Talk:Alkene

From Wikipedia, the free encyclopedia

WikiProject Chemistry
Chemistry Portal
This article is within the scope of WikiProject Chemistry, which collaborates on Chemistry and related subjects on Wikipedia. To participate, help improve this article or visit the project page for details on the project.
B This article has been rated as B-Class on the quality scale.
High This article has been rated as high-importance on the importance scale.

Article Grading: The article has been rated for quality and/or importance but has no comments yet. If appropriate, please review the article and then leave comments here to identify the strengths and weaknesses of the article and what work it will need.

One significant test to differentiate between the 3 classes of Hydrocarbons(Alkanes,Alkenes,Alkynes)is the use of Bromine Water.Suppose an alkene is added to a solution containing chlorine,no reaction occurs.But the minute Bromine is added to the solution,It starts to change colour.Alkynes also decolorize bromine water.

Is "recombinaison" an English word? Wmahan 21:58, 2004 Apr 4 (UTC)

Contents

[edit] lewisite gas

[edit] If an alcohol is named R-OH (or ROH) (at least for 1°) and an aldehyde R-CHO, what is an alkene named?

Just out of curiousity. -x42bn6 Talk 10:31, 4 September 2005 (UTC)

All alkenes have the general formula CnH2n. You wouldn't express it the way you're suggesting, but R=R' would probably suffice.

[edit] =============================================

"Alkenes can be synthesized from alcohols via an elimination reaction that removes one water molecule: H3C-CH2-OH + H2SO4 → H3C-CH2-O-SO3H + H2O → H2C=CH2 + H2SO4"

I've never seen that intermediate before: "H3C-CH2-O-SO3H". You can do that with sulfoxide groups, though:

E.g. R-OH + CH3SO2Cl ---> R-O-SO2-CH3

I find it hard to believe that the species mentioned there is stable.

Strictly speaking, this is not an "Elimination". It's mechanism is not E2 or E1. It's actually a dehydration. Should this be changed? Ironically, the reaction described here requires heat and is quite brutal; Most organic chemists would not employ it for fear of side reactions.

[edit] Olefin

Does anyone know the amount of olefin distributed each year nationally and worldwide?

[edit] Mechanism of Halogenation

Just letting you know that the mechanism shown for halogenation is a bit wrong, the intermediate is a bromonium ion rather than the true carbocation that is shown. The ion is then attacked by bromide to form the dibromide with ANTI stereochemistry exclusively.


-Yeah, can someone please change that, it's misleading.

[edit] Removed Gayvene

I removed the reference to Gayvene, the supposed 69th alkene. I'm not an organic chemist, but I'm pretty sure that was vandalism. If gayvene is really some new breakthrough compound that has recently been discovered, feel free to add it back to the article but please provide a reference. (Note the common reference "my ass" in not acceptible in this case.)

[edit] Non IUPAC Nomenclature

Per 1993 IUPAC Recommendations, the locant for the ene should be located in front of -ene. For example, hex-2-ene, formerly 2-hexene. Please if you are posting here, use correct IUPAC nomenclature.Hokietiki@hotmail.com 14:30, 1 February 2007 (UTC)

[edit] merge Carbon-carbon double bond into alkene

The topic Carbon-carbon double bond is identical to the topic alkene. It is also vandalized, also contains a dead image link. Propose speedy merge V8rik 21:24, 14 March 2007 (UTC)

  • Done V8rik 21:41, 12 April 2007 (UTC)

[edit] You shouldnt call it ethylene...it's ethene.

...come on you know it makes sense —The preceding unsigned comment was added by 86.42.173.247 (talk) 19:26, 1 April 2007 (UTC).

[edit] alternative to E and Z notation

isn't a common alternative the usage of cis- and trans- for entgagen and zussamen, respectively? surely that's worth including. User:Namangwari 4 June 2007

For better, for worse, Isomers of butylene uses that notation under the "IUPAC" column. Is it a deprecated usage or still used? -- atropos235 ✄ (blah blah, my past) 05:07, 7 August 2007 (UTC)
I've added a quickie Cis-Trans section, and provided links to the main articles JeramieHicks (talk) 18:57, 20 November 2007 (UTC)

[edit] prefix / infix numbers

Perhaps it's worth being consistent by using either infix numbering ("but-1-ene") or prefix numbering ("1-butene") throughout? -- 119.11.7.177 (talk) 02:11, 3 January 2008 (UTC)

Good point. I'm revising this article at the moment (in case you couldn't tell!) so I'll specifically check that. Thanks, Walkerma (talk) 07:02, 4 January 2008 (UTC)

[edit] Same style of first paragraph as "alkane" page?

I was wondering...to compare to alkanes, should the first paragraph be similar in style to that of the alkane page? Possibly me being pedantic, but I think that they should be similar - they relate to each other as hydrocarbons. Although the content is there later on in the article, I think that the first paragraphs from both articles should be succinct in giving a general idea of them! I know I should be bold and do it straight away, but I just want at least another person in agreement! --Itsalive4 (talk) 19:57, 1 June 2008 (UTC)