Talk:Appel reaction

I do not quite see the double displacement reaction in this reaction but I would expect reference to SN2 reaction with Walden inversion am I missing a point? rikXL 22:40, 16 Jun 2005 (UTC)

Going from 4 to 6/7 you do indeed do a double displacement of sorts- you react RCH2-O⁻ with +P-Cl and get +P-O⁻ and RCH2-Cl (the O⁻ and Cl have swapped places). The P=O resonance form is shown so it's perhaps less obvious. However the second step of that sequence, 5 going to 6/7 is indeed just an SN2 reaction, perhaps worth mentioning. Does the reaction work with secondary alcohols too (so you could see Walden inversion easily)? If so, that would be worth commenting on in the article, as only primary alkyl is shown in the scheme. Also, I should mention that I think the ratio of font size to bond length in the basic reaction scheme looks unsightly- I think the atom labels should be much smaller. The mechanism by contrast is beautifully done. Walkerma 04:58, 19 Jun 2005 (UTC)

I added some text to clarify the "double displacement" statement I made. It should be more clear now. Yes, the reaction works with secondary alcohols, and a SN2 and Walden inversion do take place with them. Ironically, the same ChemDraw settings were used for the top image as the mechanism image. I agree a little bit about the unsightliness of the top image, so I made it slightly smaller. It looks a little better. If it really bugs me, I'll draw a new one. (Feel free to substitute it with one of your own if it really bugs you.) ~K 18:04, 19 Jun 2005 (UTC)

1. 1. 1. 1. Duing the displacement reaction of halide ion by PPh3(first step of mechanism), the attack of lone pair of PPh3 on hlide how is possible? Because the electronegativity of carbon is 2.5 whereas 2.96 for bromide. That means carbon is more electrophile compare to bromine. I can not understand that point. anyone can explain that point plz...............sumanta(sum_bbn@yahoo.co.in) —Preceding unsigned comment added by 59.163.216.16 (talk) 17:56, 14 July 2009 (UTC)

Chemical schemes a bit fuzzy?

Hi, would anyone mind if I redraw the reaction schemes in this article? To me they look a bit fuzzy. I've redrawn the first scheme already, but haven't changed it in the article. Hopefully you can see the difference below.

Appel reaction scheme drawn with ChemBioDraw Ultra, Version 13.0.2.3021. ACS settings applied. SVG format {{PD-chem}}

I'll follow the Wikipedia manual of style, which should also mean the schemes have a consistent style. WP:Structure drawing manual of style

Please let me know if you have any comments. Marvinthfish 10:31, 8 October 2014 (sorry, forgot the tildas! Edit 09/10/2014)

Some comments, not that I feel very strongly. I do not like drawings of R-OH to R-Cl because I dont see the point of drawing something that can be so readily typed. Thus, my preference would be that this conversion be handled with a balanced line equation.--Smokefoot (talk) 17:22, 8 October 2014 (UTC)

Thanks. I hadn't thought about simply typing it out. That should make the information clearer as well. Marvinthefish (talk) 12:38, 9 October 2014 (UTC)

External links modified

Hello fellow Wikipedians,

I have just modified one external link on Appel reaction. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20120722130658/http://www.alfa.com/en/docs/OrganoIntermediates.pdf to http://www.alfa.com/en/docs/OrganoIntermediates.pdf

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 14:31, 16 October 2016 (UTC)