Dicyanoacetylene

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Dicyanoacetylene
Names
IUPAC name
But-2-ynedinitrile
Other names
Acetylenedicarbonitrile
Butynedinitrile
Dicyanoacetylene
Properties
C4N2
Molar mass 76.06 g/mol
Appearance Colorless volatile liquid
Density 1.176 g/cm3
Melting point 20.5 °C (68.9 °F; 293.6 K)
Boiling point 76.5 °C (169.7 °F; 349.6 K)
Thermochemistry
500.4 kJ/mol
Hazards
Related compounds
Related compounds
Acetylene
Cyanogen
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Dicyanoacetylene, also known as carbon subnitride or but-2-ynedinitrile, is a chemical compound with the formula C4N2.

Properties

Chemical

Dicyanoacetylene burns when mixed with oxygen giving a bright blue-white flame at a temperature of 4990 °C (5260 K, 9010 °F), which is the hottest flame of any known chemical reaction.

Physical

Dicyanoacetylene is a flammable colorless liquid.

Availability

Dicyanoacetylene is hard to find, and there don't appear to be any sellers that would sell to individuals.

Preparation

There are several ways to produce dicyanoacetylene, neither methods being very easy.

A common industrial route involves passing dry nitrogen gas over a sample of graphite heated to temperatures between 2400 and 2700 °C.

Dehydration of acetylene dicarboxyamide with phosphorus pentoxide will give carbon subnitride. Maximum yield from this process is 40%.[1]

A dangerous route involves the reaction of cyanogen chloride or cyanogen bromide (which can be obtained by reacting chlorine or bromine with sodium cyanide) with a carbide, such as sodium or calcium carbide. The resulting dicyanoacetylene is purified from the resulting reaction products. Due to the high toxicity of the cyanogens, this reaction is not safe to perform without proper equipment.

Projects

  • Make the hottest flame known to man
  • Reagent for Diels-Alder reactions with unreactive dienes[2]

Handling

Safety

Dicyanoacetylene is flammable. It has relative low toxicity.

Storage

Dicyanoacetylene should be kept in closed containers, away from light and oxygen, as it may polymerize. Gas cylinders are a good choice.

Disposal

Dicyanoacetylene can be safely burned outside. Be careful, as the flame is very hot.

References

  1. Dunn, Peter J.; Rees, Charles W.; Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999); (1987); p. 1579 - 1584
  2. http://www.lookchem.com/Dicyanoacetylene/

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