ChemicalBook CAS DataBase List 97-94-9

97-94-9

Name	Triethylborane
CAS	97-94-9
EINECS(EC#)	202-620-9
Molecular Formula	C6H15B
MDL Number	MFCD00009022
Molecular Weight	97.99
MOL File	97-94-9.mol

Synonyms

Boron ethyl BORON TRIETHYL TRIETHYLBORANE TRIETHYLBORON (C2H5)3B borane,triethyl- Borethyl triethyl-boran triethylborane,teb triethylborane,teb,inhexanes triethylborane,teb,intetrahydrofuran triethylborane-1,3-diaminopropane triethylborane-1,3-diaminopropanecomplex,teb-dap Triethylborine Triethylborane, in hexanes, 1M solution Triethylborane, in tetrahydrofuran Triethylborane-1,3-diaminopropane complex TRIETHYLBORANE SOLUTION, ~1 M IN THF TRIETHYLBORANE SOLUTION, ~15% IN HEXANE TRIETHYLBORANE, 95+%

Chemical Properties

Appearance	CLEAR COLOURLESS TO LIGHT AMBER SOLUTION
Melting point	-92°C
Boiling point	95°C
density	0.865 g/mL at 25 °C
vapor pressure	67hPa at 25℃
refractive index	n20/D 1.380
Fp	1 °F
storage temp.	0-6°C
form	Liquid
color	Colorless to light amber
Water Solubility	Decomposes
Specific Heat Capacity	Cp(liquid):241.2J/(g·K),at 25℃
Sensitive	Air Sensitive
Merck	9668
BRN	1731462
Exposure limits	ACGIH: TWA 50 ppm; STEL 100 ppm (Skin) OSHA: TWA 200 ppm(590 mg/m3) NIOSH: IDLH 2000 ppm; TWA 200 ppm(590 mg/m3); STEL 250 ppm(735 mg/m3)
InChI	1S/C6H15B/c1-4-7(5-2)6-3/h4-6H2,1-3H3
InChIKey	LALRXNPLTWZJIJ-UHFFFAOYSA-N
SMILES	CCB(CC)CC
CAS DataBase Reference	97-94-9(CAS DataBase Reference)
NIST Chemistry Reference	Borane, triethyl-(97-94-9)
Storage Precautions	Store under nitrogen
EPA Substance Registry System	97-94-9(EPA Substance)

Safety Data

Symbol(GHS)	GHS02,GHS05,GHS06
Signal word	Danger
Hazard statements	H250-H301-H314
Precautionary statements	P231+P232-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P370+P378
Hazard Codes	F+,C,N,F
Risk Statements	R12:Extremely Flammable. R17:Spontaneously flammable in air. R19:May form explosive peroxides. R22:Harmful if swallowed. R34:Causes burns. R66:Repeated exposure may cause skin dryness or cracking. R67:Vapors may cause drowsiness and dizziness. R65:Harmful: May cause lung damage if swallowed. R62:Possible risk of impaired fertility. R51/53:Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment . R48/20:Harmful: danger of serious damage to health by prolonged exposure through inhalation . R11:Highly Flammable. less more
Safety Statements	S7:Keep container tightly closed . S9:Keep container in a well-ventilated place . S16:Keep away from sources of ignition-No smoking . S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) . S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice . S29:Do not empty into drains . S33:Take precautionary measures against static discharges . S36/37/39:Wear suitable protective clothing, gloves and eye/face protection . S43:In case of fire, use ... (indicate in the space the precise type of fire-fighting equipment. If water increases the risk add-Never use water) . S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . S61:Avoid release to the environment. Refer to special instructions safety data sheet . S62:If swallowed, do not induce vomiting: seek medical advice immediately and show this container or label . less more
RIDADR	UN 3399 4.3/PG 2
WGK Germany	2
RTECS	ED2100000
F	2-10
TSCA	Yes
REACH Registrations	Active
HazardClass	3
PackingGroup	II
HS Code	29319090
Storage Class	4.3 - Hazardous materials which set free flammable gases upon contact with water
Hazard Classifications	Aquatic Chronic 2 Asp. Tox. 1 Eye Dam. 1 Flam. Liq. 2 Repr. 2 Skin Corr. 1A STOT RE 1 Inhalation STOT SE 3
Safety Profile	Poison by ingestion and intraperitoneal routes. Mildly toxic by inhalation. Animal experiments show that the vapor is a poison which causes pulmonary irritation and convulsions. A very dangerous fire hazard by spontaneous chemical reaction with oxichzers. Spontaneously flammable in air. Explodes in oxygen atmospheres. Hypergolic reaction with triethylaluminum. Ignites on contact with chlorine, bromine, or other halogens. Will react with water or steam to produce toxic and flammable vapors. To fight fire, do NOT use halogenated extinguishing agents. When heated to decomposition or upon contact with air it emits toxic acrid smoke and irritating fumes. See also BORANES and BORON COMPOUNDS. less more
Hazardous Substances Data	97-94-9(Hazardous Substances Data)
Toxicity	LD50 orl-rat: 235 mg/kg 14KTAK -,693,64 less more

Raw materials And Preparation Products

Hazard Information

Chemical Properties

Clear colourless to light amber solution. Miscible with most organic solvents; immiscible with water.

Uses

It is used in mixtures with triethylaluminumas hypergolic igniters in rocket propulsionsystems.

Uses

Reagent in organic syntheses blocking agent and radical initiator.

Preparation

Triethylborane is prepared by reacting triethylaluminium with boron halides or by reacting diborane with ethylene:
(C₂H₅)₃Al + BCl₃ → (C₂H₅)₃B + AlCl₃
B₂H₆ + CH₂=CH₂ → (C₂H₅)₃B

Synthesis Reference(s)

The Journal of Organic Chemistry, 51, p. 427, 1986 DOI: 10.1021/jo00354a002

Hazard

Flammable, dangerous fire risk, ignites spontaneously in air. Reacts violently with water and oxidizing materials. Toxic by inhalation, strong irritant.

Health Hazard

Triethylboron is a toxic substance. The toxicsymptoms from chronic exposure to thiscompound are not reported. Skin contact canburn tissues.

Fire Hazard

Triethylborane is a pyrophoric substance, igniting spontaneously on exposure to air, chlorine, or bromine. Explosion may result when mixed with oxygen. Contact with ozone, peroxides and other oxidants can cause explosion. Its concentrated solutions can be pyrophoric. Flash point of 1 M solution in hexane is －23°C ( －9°F), while that in tetrahydrofuran is －17°C (1°F) (Aldrich 1996). It decomposes explosively when mixed with water.

Flammability and Explosibility

Pyrophoric

reaction suitability

reagent type: reductant

Purification Methods

It distils at 56-57o/220mm. It can also be purified via its ammonia addition complex which is distilled in a high vacuum, decomposed with dry HCl, and the Et3B is distilled out. It is commercially available as a 15% solution in hexane or as 1M solution in hexane. [Brown J Am Chem Soc 67 376 1945, Bamford et al. J Chem Soc 471 1946, Lin et al. J Organomet Chem 312 277 1986, Beilstein 4 III 1957, 4 IV 4359.]

Material Safety Data Sheet(MSDS)

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