LITHIUM ALANATE;LITHIUM TETRAHYDROALUMINATE;lithium aluminum hydride solution;Lithium aluminohydride;LITHIUM TETRAHYDRIDOALUMINATE;Aluminate (1-), tetrahydro-, lithium
CBNumber
CB7318252
Molecular Formula
LiAlH4
Formula Weight
37.954298
MOL File
16853-85-3.mol
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Lithium Aluminum Hydride Property

Melting point:
125 °C (dec.)(lit.)
Boiling point:
0°C
Density 
0.97 g/mL at 20 °C
Flash point:
99 °F
storage temp. 
Store below +30°C.
solubility 
reacts with H2O, ethanol; seth, tetrahydrofuran
form 
tablets (~0.5 g each)
color 
White to light gray
Specific Gravity
0.917
Odor
Odorless solid
Water Solubility 
Reacts
Sensitive 
Air & Moisture Sensitive
Hydrolytic Sensitivity
8: reacts rapidly with moisture, water, protic solvents
Merck 
14,350
Exposure limits
TLV-TWA 2 mg(Al)/m3 (ACGIH).
Stability:
Stable. Reacts violently with water, liberating hydrogen. Incompatible with strong oxidizing agents, alcohols, acids.
CAS DataBase Reference
16853-85-3(CAS DataBase Reference)
NIST Chemistry Reference
Lithium tetrahydroaluminate(16853-85-3)
EPA Substance Registry System
Lithium aluminum hydride (16853-85-3)
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Safety

Hazard Codes 
F,C,Xi,Xn,F+,T
Risk Statements 
15-34-14/15-11-36/37-19-40-10-67-66-22-12-35-37-65-48/20-63-36/38-61-60
Safety Statements 
43-7/8-6A-45-43B-36/37/39-33-26-16-24/25-27-29-62-53
RIDADR 
UN 3399 4.3/PG 1
WGK Germany 
2
RTECS 
BD0100000
10-21
TSCA 
Yes
HS Code 
2850 00 20
HazardClass 
4.3
PackingGroup 
I
Hazardous Substances Data
16853-85-3(Hazardous Substances Data)
Toxicity
TLV-TWA (ACGIH) 2 mg (Al)/m3
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H260In contact with water releases flammable gases which may ignite spontaneously

H314Causes severe skin burns and eye damage

Precautionary statements

P223Keep away from any possible contact with water, because of violent reaction and possible flash fire.

P231+P232Handle under inert gas. Protect from moisture.

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
8.14763
Product name
Lithium aluminium hydride
Purity
(powder) for synthesis
Packaging
1kg
Price
$367
Updated
2024/03/01
Sigma-Aldrich
Product number
212776
Product name
Lithium aluminum hydride solution
Purity
1.0?M in THF
Packaging
18L
Price
$4260
Updated
2024/03/01
Sigma-Aldrich
Product number
199877
Product name
Lithium aluminum hydride
Purity
powder, reagent grade, 95%
Packaging
10g
Price
$102
Updated
2024/03/01
Sigma-Aldrich
Product number
199877
Product name
Lithium aluminum hydride
Purity
powder, reagent grade, 95%
Packaging
1kg
Price
$1080
Updated
2024/03/01
Sigma-Aldrich
Product number
8.1887A
Product name
Lithium aluminium hydride
Purity
(powder) for synthesis
Packaging
25g
Price
$86.4
Updated
2023/06/20
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Lithium Aluminum Hydride Chemical Properties,Usage,Production

Description

Lithium aluminum hydride (LiAlH4) is a promising compound for hydrogen storage, with a high gravimetric and volumetric hydrogen density and a low decomposition temperature. Similar to other metastable hydrides, LiAlH4 does not form by direct hydrogenation at reasonable hydrogen pressures; therefore, there is considerable interest in developing new routes to regenerate the material from the dehydrogenated products LiH and Al. It can also be used as a reducing agent in the preparation of reduced graphene oxide (rGO).

Chemical Properties

Lithium aluminum hydride is a white to gray powder. A combustible solid. monoclinic crystals; grey in the presence of aluminum impurity; stable below 120°C in dry air; turns grey on standing; hygroscopic; density 0.917 g/cm3; melts at 190°C (decomposes); reacts with water and alcohols; soluble in diethylether and tetrahydrofuran (about 30 and 13 g/100g, respectively at 25°C; also soluble in dimethylcellosolve; sparingly soluble in dibutylether; slightly soluble in dioxane (1g/L) and practically insoluble in hydrocarbons; can be solubilized in benzene by crown ether.

Physical properties

White crystalline powder when pure; monoclinic crystals; grey in the presence of aluminum impurity; stable below 120°C in dry air; turns grey on standing; hygroscopic; density 0.917 g/cm3; melts at 190°C (decomposes); reacts with water and alcohols; soluble in diethylether and tetrahydrofuran (about 30 and 13 g/100g, respectively at 25°C; also soluble in dimethylcellosolve; sparingly soluble in dibutylether; slightly soluble in dioxane (1g/L) and practically insoluble in hydrocarbons; can be solubilized in benzene by crown ether.

Uses

Lithium aluminum hydride is among the most important industrial reducingagents. It is used extensively in organic syntheses and also in catalytichydrogenation. Reactant or reagent for:
1. The preparation of thermoplastic polyester polyamides from oleic acid
2. Lithium-polymer batteries
3. Hydrodefluorination of gem-difluoromethylene derivatives
4. Asymmetric aldol reactions
5. Synthesis of Li-Al-N-H composites with hydrogen absorption / desorption properties
6. LAH is a powerful reducing agent for many different reduction reactions such as that of ketones to alcohols

Uses

It is used as a powerful reducing agent inorganic synthesis. Except for olefinic doublebonds, almost all organic functional groupsare reduced by lithium aluminum hydride(Sullivan and Wade 1980). It is used extensivelyin pharmaceutical synthesis and in catalytichydrogenation.

Preparation

Lithium aluminum hydride is prepared by reaction of lithium hydride with aluminum chloride in diethylether:
4LiH + AlCl3 →(C2H5)2O→LiAlH4+3LiCl

Application

Lithium aluminum hydride (LiAlH4) is an effective reducing agent that can be used in chemical synthesis to reduce esters, carboxylic acids, acyl chlorides, aldehydes, epoxides, and ketones into the corresponding alcohols. In addition, amide, nitro, nitrile, imine, oxime, and azide compounds are converted into amines.
LiAlH4 is a promising substance for hydrogen storage applications. Its properties include high gravimetric and volumetric hydrogen densities . It can also be used as a reducing agent in the preparation of reduced graphene oxide (rGO).

General Description

A white powder that turns gray on standing. If spread out over a large flat combustible surface, friction can cause ignition. Used to make other chemicals, as a polymerization catalyst, as a hydrogen source, and as a propellant.

Air & Water Reactions

Reacts with water vigorously attaining incandescence and ignition of evolved hydrogen [Kelen, Cahiers, 1977, (86), 100]. Reactions with water or moist air (or heated air) are violent and may be explosive [Schmidt, D.L., et al. Inorg. Synth. 1973. p. 14, 51].

Reactivity Profile

Lithium aluminium hydride is a powerful reducing agent. React violently on contact with many oxidizing agents. Ignites by friction, especially if powdered. Reacts vigorously with hydroxy compounds such as water, alcohols, carboxylic acids [Mellor 2 Supp. 2:142. 1961]. Caused a violent explosion when used to dry diethylene glycol dimethyl ether: Ignition may have been caused by heat from reaction with impurity water or perhaps decomposition of peroxides in the ether. About 75% of the ether had been removed when the explosion occurred [MCA Case History 1494. 1968]. Reduces carbon dioxide or sodium hydrogen carbonate to methane and ethane at elevated temperatures. These flammable or explosive gases can form when CO2 extinguishers are used to fight hydride fires. Forms explosive complexes with ether, dimethylamine and various tetrazoles. Tetrazoles include, 2-methyl, 2-ethyl, 5-ethyl, 2-methyl-5-vinyl, 5-amino-2-ethyl [US Pat. 3 396 170, 1968].

Hazard

Lithium aluminum hydride is a flammable substance. It ignites spontaneously on grinding and reacts violently with water and many organic substances. Diethyl ether, tetrahydrofuran or another suitable solvent should be used in its synthetic applications. Dry or powdered limestone is an appropriate fire extinguishing agent.

Health Hazard

Lithium aluminum hydride is highly corrosive to the skin, eyes, and mucous membranes. Contact with moisture forms lithium hydroxide, which can cause severe burns. Powdered LAH forms dusts that can pose an inhalation hazard. Ingestion of this substance may cause aching muscles, nausea, vomiting, dizziness, and unconsciousness and may be fatal. Ingestion can result in gas embolism due to the formation of hydrogen.
No chronic effects of lithium aluminum hydride have been identified

Flammability and Explosibility

Lithium aluminum hydride is a highly flammable solid and may ignite in moist or heated air. Exposure to water results in the release of hydrogen, which can be ignited by the heat from the exothermic reaction. Lithium aluminum hydride should not be used as a drying agent for solvents because fires can easily result (LAH decomposes at about 125° C, a temperature easily reached at a flask's surface in a heating mantle). The decomposition products of LAH can be quite explosive, and the products of its reaction with carbon dioxide have been reported to be explosive. Use dry chemical powder or sand to extinguish fires involving lithium aluminum hydride. Never use water or carbon dioxide extinguishers on an LAH fire.

Safety Profile

Stable in dry air at room temperature. It decomposes above 125' forming Al, H2, and lithium hydride. Very powerful reducer. Can ignite if pulverized even in a dry box. Reacts violently with air, acids, alcohols, benzoyl peroxide, boron trifluoride etherate, (2 chloromethyl furan + ethyl acetate), diethylene glycol dimethyl ether, diethyl ether, 1,2-dimethoxyethane, dimethyl ether, methyl ethyl ether, (nitriles + H2O), perfluorosuccinamide, (perfluorosuccinamide + H20), tetrahydrofuran, water. To fight fire, use dry chemical, includmg special formulations of dry chemicals as recommended by the supplier of the lithium aluminum hydride. Do not use water, fog, spray, or mist. Incompatible with bis (2-methoxyethyl)ether, CO2, BF3, diethyl etherate, dibenzoyl peroxide, 3,5 dbromocyclopentene, 172-dimethoxy ethane, ethyl acetate, fluoro amides, pyridine, tetrahydrofuran. Used as a reducing agent in the preparation of pharmaceuticals. See also ALUMINUM, LITHIUM COMPOUNDS, and HYDRIDES.

Potential Exposure

This material is used as a catalyst and as a specialty reducing agent in organic synthesis.

First aid

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medical attention. Give large quantities of water and inducevomiting. Do not make an unconscious person vomit.Medical observation is recommended for 24-48 h afterbreathing overexposure, as pulmonary edema may bedelayed. As first aid for pulmonary edema, a doctor orauthorized paramedic may consider administering a corticosteroid spray.

storage

LAH should be handled in areas free of ignition sources under an inert atmosphere. Safety glasses, impermeable gloves, and a fire-retardant laboratory coat are required. A dry powder fire extinguisher or pail of sand (and shovel) must be available in areas where LAH is to be handled or stored. Work with large quantities of powdered LAH should be conducted in a fume hood under an inert gas such as nitrogen or argon. Lithium aluminum hydride should be stored in tightly sealed containers in a cool, dry area separate from combustible materials. Dry LAH powder should never be exposed to water or moist air. Lithium aluminum hydride can be a finely powdered reagent that produces a reactive dust on handling. The older practice of grinding lithium aluminum hydride prior to use can cause explosions and should not be employed.

Shipping

UN1410 Lithium aluminum hydride (dry), Hazard Class: 4.3; Labels: 4.3-Dangerous when wet material. UN1411 Lithium aluminum hydride, ethereal, Hazard Class: 4.3; Labels: 4.3-Dangerous when wet material, 3- Flammable liquid.

Purification Methods

Extract it with Et2O, and, after filtering, the solvent is removed under vacuum. The residue is dried at 60o for 3hours, under high vacuum [Ruff J Am Chem Soc 83 1788 1961]. It is a strong reducing agent. It IGNITES in the presence of a small amount of water and reacts with it EXPLOSIVELY. [Becher in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 805 1963.]

Incompatibilities

Combustible solid. Can ignite spontaneously in moist air or heat. Decomposes on heating @ 125C forming aluminum, lithium hydride and flammable hydrogen gas. A strong reducing agent; violent reaction with oxidizers. Violent reaction with water, alcohols, acids, dimethylether, ethers, tetrahydrofuran, benzoyl peroxide; boron trifluoride etherate. Reduces carbon dioxide or sodium hydrogen carbonate to methane and ethane at elevated temperatures. These flammable or explosive gases can form when CO2 extinguishers are used to fight hydride fires. Forms explosive complexes with ether, dimethylamine and various tetrazoles. Tetrazoles include, 2-methyl, 2-ethyl, 5-ethyl, 2-methyl-5-vinyl, 5-amino-2-ethyl .

Waste Disposal

Small amounts of excess LAH can be destroyed by forming a suspension or solution in an inert solvent such as diethyl ether or hexane, cooling in an ice bath, and slowly and carefully adding ethyl acetate dropwise with stirring. This is followed by the addition of a saturated aqueous solution of ammonium chloride.
Excess lithium aluminum hydride and the products of the treatment described above should be placed in an appropriate container, clearly labeled, and handled according to your institution's waste disposal guidelines. For more information on disposal procedures, see Chapter 7 .

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View Lastest Price from Lithium Aluminum Hydride manufacturers

Cangzhou Lingang Xingchen Chemical Co.,Ltd.
Product
Lithium aluminum hydride in THF 16853-85-3
Price
US $0.00-0.00/kg
Min. Order
100kg
Purity
5% in THF, 10% in THF
Supply Ability
80 tons
Release date
2022-11-07
Hebei Weibang Biotechnology Co., Ltd
Product
Lithium Aluminum Hydride 16853-85-3
Price
US $10.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
1000kg
Release date
2024-11-01
Hebei Yanxi Chemical Co., Ltd.
Product
lithium tetrahydroaluminate 16853-85-3
Price
US $50.00/kg
Min. Order
1kg
Purity
0.99
Supply Ability
10000
Release date
2023-09-19

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  • Lithium aluminium hydride,95%,tablets (ca. 0.6 g)
  • Lithium aluminium hydride,95%,powder
  • Lithium aluminium hydride,15% (3.5M) solutionin toluene/THF
  • Lithium aluminium hydride,1M solution in THF
  • Lithium aluminium hydride,95%,in resealable tin cans
  • Lithium aluminium hydride,97%,tablets
  • Lithium aluminum hydride, 10% in THF
  • Lithium aluminum hydride, 15% in THF/toluene (2.4:1)
  • Lithium aluminum hydride, 4% in THF
  • LITHIUM ALUMINIUM HYDRIDE
  • LITHIUM ALUMINIUM TETRAHYDRIDE
  • LITHIUM ALMINIUM HYDRIDE
  • LITHIUM ALUMINUM HYDRIDE
  • Lithium aluminum hydride, 10% in THF liquid