Gooferking Science
Hazard to Self
Posts: 97
Registered: 17-7-2013
Location: Somewhere in Kansas, USA...
Member Is Offline
Mood: Halogenated
|
|
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.
|
|
|
sonogashira
National Hazard
Posts: 555
Registered: 10-9-2006
Member Is Offline
Mood: No Mood
|
|
Animal fats, vegetable oils, turpentine, limonene, most essence oils etc.
[Edited on 21-9-2013 by sonogashira]
|
|
|
Rich_Insane
Hazard to Others
Posts: 371
Registered: 24-4-2009
Location: Portland, Oregon
Member Is Offline
Mood: alive
|
|
d-Limonene is pretty common.
|
|
|
Cornaboeaux
Harmless
Posts: 3
Registered: 21-9-2013
Member Is Offline
Mood: No Mood
|
|
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?
|
|
|
Oopsy_daisy
Harmless
Posts: 15
Registered: 24-6-2013
Location: Sweden
Member Is Offline
Mood: No Mood
|
|
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
|
|
|
Eddygp
National Hazard
Posts: 858
Registered: 31-3-2012
Location: University of York, UK
Member Is Offline
Mood: Organometallic
|
|
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.
there may be bugs in gfind
[ˌɛdidʒiˈpiː] IPA pronunciation for my Username |
|
|
DJF90
International Hazard
Posts: 2266
Registered: 15-12-2007
Location: At the bench
Member Is Offline
Mood: No Mood
|
|
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
|
|
|
BromicAcid
International Hazard
Posts: 3227
Registered: 13-7-2003
Location: Wisconsin
Member Is Offline
Mood: Rock n' Roll
|
|
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.
|
|
|
bfesser
|
Thread Moved
22-9-2013 at 07:21 |
subsecret
Hazard to Others
Posts: 424
Registered: 8-6-2013
Location: NW SC, USA
Member Is Offline
Mood: Human Sadness - Julian Casablancas & the Voidz
|
|
Some grocery stores, in the pharmaceutical section, will carry turpentine, which is mainly made up of pinene.
Fear is what you get when caution wasn't enough.
|
|
|
papaya
National Hazard
Posts: 615
Registered: 4-4-2013
Member Is Offline
Mood: reactive
|
|
https://en.wikipedia.org/wiki/Carotene
In fact many of colored organic substances are (poly)unsaturated..
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
