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The '''mesomeric effect''' or '''resonance effect''' in [[chemistry]] is a property of [[substituent]]s or [[functional group]]s in a [[chemical compound]]. The effect is used in a qualitative way and describes the electron withdrawing or releasing properties of substituents based on relevant [[resonance structure]]s and is symbolized by the letter '''M'''. The mesomeric effect is negative ('''-M''') when the substituent is an electron-withdrawing group and the effect is positive ('''+M''') when based on resonance the substituent is an electron releasing group.
===[[Addison School]]===
Three-sentence, two-line substub on an elementary school. '''Delete'''. [[User:Neutrality|Neutrality]]<sup>[[User talk:Neutrality|talk]]</sup> 19:58, May 15, 2005 (UTC)
*Examples of -M substituents: [[acetyl]] (UPAC ethanoyl) - [[nitrile]] - [[nitro]]
*'''Delete'''; although I'm no longer a delete-school-articles person, I am still a delete-small-useless-articles person. [[User:Linuxbeak|Linuxbeak]] | [[User:Linuxbeak/Desk|Desk]] 20:26, May 15, 2005 (UTC)
*Examples of +M substituents: [[alcohol]] - [[amine]]
*'''Delete''' and merge info to [[Palo Alto, California]]. Article does not refute non-notability. [[User:Gazpacho|Gazpacho]] 20:29, 15 May 2005 (UTC)
*'''Keep'''. Verifiable and NPOV. [[User:DoubleBlue|<font color="darkblue">'''Double'''</font><font color="blue">Blue</font>]] ([[User talk:DoubleBlue|Talk)]] 20:59, 15 May 2005 (UTC)
The net electron flow from or to the substituent is determined also by the [[inductive effect]]. It's important to note that the mesomeric effect as a result of p - orbital overlap (resonance) has absolutely no effect on this inductive effect, as the inductive effect is purely to do with the [[electronegativity]] of the atoms and their structural chemistry (which atoms are connected to which).
*'''Delete'''. Notability not established. [[User:ESkog|ESkog]] 22:16, 15 May 2005 (UTC)
*'''Keep''' -- [[User:Longhair|Longhair]] | [[User talk:Longhair|Talk]] 22:21, 15 May 2005 (UTC)
The concepts of mesomeric effect, '''mesomerism''' and '''mesomer''' were introduced by [[Christopher Kelk Ingold|Ingold]] in 1938 as an alternative to the [[Linus Pauling|Pauling's]] synonymous concept of [[resonance effect|resonance]] <ref>''If It's Resonance, What Is Resonating?'' Kerber, Robert C. . J. Chem. Educ. '''2006''' 83 223. [http://www.jce.divched.org/Journal/Issues/2006/Feb/abs223.html Abstract]</ref>. Mesomerism is in this context is often encountered in German and French literature but in English literature the term resonance dominates.
*'''Delete'''. Non-notable. [[User:Quale|Quale]] 22:39, 15 May 2005 (UTC)
*'''Keep'''. Verifiable, NPOV, reasonable topic. [[User:Kelly Martin|Kelly Martin]] 22:50, May 15, 2005 (UTC)
== External links==
*'''Merge and redirect''' to [[Palo Alto, California]] (unless significantly expanded by end of VfD, of course). [[User:JYolkowski|JYolkowski]] // [[User talk:JYolkowski|talk]] 22:54, 15 May 2005 (UTC)
* IUPAC [[Gold Book]] [http://www.iupac.org/goldbook/M03844.pdf definition]
*'''Keep'''. As noted by others above fits the [[Wikipedia_talk:Fame_and_importance#No|criteria put up by Jimbo Wales]] for keeping an article on Wikipedia: verifiable & NPOV --[[User:AYArktos|AYArktos]] 00:38, 16 May 2005 (UTC)
*'''Comment'''. I have expanded the article to show what a little work can do to even an ordinary ''elementary'' school. I have no ties to the school and have never even been to California. Just collected info from the internet. Plenty more info could be obtained by others. Schools '''are''' encyclopedic. [[User:DoubleBlue|<font color="darkblue">'''Double'''</font><font color="blue">Blue</font>]] ([[User talk:DoubleBlue|Talk)]] 02:45, 16 May 2005 (UTC)
== See also ==
*'''Keep''' schools. --[[User:Unfocused|Unfocused]] 03:41, 16 May 2005 (UTC)
* [[List of publications in chemistry#Organic chemistry|Important publications in organic chemistry]]
*'''Keep'''. Three cheers for [[User:DoubleBlue|DoubleBlue]] for an excellent demonstration, by expanding the stub, of why school stubs should be permitted to grow organically. --[[User:Tony Sidaway|Tony Sidaway]]|[[User talk:Tony Sidaway|Talk]] 06:05, 16 May 2005 (UTC)
*'''Delete.''' Useless collection of generic facts about an insignificant school. This is not an encyclopedia article. Individual schools are not inherently encyclopedic and there is nothing to distinguish insignificant schools like this one from thousands of nearly identical schools around the world. [[User:Gamaliel|Gamaliel]] 07:08, 16 May 2005 (UTC)
== References ==
*'''Keep''' Thank you for the excellent rewrite DoubleBlue. [[User:Pcb21|Pcb21|]] [[User_talk:Pcb21|Pete]] 07:24, 16 May 2005 (UTC)
<references />
*'''Keep''', excellent rewrite, now an asset to wikipedia. Thank you DoubleBlue. [[User:Kappa|Kappa]] 08:35, 16 May 2005 (UTC)
*'''Merge''' into [[Palo Alto, California]] and '''delete''' - [[User:Skysmith|Skysmith]] 09:02, 16 May 2005 (UTC)
[[Category:Chemical bonding]]
*'''Keep''', verifiable & NPOV, looks fine to me. -- [[User:Lochaber|Lochaber]] 12:24, 16 May 2005 (UTC)
*'''Condense and Merge''' with [[Palo Alto, California]]. Article contains a lot of trivia. --[[User:Carnildo|Carnildo]] 17:55, 16 May 2005 (UTC)
[[de:Mesomerer Effekt]]
*'''Keep''' Please stop wasting our time. [[User:Oliver Chettle|Oliver Chettle]] 19:19, 16 May 2005 (UTC)
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