Physical Properties Uses Preparation Reactions
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Lithium borohydride

Physical Properties Uses Preparation Reactions
Product Name
Lithium borohydride
CAS No.
16949-15-8
Chemical Name
Lithium borohydride
Synonyms
PQHL;LiBH4;Lithiumboranat;Lithiumborhydrid;LITHIUM BORANATE;lithium:boron(1-);LithiuM borohydrid;ithium borohydride;LITHIUM BOROHYDRIDE;Lityium borohydride
CBNumber
CB8732729
Molecular Formula
BH4Li
Formula Weight
21.78
MOL File
16949-15-8.mol
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Lithium borohydride Property

Melting point:
280 °C
Boiling point:
66°C/760mmHg
Density 
0.896 g/mL at 25 °C
Flash point:
−1 °F
storage temp. 
water-free area
solubility 
Soluble in ether, THF, and aliphatic aminesSoluble in ether, tetrahydrofuran, aliphatic amines and ethanol.
form 
Powder
color 
White
Specific Gravity
0.66
explosive limit
4.00-75.60%(V)
Water Solubility 
soluble H2O above pH 7, ether, tetrahydrofuran, aliphatic amines [MER06]
Sensitive 
Air & Moisture Sensitive
Merck 
14,5525
CAS DataBase Reference
16949-15-8(CAS DataBase Reference)
NIST Chemistry Reference
Lithium tetrahydroborate(16949-15-8)
EPA Substance Registry System
Borate(1-), tetrahydro-, lithium (16949-15-8)
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Safety

Hazard Codes 
F,T,C,Xn,F+
Risk Statements 
14/15-23/24/25-34-20/21/22-11-40-36/37/38-19-67-66-22-12
Safety Statements 
26-36/37/39-43-45-36/37-16
RIDADR 
UN 3399 4.3/PG 1
WGK Germany 
2
RTECS 
ED2725000
10-21
TSCA 
Yes
HS Code 
2850 00 20
HazardClass 
4.3
PackingGroup 
I
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H224Extremely flammable liquid and vapour

H225Highly Flammable liquid and vapour

H260In contact with water releases flammable gases which may ignite spontaneously

H301Toxic if swalloed

H302Harmful if swallowed

H311Toxic in contact with skin

H314Causes severe skin burns and eye damage

H315Causes skin irritation

H318Causes serious eye damage

H319Causes serious eye irritation

H331Toxic if inhaled

H335May cause respiratory irritation

H336May cause drowsiness or dizziness

H351Suspected of causing cancer

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

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

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

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

P231+P232Handle under inert gas. Protect from moisture.

P310Immediately call a POISON CENTER or doctor/physician.

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.

P370+P378In case of fire: Use … for extinction.

P422Store contents under …

P402+P404Store in a dry place. Store in a closed container.

P403+P235Store in a well-ventilated place. Keep cool.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
62460
Product name
Lithium borohydride
Purity
≥95.0%
Packaging
5 g
Price
$92.3
Updated
2021/03/22
Sigma-Aldrich
Product number
222356
Product name
Lithium borohydride
Purity
≥90%
Packaging
10g
Price
$155
Updated
2021/03/22
Sigma-Aldrich
Product number
222356
Product name
Lithium borohydride
Purity
≥90%
Packaging
1g
Price
$31.7
Updated
2021/03/22
Sigma-Aldrich
Product number
62460
Product name
Lithium borohydride
Purity
≥95.0%
Packaging
25 g
Price
$282
Updated
2021/03/22
Alfa Aesar
Product number
032563
Product name
Lithium borohydride, 95%
Packaging
10g
Price
$234
Updated
2020/06/24
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Lithium borohydride Chemical Properties,Usage,Production

Physical Properties

White orthorhombic crystals; density 0.67 g/cm3; decomposes in moist air; melts at 268°C; decomposes at 380°C; reacts with water; dissolves in ether, tetrahydrofuran, and diethylamine; solubility in ether, 25g/L at 25°C.

Uses

Lithium borohydride is used as a strong reducing agent. Its principal applications are in organic syntheses for reducing carbonyl groups such as aldehydes, ketones, and esters. It also is used for selectively reducing a carbonyl group in the presence of a nitrile group. Such selective reduction cannot be achieved with lithium aluminum hydride, which is a much stronger reducing agent. The compound also is used to detect free carbonyl groups in proteins and peptides.

Preparation

Lithium borohydride is prepared by reacting ethyllithium with aluminum borohydride:
C2H5Li + Al(BH4)3→3LiBH4 + Al(C2H5)3
Alternatively, the compound may be obtained by the reaction of ethyllithium with diborane:
C2H5Li + B2H6→LiBH4 + C2H5BH2

Reactions

Lithium borohydride reacts with water with liberation of hydrogen:
LiBH4 + 2H2O → LiBO2 + 4H2
Reaction with methanol yields lithium boromethoxide and hydrogen:
LiBH4 + 2CH3OH → LiB(OCH3)2 + 3H2
Reaction with hydrogen chloride yields diborane, lithium chloride and hydrogen:
2LiBH4 + 2HCl → 2LiCl + B2H6 + 2H2
Reactions with oxidizing agents are violent.

Chemical Properties

WHITE POWDER

Physical properties

White orthorhombic crystals; density 0.67 g/cm3; decomposes in moist air; melts at 268°C; decomposes at 380°C; reacts with water; dissolves in ether, tetrahydrofuran, and diethylamine; solubility in ether, 25g/L at 25°C.

Uses

Strong reducing agent. Used in the reduction of Compounds contg ketonic, aldehydic, or ester carbonyls and a nitrile group, where reduction of the carbonyl, but not of the nitrile group, is wanted. In the determination of free carboxyl groups in peptides and proteins; after esterification and acetylation, only the ester groups, and none of the peptide bonds are reduced.

General Description

A white to grayish crystalline powder.

Air & Water Reactions

Likely to ignite when moistened with water [Lab. Gov. Chemist 1965].

Reactivity Profile

Lithium borohydride is a strong reducing agent. Is easily ignited and burns vigorously once ignited. Reacts on contact with water or acids to form hydrogen gas and corrosive products. Reaction with limited amounts of water or moisture may cause ignition after a delay [Gaylord, 1965, p. 22].

Health Hazard

Inhalation or contact with vapors, substance or decomposition products may cause severe injury or death. May produce corrosive solutions on contact with water. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.

Fire Hazard

Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.

Safety Profile

Poison by ingestion, inhalation, and skin contact. Flammable; can liberate H2. Incompatible with H20 as moisture on fibers of cellulose or as liquid. See also LITHIUM, BORON COMPOUNDS, and HYDRIDES.

Purification Methods

It is crystallised from Et2O, and pumped free of ether at 90-100o during 2hours [Schaeffer et al. J Am Chem Soc 78 729 1956]. Store it dry as it decomposes slowly in moist air. [Becher in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 775 1963.]

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