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Author: Subject: How to or where to get alkenes
Gooferking Science
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[*] posted on 21-9-2013 at 13:35
How to or where to get alkenes


Hello! I am trying to get an alkene molecule. I want it to demonstrate how alkenes can be detected by adding bromine water. Is there a way to make an alkene or buy it locally? I will use the internet as a last resort.



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sonogashira
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[*] posted on 21-9-2013 at 14:29


Animal fats, vegetable oils, turpentine, limonene, most essence oils etc.

[Edited on 21-9-2013 by sonogashira]
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Rich_Insane
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[*] posted on 21-9-2013 at 17:12


d-Limonene is pretty common.
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Cornaboeaux
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[*] posted on 21-9-2013 at 21:57


I remember a fact from high school books: Bananas and apples and other similar fruits produce ethene when they ripen. The ethene also quickens the ripening process itself so if you put a banana in a sealed bag it will ripen more quickly than in open air. Maybe you could collect the gas somehow?
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[*] posted on 22-9-2013 at 00:22


Ethanol mixed in a test tube with conentrated sulphuric acid with strong heating yealds ethene gas, simlest of the alkanes. Putting some sand in there helps the reaction IIRC
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Eddygp
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[*] posted on 22-9-2013 at 00:40


Quote: Originally posted by Cornaboeaux  
I remember a fact from high school books: Bananas and apples and other similar fruits produce ethene when they ripen. The ethene also quickens the ripening process itself so if you put a banana in a sealed bag it will ripen more quickly than in open air. Maybe you could collect the gas somehow?


IIRC, the amounts are quite negligible, but a batch of fruit inside a bag might be a good idea.




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DJF90
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[*] posted on 22-9-2013 at 00:43


Easiest source of alkenes is steam distillation of orange peel to get d-limonene (a diterpene). The set-up need not be fancy; when I was back at school we took some orange peel in a flask, added water, and distilled. The alkene appears as a light oil floating on the surface of the aqueous distillate. We also used this material to demonstrate the reaction you described, along with several others
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[*] posted on 22-9-2013 at 06:46


Trichloroethylene is a solvent available in some areas. About 8 years ago I purchased some from the local hardware store in an attempt to make carbon tetrachloride by photochlorination.



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22-9-2013 at 07:21
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[*] posted on 22-9-2013 at 11:45


Some grocery stores, in the pharmaceutical section, will carry turpentine, which is mainly made up of pinene.



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papaya
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[*] posted on 22-9-2013 at 12:48


https://en.wikipedia.org/wiki/Carotene
In fact many of colored organic substances are (poly)unsaturated..
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