2-Butyne Chemical Properties

Melting point:

-32 °C

Boiling point:

27 °C(lit.)

Density 

0.691 g/mL at 25 °C(lit.)

vapor pressure 

11.47 psi ( 20 °C)

refractive index 

n20/D 1.393(lit.)

Flash point:

-25 °C

storage temp. 

2-8°C

form 

Liquid

Specific Gravity

0.691

color 

Clear colorless to light yellow

Water Solubility 

Not miscible in water.

BRN 

1361340

CAS DataBase Reference

503-17-3(CAS DataBase Reference)

EPA Substance Registry System

2-Butyne (503-17-3)

Safety Information

Hazard Codes 

F+,Xi

Risk Statements 

12-36/37/38

Safety Statements 

16-26-36

RIDADR 

UN 1144 3/PG 1

WGK Germany 

3

RTECS 

GQ7210000

TSCA 

Yes

HazardClass 

3

PackingGroup 

I

HS Code 

29012990

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS
• Language:English Provider:ALFA

2-Butyne Usage And Synthesis

Chemical Properties

clear colorless to light yellow liquid

Uses

2-Butyne is used to synthesize alkylated hydroquinones in the total synthesis of Vitamin E. It is also used as pharmaceutical intermediates.

General Description

A clear colorless liquid with a petroleum-like odor. Flash point below -4°F. Boiling point 81°F. Less dense than water and insoluble in water. Vapors heavier than air.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

2-Butyne may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release hydrogen gas. In the presence of various catalysts (such as acids) or initiators, may undergo exothermic addition polymerization reactions.

Hazard

Flammable, dangerous fire risk. Moderate explosion hazard.

Health Hazard

Inhalation or contact with material may irritate or burn skin and eyes. Fire may produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Safety Profile

A simple asphyxiant. Very dangerous fire hazard when exposed to heat or flame; can react with oxidzing materials. Moderately explosive in the form of vapor when exposed to heat or flame. To fight fire, use foam, CO2, dry chemicals. See also ACETYLENE COMPOUNDS and ARGON (for a description of simple asphyxiants).

Purification Methods

Stand it over sodium for 24hours, then fractionally distil it under reduced pressure into a cooled receiver. [Beilstein 1 IV 971.]

2-Butyne(503-17-3)Related Product Information

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