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Author: Subject: Butane (C4H10) experiments...
kazaa81
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cool.gif posted on 19-2-2005 at 14:17
Butane (C4H10) experiments...


Hallo to all,

recently, I've bought some equipment which make me able to work with presserised gases stored in bottles like butane refillers.

Can anyone told me any experiment which can be conducted with butane (C4H10)?
I'm watching camphor which melts in liquid n-butane at some celsius degrees below zero...that's fun! ;)

Ok, thanks at all for help!
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kazaa81
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[*] posted on 19-2-2005 at 16:20
.


Hi,
now I'm going to sleep, good night to everyone!
PLEASE post ANY idea, ex. synthesis of butane omologues (inferior and superior) from it, just to give an idea....post everything (interesting) in which butane can be used.
Please maintain "live" this section of forum with our ideas!

Have fun with butane! ;) ;)
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neutrino
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[*] posted on 19-2-2005 at 17:31


You could always use it for extraction of things from plant matter. I’m pretty sure that capsaicin (the chemical that makes things spicy) is soluble in butane.
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Skinflint
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[*] posted on 20-2-2005 at 00:29


It would be fun to brominate it with liquid bromine, but this would probably be quite energetic and difficult to do. You could then try to seperate the less volatile products.
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BromicAcid
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[*] posted on 20-2-2005 at 00:48


Bromination of butane at 127 C and in the presence of UV light favorably leads to 2-bromobutane (98.2%) and the remainder is regular bromobutane. I'm sure in excess you could force it to go further, but its not really that reactive expecially if you compare it to chlorine.



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Esplosivo
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[*] posted on 20-2-2005 at 05:57


BromicAcid, or anybody, do you known what position is favoured on reaction of chlorine and butane? A doubt a mono-substitution can be achieved with the vigorous chlorine but a mixture of halogenoalkanes would be quite useful as a solvent. The prep is quite easy, as a source of UV I've got the sun and for the Cl2 I've always used he rxn between KMnO4 and HCl. Thanks for the help.



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sparkgap
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[*] posted on 20-2-2005 at 06:03


The secondary positions (i.e., the two carbons in between) are preferentially attacked. The radicals corresponding to those positions are stabilized by the surrounding groups.

In short, your resulting mixture of chlorinated butanes will most probably have most of them chlorinated at carbons 2 and 3.

Hope this helps.

sparky (^_^)




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kazaa81
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biggrin.gif posted on 20-2-2005 at 09:30
Many thanks!


Hi,

many thanks to everyone who have helped me!

You have talked about butane reacting with chlorine, this reaction seem feasible for me, even because I've finished to build my homemade "kipp" equipment.

It is a airtight flask connected with a 3 exit link: one inserts in the flask's gum cap, one is used to insert the reagent in the flask (the one which starts reaction) and one is linked to a small plastic tube attached to a bubbler.

Can anyone explain more deeply how works the reaction?

Please add more, even how butane reacts with other compounds.

Thanks at all for help!! ;) ;)
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BromicAcid
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[*] posted on 20-2-2005 at 10:07


Photochemical chlorination of n-butane:

CH3CHClCH2CH3 (75%) @ 30C
CH3CH2CH2CH2Cl (25%) @ 30C

Works best with blue light or shorter wavelengths, inital step is rupture of the Cl-Cl bond and free radical attack. As you can see compared to the yields above with bromine, bromine is much more selective about attacking butane then chlorine is. Separation of these two compounds would probably prove very difficult though along with keeping the chlorine to butane ratio nice and even.




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kazaa81
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[*] posted on 22-2-2005 at 12:03
thanks..


Hi,
I haven't much time to spend in the net,
so add more, please.
ANY info. is welLcomed!

Thanks at all for infos! ;)
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