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Name	2-Methyl-1-buten-3-yne	EINECS	N/A
CAS No.	78-80-8	Density	0.695 g/mL at 25 °C(lit.)
PSA	0.00000	LogP	1.19570
Solubility	N/A	Melting Point	-113 °C
Formula	C5H6	Boiling Point	32 °C(lit.)
Molecular Weight	66.1026	Flash Point	20 °F
Transport Information	N/A	Appearance	Clear colorless to light yellow liquid
Safety	Poison by ingestion. Mildly toxic by inhalation. A skin irritant. A very dangerous fire hazard when exposed to heat or flame. When heated to decomposition it emits acrid smoke and irritating fumes. See also ACETYLENE COMPOUNDS and ALKYNES.	Risk Codes	R12; R20/22; R36/37/38; R65
Molecular Structure		Hazard Symbols	F+,Xn,Xi
Synonyms	2-Methyl-1-buten-3-yne;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; NSC9296; Valylene	Article Data	69

2-Methyl-1-buten-3-yne Chemical Properties

Product Name: 2-Methyl-1-buten-3-yne (CAS NO.78-80-8)

Molecular Formula: C₅H₆
Molecular Weight: 66.1g/mol
Mol File: 78-80-8.mol
Einecs: 201-144-9
Appearance: Clear colorless to light yellow liquid
Melting Point: -113 °C
Boiling point: 31.7 °C at 760 mmHg
Storage Temperature: 2-8°C
Density: 0.695 g/mL at 25 °C(lit.)
Refractive index: n20/D 1.416(lit.)
Surface Tension: 22.4 dyne/cm
Enthalpy of Vaporization: 26.56 kJ/mol
Vapour Pressure: 598 mmHg at 25°C
XLogP3-AA: 1.9
H-Bond Donor: 0
H-Bond Acceptor: 0

2-Methyl-1-buten-3-yne Toxicity Data With Reference

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
mouse	LC50	inhalation	12600mg/m3 (12600mg/m3)	BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY) BEHAVIORAL: ATAXIA LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES	Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 31(4), Pg. 55, 1987.
mouse	LD	intraperitoneal	> 500mg/kg (500mg/kg)		"Summary Tables of Biological Tests," National Research Council Chemical-Biological Coordination Center. Vol. 8, Pg. 100, 1956.
mouse	LD50	oral	350mg/kg (350mg/kg)		Shell Chemical Company. Unpublished Report. Vol. -, Pg. 6, 1961.
rat	LDLo	oral	639mg/kg (639mg/kg)		Shell Chemical Company. Unpublished Report. Vol. -, Pg. 6, 1961.

2-Methyl-1-buten-3-yne Safety Profile

Poison by ingestion. Mildly toxic by inhalation. A skin irritant. A very dangerous fire hazard when exposed to heat or flame. When heated to decomposition it emits acrid smoke and irritating fumes. See also ACETYLENE COMPOUNDS and ALKYNES.
Safety Information of 2-Methyl-1-buten-3-yne (CAS NO.78-80-8):
Hazard Codes: F+,Xn,F,Xi
Risk Statements: 12-20/22-36/37/38-65
12: Extremely Flammable
20: Harmful by inhalation
22: Harmful if swallowed
36: Irritating to the eyes
37: Irritating to the respiratory system
38: Irritating to the skin
65: Harmful: May cause lung damage if swallowed
Safety Statements: 16-26-36/37-62
16: Keep away from sources of ignition - No smoking
26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36: Wear suitable protective clothing
37: Wear suitable gloves
62: If swallowed, do not induce vomiting: seek medical advice immediately and show this container or label

2-Methyl-1-buten-3-yne Specification

2-Methyl-1-buten-3-yne ,its CAS NO. is 78-80-8,the synonyms is 1-Butene-3-yne, 2-methyl- ; 2-Methyl-1-butenyne ; 2-Methylbutenyne ; 3-Methyl-3-buten-1-yne ; CH₂=C(CH₃)CequivCH ; Valylene ; Isopropenylacetylene .

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