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Lithium borohydride

Physical Properties Uses Preparation Reactions
Lithium borohydride
Lithium borohydride structure
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

Lithium borohydride Properties

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)
EWG's Food Scores
1
FDA UNII
8L87X4S4KP
NIST Chemistry Reference
Lithium tetrahydroborate(16949-15-8)
EPA Substance Registry System
Borate(1-), tetrahydro-, lithium (16949-15-8)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS02,GHS07,GHS05,GHS06,GHS08
Signal word  Danger
Hazard statements  H318-H224-H302-H315-H319-H336-H260-H301-H311-H314-H331-H225-H302+H332-H335-H351-H301+H311+H331
Precautionary statements  P210-P261-P305+P351+P338-P223-P231+P232-P280-P370+P378-P422-P402+P404-P403+P235-P303+P361+P353-P310-P370+P378i
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
NFPA 704
3
3 3
W

Lithium borohydride price More Price(20)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 62460 Lithium borohydride ≥95.0% 16949-15-8 5 g $92.3 2021-03-22 Buy
Sigma-Aldrich 222356 Lithium borohydride ≥90% 16949-15-8 10g $155 2021-03-22 Buy
Sigma-Aldrich 222356 Lithium borohydride ≥90% 16949-15-8 1g $31.7 2021-03-22 Buy
Sigma-Aldrich 62460 Lithium borohydride ≥95.0% 16949-15-8 25 g $282 2021-03-22 Buy
Alfa Aesar 032563 Lithium borohydride, 95% 16949-15-8 10g $234 2020-06-24 Buy

Lithium borohydride Chemical Properties,Uses,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.]

Lithium borohydride Preparation Products And Raw materials

Raw materials

Preparation Products

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