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2,3-Dimethyl-2-butene

2,3-Dimethyl-2-butene structure

CAS No:
563-79-1
Formula:
C6H12
Chemical Name:
2,3-Dimethyl-2-butene
Synonyms:
2-Butene,2,3-dimethyl-;2,3-Dimethyl-2-butene;Tetramethylethylene;1,1,2,2-Tetramethylethylene;Tetramethylethene;NSC 73907
Categories:
Agrochemicals > Pesticide Intermediates

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Description

colourless liquid

2,3-Dimethyl-2-butene Basic Attributes

Molecular Weight：

84.16

Exact Mass：

84.16

BRN：

1361357

EC Number：

209-263-8

NSC Number：

73907

UN Number：

1993

DSSTox ID：

DTXSID2060339

HScode：

29012980

Characteristics

PSA：

XLogP3：

3.47

Appearance：

Clear colorless to slightly yellow Liquid

Density：

0.7075 g/cm³ @ Temp: 20 °C

Melting Point：

-74.6 °C

Boiling Point：

73.3 °C

Flash Point：

2 °F

Refractive Index：

1.405

Water Solubility：

soluble in water (0.071 g/L)

Storage Conditions：

2-8°C

Vapor Pressure：

215 mm Hg ( 37.7 °C)

Explosive limit：

1.2%(V)

OH：

1.10e-10 cm3/molecule*sec

Safety Information

Packing level：

Hazard category：

Transport codes：

UN 3295 3/PG 2

wgk germany：

hazard class code：

11-65-36/37/38-22-19-40-36/37

safety instructions：

16-33-62-9-36/37/39-26-36/37

Marks：

F,Xn,C

Hazard note：

Extremely Flammable/Corrosive/Harmful

Stability/Shelf Life：

Stable. Highly flammable - readily forms explosive mixtures with air. Note low flash point. Incompatible with strong acids, strong oxidizing agents, peroxy compounds.

Precautionary statement(s)：

P210, P233, P240, P241, P242, P243, P280, P301+P310, P303+P361+P353, P331, P370+P378, P403+P235, P405, P501

Hazard Statements：

H225

Fire Hazards：

Flammable - 3rd degree, Reactive - 1st degree

GHS Classification：

|Danger|H225 (100%): Highly Flammable liquid and vapor [Danger Flammable liquids]|P210, P233, P240, P241, P242, P243, P280, P301+P310, P303+P361+P353, P331, P370+P378, P403+P235, P405, and P501|Aggregated GHS information provided by 49 companies from 4 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Drug Information

MeSH Entry Terms：

2,3-dimethyl-2-butene

2,3-Dimethyl-2-butene Use and Manufacturing

Methods of Manufacturing

Tetramethylethylene is obtained by the dimerization of propylene. Put propylene into the dimerization kettle, add homogeneous catalyst, and carry out catalytic polymerization under stirring. When the pressure in the kettle drops below 0.01MPa, the material will stop reacting. , The oil layer is roughly steamed to remove the products of trimerization and tetramerization, namely C9～C19. For olefins, the fractions at 53～75℃ are collected as crude products, which are mainly 2, 3-dimethylbutene-1, which is then catalytically isomerized. The reaction temperature is controlled at 85～90℃, so that the product is converted into 2 , 3-Dimethylbutene-2, namely tetramethylbutene-2, and then rectify to collect the 71～74℃ fraction, which is the finished product 2, 3-dimethylbutene-2, and the rest is Other by-products are C6 olefins. In the dimerization reaction, the single-pass conversion rate of propylene is >90%, the dimerization selectivity is 80%, and the isomerization conversion rate is 79%.

Uses

Used in the production of chrysanthemic acid and spices

Manufacturing Info：

2-Butene, 2,3-dimethyl-: ACTIVE

Use Classification：

Fire Hazards -> Flammable - 3rd degree, Reactive - 1st degree

Computed Properties

Molecular Weight:84.16
XLogP3:2.9
Exact Mass:84.093900383
Monoisotopic Mass:84.093900383
Heavy Atom Count:6
Complexity:50.1
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes

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