2-Methyl-1-buten-3-yne
[CAS# 78-80-8]

Identification

• Classification: Chemical reagent >> Organic reagent >> Alkyne
• Name: 2-Methyl-1-buten-3-yne
• Synonyms: 2-Methyl-1-butene-3-yne; 2-Methyl-1-butenyne; 2-Methylbutenyne; 3-Methyl-3-buten-1-yne; 3-Methyl-3-butene-1-yne; Isopropenylacetylene; NSC 9296; Valylene
• Molecular Formula: C₅H₆
• Molecular Weight: 66.10
• CAS Registry Number: 78-80-8
• EC Number: 201-144-9

Properties

• Solubility: Slightly soluble (1.7 g/L) (25 ºC), Calc.^*
• Density: 0.7064 g/cm³ (20 ºC)^**
• Melting point: -113 ºC^***
• Boiling point: 35-38 ºC^****
• Refractive index: 1.4780 (20 ºC)^*****
• Flash point: -6.7±0.0 ºC, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2017 ACD/Labs)

^** Petrov, A. A.; Zhurnal Obshchei Khimii 1957, V27, P2081-7.

^*** "PhysProp" data were obtained from Syracuse Research Corporation of Syracuse, New York (US)

^**** Nazarov, I. N.; Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya 1958, P335-8.

^***** Melikyan, G. G.; Khimiya Geterotsiklicheskikh Soedinenii 1982, (1), P19-23.

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335
Eye irritation	Eye Irrit.	2	H319
Acute toxicity	Acute Tox.	4	H302
Acute toxicity	Acute Tox.	4	H332
Flammable liquids	Flam. Liq.	1	H224
Aspiration hazard	Asp. Tox.	1	H304
Chronic hazardous to the aquatic environment	Aquatic Chronic	4	H413
Eye irritation	Eye Irrit.	2A	H319
Self-reactive substances or mixtures	Self-react.	F	H242