Butanediyne

Organic compound

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

Diacetylene is an organic compound, also known as diacetylenes , chemical formula is C4H2, molecular weight is 50.05868. It is the simplest compound with two triple bonds.

It is a very active substance and easy to polymerize. Mixed with air can form Explosive mixture 。 It is easy to burn and explode in case of open fire and high heat. Explosive decomposition may occur at 2-20kPa atmospheric pressure.

Chinese name: Butanediyne
Foreign name: Diacetylene；1,3-butadiyne
Alias: diacetylenes
chemical formula: C4H2
molecular weight: fifty point zero five eight six eight
CAS login number: 460-12-8
EINECS login number: 207-303-9
Melting point: -36 ℃

Boiling point: ten point three
Water solubility: Insoluble in water, soluble in ethanol, soluble in ether
Density: zero point eight zero six
Appearance: Colourless gas
Application: For organic synthesis
UN dangerous goods number: three thousand one hundred and sixty-one
Molar refractive index: sixteen point two three
Refractive index: one point four three six

catalog

four synthesis
five Hazards
six Storage and transportation characteristics

seven security information
eight Calculate chemical data

essential information

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1,3-butylene

Diacetylene belongs to unsaturated fatty hydrocarbon, and its characteristic vibration spectrum has been Titan And on Protoplanetary nebula CRL 618 identification. adopt acetylene and Ethynyl (C2H) and acetylene photolysis In turn, this free radical can attack the triple bond of acetylene, and even react effectively at low temperatures. Butylene has also been detected on the moon.

Physical and chemical properties

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Appearance and property: colorless gas, with acute toxicity

Melting point (℃): - 36

Boiling point (℃): 10.3

Refractive index: 1.436

Relative density (water=1): 0.806

Upper explosive limit% (V/V): 100

Lower explosive limit% (V/V): 1.5

Solubility: insoluble in water, soluble in ethanol, soluble in ether.

Molar volume: 62 cm three

Main purpose

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1. Make it into Sodium acetylene Later available with Haloalkane , ketone and other reactions;

2. Is important Organic synthesis Reagents.

synthesis

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The compound can be synthesized by 1,4-Dichloro-2-butylene As raw material, and Potassium hydroxide Dehydrochloride (in alcohol medium) is prepared at low temperature, Chemical equation As follows:

Hazards

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Health hazard: It has simple suffocation and weak anesthetic effect.

Environmental hazard: It is harmful to the environment and may cause pollution to the atmosphere.

Flammability hazard: This product is flammable and suffocating.

Storage and transportation characteristics

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The warehouse is ventilated and dry at low temperature; Store separately from oxidants, silver nitrate and acids; It is not easy to store for a long time to prevent polymerization.^[1]