Talk:Ester

message: In the Nomenclature section, under inorganic esters, there are 2 intern links to the same article I guess (borinic esters and boronic esters), but one is wrong typed... OR it must be another unexisting article, I don't know. I don't understand how to fix that problem. Thanks for your help Tithee.lefebvre (talk) 09:43, 31 May 2020 (UTC)
replies: text: A bit late, but these are different compounds. Boronic esters have one oxygen directly attached to the boron; whereas as boronic esters have two. Compare Borinic acid and Boronic acid 84.92.40.23 (talk) 20:42, 17 May 2022 (UTC)
thread_title:  Typo? Bor'''o'''nic vs  bor'''i'''nic ester 

message: I'm not sure, but i guess 'Esters are more polar than ethers but less polar than alcohols' should be replaced by 'Esters are more polar than acids but less polar than alcohols' ?  — Preceding unsigned comment added by 121.1.55.84 (talk) 00:57, 2 October 2013 (UTC)
replies: text: It is correct as written. RomanHunt (talk) 06:36, 29 June 2014 (UTC)
thread_title:  Typo ? ether/acid 

message: Do we indeed really need to mention a whole list of esters? The chemistry section is much more important. There are not even mechanisms in there that explain the acid cat. ester formation! Sikkema 12:30, 20 July 2007 (UTC)
thread_title:  Listing 

message: I started researching the net to verify that methyl butanoate and ethyl butanoate both have a pineapple smell.  Here is what I found up this time:
* says that both methyl butanoate and ethyl butanoate smell of pineapple.
* lists ethyl butanoate under pineapple.
* says that ethyl butanoate is pineapple [flavor].
*Wikipedia article on Aroma compound says that methyl butanoate smells of pineapple or apple and that ethyl butanoate smells of pineapple.  The individual articles on these esters also states this.
*  says that methyl butanoate is apple [flavor] and ethyl butanoate is pineapple [flavor].
*  says that methyl butanoate smells of pineapple.
Based on these findings and for consistency with the rest of Wikipedia, I edited the list under the Physicals section of the Ester article to state the methyl butanoate smells of pineapple or apple and ethyl butanoate smells of pineapple.  It's certainly possible for very similar compounds to have similar smells.  A pineapple does not necessarily have to be flavored with only a single compound.  H Padleckas 16:37, 17 July 2005 (UTC)
thread_title:  Methyl butanoate and Ethyl butanoate 

message: If anyone has the rules handy (I don't right now), a description of the IUPAC method for naming esters would be handy. 24.118.220.84 06:36, 5 May 2004 (UTC)
replies: text: Agreed. Not to mention the inclusion of naming esters as substituents.134.250.70.81 02:45, 22 February 2007 (UTC)
thread_title:  Nomenclature 

message: :: 69.140.164.142 13:12, 6 April 2007 (UTC)
replies: text: If you connect a fatty acid (which is a carboxylic acid) to glycerol (which is an alcohol), the linkage is an ester.  Thus, the produce is a "fatty acid ester of glycerol".  Diacylglycerol would be an example.  -- Scray (talk) 03:34, 19 May 2013 (UTC)
thread_title:  Intro Too Technical 

message: It looks like someone moved it back. The term "fatty acid esters of glycerol" does not tell me how fatty acids relate to glycerol - they are totally different, glycerol has a higher oxygen ratio and is shorter, for example. will have to look elsewhere. Triglyceride seems to provide a little more information Charlieb000 (talk) 02:54, 19 May 2013 (UTC)
replies: text: If you connect a fatty acid (which is a carboxylic acid) to glycerol (which is an alcohol), the linkage is an ester.  Thus, the produce is a "fatty acid ester of glycerol".  Diacylglycerol would be an example.  -- Scray (talk) 03:34, 19 May 2013 (UTC)
thread_title:  Fatty acids and glycerol 

message: I started cleaning up the big table. In particular, I made it sortable and added images and molar masses. It would be interesting to also have the NFPA 704 health, flammability, and reactivity numbers as their own (sortable) column. —Ben FrantzDale 22:13, 13 May 2007 (UTC)
thread_title:  Table 

message: Red/blue/yellow diamond shapes do not display properly in all browsers. They could be replaced with a similar symbol from under the edit box, but the size would have to be specified as well. For example:
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♦
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Svemir 14:28, 16 May 2007 (UTC)
thread_title:  Diamonds do not show in all browsers 

message: This article is too vague for those with little chemistry knowledge.  The introduction doesn't explicitly explain what an ester is in terms of what atom connects to what.  The introduction is poorly written--it merely lists the types of esters out there.  Too much details but no actual description of what an ester is specifically.  (Compare this article to the Carbonyl article.  The other article's first sentence concretely tells about the atom-atom connections: "In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom : C=O.199.76.186.8 03:55, 8 September 2007 (UTC)
replies: text:  Better? Cacycle 04:54, 8 September 2007 (UTC)
thread_title:  Very vague intro 

message: This is just to say thankyou to those who edit and make sure this and related articles are acurate and easy to understand, as I'm sure you realise many students such as myslef go to chemistry articles like this to learn. Thank you.  —Preceding unsigned comment added by 217.35.93.92 (talk) 19:39, 19 March 2008 (UTC)
thread_title:  Thank you! 

message: According to Twenty First Century Science GCSE Chemistry (ISBN: 978-0-19-915050-2), pineapple contains 120mg/kg of ethyl ethanoate (or ethyl acetate as in this article). Should pineapple be included in the table of odours for ethyl acetate? Leonini (talk) 11:55, 22 May 2008 (UTC)
thread_title: Odours

message: I must say that I don't remember too much from my college chem courses, but do alot of acids have OH groups?  I thought that's what made a base.  Smack me if I'm wrong. Alex T 69.122.62.231 (talk) 02:28, 29 May 2008 (UTC)
replies: text: This is not the place for an essay on the definitions of acids and bases, but the following summary might help. Basic school chemistry usually defines acids as compounds that can donate H+ ions, and bases as compounds that can accept H+ ions (the Brønsted-Lowry theory). One of the common classes of bases (the alkalis) do indeed include the -OH (hydroxyl) group (a standard example being sodium hydroxide - NaOH). However, many acids also contain -OH groups: sulphuric acid (H2SO4) has the structure HO-(SO2)-OH, with two -OH groups, and phosphoric acid (H3PO4) has three -OH groups. The key difference is how they ionise (typically in aqueous solution): a base B-OH will typicall ionise to B+ + OH-, while an acid A-OH will ionise to A-O- + H+. I hope this helps! (and yes, that is how we spell "ionise" in the UK). FredV (talk) 11:30, 7 January 2009 (UTC)
thread_title:  Replacing the OH with an O in an acid. 

message: What is a half ester? If this is the place to explain, someone please go ahead.
Thanks, ... PeterEasthope (talk) 22:13, 17 November 2008 (UTC)
replies: text: I am not an expert, but I believe this rather confusing term is used to describe derivatives of dicarboxylic acids (i.e. R(CO2H)2) in which only one of the acid groups is esterified (i.e. R(CO2H)CO2R')FredV (talk) 12:10, 13 January 2009 (UTC)
thread_title:  Half ester 

message: I am revising the article following the outline in the Chem manual of style.  Large chunks will be moved around.  This particular piece seems out of place somehow, sort of a game on who can name high-order oligoesters. For an overview, these species seem to be rather specializes, but I did not want to unilaterally discard this info.  I retained (and will expand) the triester bit, since the triglycerides are so broadly important.--Smokefoot (talk) 05:39, 27 August 2009 (UTC)
thread_title: Oligoesters

message: I think that this merge should be noncontroversial.  Under the manual of style for functional groups, the article ester is required to have a section on their preparation.  The main method for their preparation is esterification, so it seems that this as a separate article should be blended with this one.  Ideas welcome.--Smokefoot (talk) 03:17, 7 November 2010 (UTC)
thread_title: Merge proposal

message: The Table in Appendix A that provides a list of Ethers has one column labeled "Odor or occurrence" which makes the listing of substances ambiguous as to whether the ether smells like the substance or is found as a component of the substance. Alchemy Heels I (talk) 18:50, 24 November 2010 (UTC)
thread_title:  Appendix A: Ambiguity 

message: Thanks for the great article. I was however looking for a toxicity topic and did not see it (did I miss it?). Specifically with regards to alcoholic beverages, someone once told me that a reason for maturing spirits using oak wood is because undesirable (toxic?) esters will either evaporate through the oak microscopic pores or complete their chemical transformation into alcohol over the maturation period. Is this true?  — Preceding unsigned comment added by Robertoff (talk • contribs) 02:34, 21 July 2012 (UTC)
thread_title:  Toxicity 

message: In this edit a contradiction is claimed by , i.e. "," but I don't see it. I am not an expert so I may have misunderstood - please explain. The first sentence (referenced in the claim) does not refer to a carboxylic acid at all; rather, it refers to a carbonyl group, which does not assume that the carbonyl came from a carboxylic acid (i.e. it could come from an oxoacid, which is what the next two sentences specify).  -- Scray (talk) 20:39, 11 December 2013 (UTC)
replies: text: The first sentence refers to a carbonyl (C=O) neighbouring an ether (–O–), which together would make up a carboxylic acid group. Other oxoacids (such as sulfuric acid) don't have a carbonyl. The Gold Book (Ref 1) first talks about carboxylate esters, and then mentions other esters "by extension", whatever that means. --ἀνυπόδητος (talk) 12:58, 12 December 2013 (UTC)
thread_title:  Putative contradiction 

message: Just a request - I think the article, especially the preparation section, needs more structures instead of inline molecular formulas. It would increase the readability a lot. OxygenBlue (talk) 21:55, 16 December 2013 (UTC)
thread_title:  Structures needed 

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thread_title:  External links modified 

message: Please help with physical science am in grade 11  — Preceding unsigned comment added by 197.254.161.145 (talk) 06:59, 6 September 2022 (UTC)
thread_title:  Physical science