2-Butyne
[CAS# 503-17-3]

Identification

• Classification: Chemical reagent >> Organic reagent >> Alkyne
• Name: 2-Butyne
• Synonyms: 2-Butine; Dimethylacetylene
• Molecular Formula: C₄H₆
• Molecular Weight: 54.09
• CAS Registry Number: 503-17-3
• EC Number: 207-962-2

Properties

• Solubility: Slightly soluble (1.8 g/L) (25 ºC), Calc.^*
• Density: 0.715 g/cm³ (0 ºC)^**
• Melting point: 122-126 ºC^***
• Boiling point: 80.8-81.1 ºC^****
• Refractive index: 1.3975 (589.3 nm 16 ºC)^*****
• Flash point: -48.5±11.2 ºC, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2016 ACD/Labs)

^** Heisig, G. B.; Journal of the American Chemical Society 1935, V57, P339-40.

^*** Colton, Frank B.; US 3068249 1962.

^**** Kharasch, Norman; Journal of the American Chemical Society 1953, V75, P1081-2.

^***** Gredy, Blanche; Ann. chim. [11] 1935, V4, P5-82.

Safety Data

• Hazard Symbols: F+;Xi
• Risk Codes: R12;R36/37/38
• Safety Description: S16;S26;S36

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Flammable liquids	Flam. Liq.	1	H224
Eye irritation	Eye Irrit.	2	H319
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335

• Transport Information: UN 1144 - class 3 - PG 1 - Crotonylene