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Basic Information
CAS No.: 563-79-1
Name: 2,3-Dimethyl-2-butene
Article Data: 304
Molecular Structure:
Molecular Structure of 563-79-1 (2,3-Dimethyl-2-butene)
Formula: C6H12
Molecular Weight: 84.1613
Synonyms: 1,1,2,2-Tetramethylethylene;2,3-Dimethyl-2-butene;NSC 73907;Tetramethylethene;Tetramethylethylene;
EINECS: 209-263-8
Density: 0.697 g/cm3
Melting Point: -75 °C
Boiling Point: 70.92 °C at 760 mmHg
Flash Point: 2°F
Appearance: colourless liquid
Hazard Symbols: FlammableF,HarmfulXn
Risk Codes: 11-65
Safety: 16-33-62-9
Transport Information: UN 3295 3/PG 2
PSA: 0.00000
LogP: 2.36260
Synthetic route
563-78-0

2,3-Dimethyl-1-butene

563-79-1

2,3-Dimethyl-2-butene

Conditions
ConditionsYield
aluminum oxide at -0.1℃; for 0.166667h;95%
x In nitromethane at 25℃; for 0.25h;88%
NiX(21) zeolite at -0.1℃; Rate constant; or ZnX(21) zeolite;
120-12-7

anthracene

188754-05-4

3,3'-bis(3-phenyl-1,1,2,2-tetramethyl-3-silacyclopropane)

A

563-79-1

2,3-Dimethyl-2-butene

B

3,3,4,4-Tetramethyl-1,2-diphenyl-3,4-dihydro-[1,2]disilete

C

C32H32Si2

Conditions
ConditionsYield
In benzene at 150℃; for 2h;A 70%
B n/a
C 85%
100-52-7

benzaldehyde

67-64-1

acetone

A

563-79-1

2,3-Dimethyl-2-butene

B

768-49-0

(2-methyl-1-propenyl)-benzene

C

588-59-0

stilbene

Conditions
ConditionsYield
With tin(IV) chloride; zinc In tetrahydrofuran at 64 - 66℃; for 1h; McMurry Reaction; Inert atmosphere;A n/a
B 85%
C n/a
98-86-2

acetophenone

67-64-1

acetone

A

563-79-1

2,3-Dimethyl-2-butene

B

769-57-3

α,β,β-trimethylstyrene

C

2510-98-7

2,3-diphenyl-2-butene

Conditions
ConditionsYield
With tin(IV) chloride; zinc In tetrahydrofuran at 64 - 66℃; for 1h; McMurry Reaction; Inert atmosphere;A n/a
B 82%
C n/a
67-64-1

acetone

563-79-1

2,3-Dimethyl-2-butene

Conditions
ConditionsYield
With tin(IV) chloride; zinc In tetrahydrofuran at 64 - 66℃; McMurry Reaction; Inert atmosphere;80%
With tungsten(VI) chloride In tetrahydrofuran Ambient temperature; electrolysis;6%
With tetrahydrofuran; titanium(II) hydride; magnesium chloride In tetrahydrofuran at -68 - 20℃;64 % Chromat.
119-61-9

benzophenone

67-64-1

acetone

A

563-79-1

2,3-Dimethyl-2-butene

B

781-33-9

2-methyl-1,1-diphenylpropene

C

632-51-9

1,1,2,2-tetraphenylethylene

Conditions
ConditionsYield
With tin(IV) chloride; zinc In tetrahydrofuran at 64 - 66℃; for 1h; McMurry Reaction; Inert atmosphere;A n/a
B 80%
C n/a
55644-09-2

hexamethylsilirane

563-79-1

2,3-Dimethyl-2-butene

Conditions
ConditionsYield
In benzene at 73℃; for 15h;77%
52393-63-2

4,4,5,5-tetramethylethylene sulphate

563-79-1

2,3-Dimethyl-2-butene

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 20℃; Product distribution; electrolysis, oth. solvent, var. cathodes;66%
55644-09-2

hexamethylsilirane

A

563-79-1

2,3-Dimethyl-2-butene

B

62346-42-3

octamethyl-1,2-disilacyclobutane

Conditions
ConditionsYield
In benzene at 70℃; for 18h;A 62%
B 38%
513-81-5

2,3-dimethyl-buta-1,3-diene

563-79-1

2,3-Dimethyl-2-butene

Conditions
ConditionsYield
With hydrogen; Et4N60%
With bis(pentamethylcyclopentadienyl)titanium(III) hydride; hydrogen In (2)H8-toluene at 80℃; for 40h; Sealed tube;20%
With diethyl ether; ammonia; sodium
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Chemistry

The molecular structure of 2-Butene, 2,3-dimethyl- (CAS NO.563-79-1) is

IUPAC Name: 2,3-Dimethylbut-2-ene 
Molecular Formula: C6H12
Molecular Weight: 84.16
EINECS: 209-263-8
Density: 0.696 g/cm3
Melting Point: -75 ºC
Boiling Point: 70.9 °C at 760 mmHg
Flash Point: -16 ºC
Freely Rotating Bonds: 0
Polar Surface Area: 0 Å2
Index of Refraction: 1.404
Molar Refractivity: 29.58 cm3
Molar Volume: 120.7 cm3
Polarizability: 11.73 10-24 cm3
Surface Tension: 18.4 dyne/cm 
Enthalpy of Vaporization: 29.64 kJ/mol
Vapour Pressure: 138 mmHg at 25°C 
Stability: stable, highly flammable - readily forms explosive mixtures with air. 
Properties: colourless liquid
The Cas Register Number  of 2-Butene, 2,3-dimethyl- is 563-79-1. The chemical synonyms of 2-Butene, 2,3-dimethyl- (CAS NO.563-79-1) are (CH3)2C=C(CH3)2 ; 1,1,2,2-Tetramethylethylene ; 2,3-dimethyl-2-buten ; 2,3-dimethyl-but-2-ene ; 2,3-Dimethylbut-2-ene ; 2,3-Dimethylbutene-2 ; Tetramethylethene ; Tetramethylethylene . Its  product categories are Acyclic ; Alkenes ; Organic Building Blocks .

Uses

 2-Butene, 2,3-dimethyl- (CAS NO.563-79-1) is used as organic intermediate.

Safety Profile

Hazard Codes: FlammableF,HarmfulXn,CorrosiveC
Risk Statements: 11-65-36/37/38-22-19 
R11: Highly flammable. R65:Harmful: may cause lung damage if swallowed. 
R36/37/38: Irritating to eyes, respiratory system and skin. 
R22: Harmful if swallowed. 
R19: May form explosive peroxides.
Safety Statements: 16-33-62-9-36/37/39-26 
S16: Keep away from sources of ignition. 
S33: Take precautionary measures against static discharges. 
S62: If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. 
S9: Keep container in a well-ventilated place. 
S36/37/39: Wear suitable protective clothing, gloves and eye/face protection. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
RIDADR: UN 3295 3/PG 2
WGK Germany: 3
F: 10-23
Hazard Note: Extremely Flammable/Corrosive/Harmful
HazardClass: 3
PackingGroup: II
HS Code: 29012980