Ritter
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3,4-Dicyanofuroxane (DCFO)
US3832249 discloses the preparation & use of DCFO as a safe, castable explosive for use in shaped explosives such as shaped charges & EFPs.
Detonation occurs via a blasting cap.
It is said to be 'extremely stable & safe, and insensitive to heat (below its boiling point of 200 deg) & insensitive to impact'.
While the synthesis details are a little sketchy, they seem fairly straightforward. See attached ChemDraw. The reaction goes to near completion in a
few hours. The acidic fraction is then extracted with CHCl3 or DCM. The solvent is then removed using vacuum. Nothing is mentioned about adjusting the
pH before isolating the DCFO.
Ritter
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\"The production of too many useful things results in too many useless people.\"
Karl Marx
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Sauron
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That's a 1974 patent to Avro.
Has this explosive ever been marketed commercially? Adopted by the military?
If not, why not?
Surely one of our boom-boffins will know.
Sic gorgeamus a los subjectatus nunc.
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Ritter
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| Quote: | Originally posted by Sauron
That's a 1974 patent to Avro.
Has this explosive ever been marketed commercially? Adopted by the military?
If not, why not?
Surely one of our boom-boffins will know. |
I thought it odd that it is so easy to prepare & has such unique characteristics yet had not been discussed here.
Ritter
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\"The production of too many useful things results in too many useless people.\"
Karl Marx
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Axt
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40°C melting point by itself is too low, performance 85% of TNT and a whole lot more expensive.
Interesting none the less, and some of its derivatives look attractive as well. I'll attach the abstracts from scifindr.
I've previously posted the preparation of nitrocyanofuroxan from citric acid in the <a
href="http://www.sciencemadness.org/talk/viewthread.php?tid=2969&page=1">thread on diisonitrosoacetone</a>. It also has a low melting
point 48-49°C and far higher performance, calculated at near 9000m/s.
The following should give the prep of DCFO from <a
href="http://www.sciencemadness.org/talk/viewthread.php?tid=5813&page=1#pid75838">diaminofurazan</a>, more attractive to the amateur then
cyanoacetic acid and tetrachloroacetic acid. I dont have access to it.
<b>Novel synthesis of 3,4-dicyanofuroxan</b>
Tat'yana M. Mel'nikova, Tat'yana S. Novikova, Lenor I. Khmel'nitskii, Aleksei B. Sheremetev, Mendeleev Commun., 2001, 30
DOI: 10.1039/X0011030
Attachment: dicyanofuroxan scifin.pdf (182kB)
This file has been downloaded 2637 times
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JohnWW
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| Quote: | Originally posted by Ritter
US3832249 discloses the preparation & use of DCFO as a safe, castable explosive for use in shaped explosives such as shaped charges & EFPs.
Detonation occurs via a blasting cap. |
Please attach that patent here as a PDF. I cannot find it on www.patentstorm.us or www.freepatentsonline.com .
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Rosco Bodine
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Google Patents is the best free service for US patents
http://www.google.com/patents?id=PT48AAAAEBAJ&dq=patent:...
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Sauron
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I had no trouble at all retrieving it yesterday at freepatentsonline.com.
[Edited on 24-7-2008 by Sauron]
Attachment: US3832249.pdf (66kB)
This file has been downloaded 688 times
Sic gorgeamus a los subjectatus nunc.
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The_Davster
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The ref Axt did not have access to.
Attachment: cyanofurazan.pdf (81kB)
This file has been downloaded 1284 times
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