acetone dry ice get you down to -78C....acetone is always handy!symboom - 24-1-2012 at 18:27
alright ill try acetone
here is the synthesis
dicyanoacetylene
carbon subnitride is a clear liquid.
Because of its high endothermic heat of formation,
it can explode to carbon powder and nitrogen gas,
and it burns in oxygen with a bright blue-white flame
at a temperature of 9010 °F
which is the hottest flame of any chemical.
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The precursor acetylene dicarboxylate can be made
by a bromination of maleic acid, followed by
dehydrohalogenation. Alternatively it can be
made by reacting acetylene with finely dispersed sodium
metal or sodamide, then pouring the suspension over dry ice.
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history
first prepared by the dehydration of the bisamide
of acetylenedicarboxylic acid
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The acid was first described in 1877 by Polish
chemist Ernest Bandrowski.[2][3][4] It can be
obtained by treating a,ß-dibromosuccinic acid
with potassium hydroxide KOH in methanol or ethanol.
The reaction yields potassium bromide
and potassium acetylenedicarboxylate.
The salts are separated
and the latter is treated with sulfuric acid.
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the gas phase pyrolysis of
1,2-dichloro-1,2-dicyanoethylene
affords carbon subnitride and chlorine
but products recombine at low temperatures
that they must be separated immediatly
atempted
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the two other reactions are
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The retro-diene cleavege of
dimethyl 5,6- and so on
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*and the reaction of
Dicyanoacetylene can be prepared by passing
nitrogen gas over a sample of graphite heated
by an electric arc to temperatures between 4351F to 4940F
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we have found that dicyanoacetylene is formed
on gas phase pyrolysis of tetracyanoethylene,
4,5-dicyano-1,3-dithiol-2-one
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4,5-dicyano-1,3-dithiol-2-thione
pyrothesis of this is the best
and most convenient synthetic method
[Edited on 25-1-2012 by symboom]AirCowPeaCock - 24-1-2012 at 19:29
