Talk:Ester

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Contents 1 Listing 2 Chemical properties 3 move ester compound back? 4 Methyl butanoate and Ethyl butanoate 5 Ester who? 5.1 ======================================= 5.2 ============================================ 6 Nomenclature 7 Table 8 Diamonds do not show in all browsers 9 Very vague intro 10 Thank you! 11 Odours 12 Replacing the OH with an O in an acid.

[edit] Listing

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)

I think the ester_compound page should be moved back here. The other pages are not as important as the chemistry one, except for the ester, alaska one but a note at the top of the page would suffice for that. Ester final fantasy is trivial and esther i the bible is not even the same spelling. Its not called an ester compound anyway, if anything it should just be ester (chemistry). Borb 08:28, 6 May 2005 (UTC)

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It might do to describe which isomer of the pentyl radicals are refered to in some of the esters given.

• Given that one-carbon differences in chain length lead to distinguishable

odors, and that different optical isomers of odorants/flavorants (eg, carvone) lead to distinguishable odors, I would be *very* surprised if there were not also a dependency on pentyl chain isomerism.

Could anyone explain how the term mono-ester and di-ester is used?

• This page needs a bit on mono, di and poly esters (I linked it to polyester page already, but thats also not very good). Basically a monoester is just an ester (one ester) a di-ester is two esters bonded together (the same way as polyesters).

[edit] Chemical properties

I was frustrated by the lack of information on the chemical properties of esters. Are the reactions listed the only ones that it usually goes through? Could someone please post more information?

The reaction(s) listed are not the only ones esters can undergo. A discussion of all the reactions esters can be involved in can fill up an entire chapter of an organic chemistry book. It's not practical to list them all in a general encyclopedia. Some day, when I have time, I might do some work on this esters article. H Padleckas 09:19, 10 Dec 2004 (UTC)

Some of the previous few edits, including mine, have improved this article - especially the definition of ester (needed to encompass inorganic acid esters), but some day I would like to do still more to improve this article. H Padleckas 08:47, 14 July 2005 (UTC)

I'll get some info up in the future.

The methyl acetate link points to the article, but the article says that the compound has an odor of glue, which conflicts with the table, where it is listed as having the odor of peppermint. Anybody know which needs fixed?

Methyl acetate smells of modelling glue, MENTHYL Acetate smells of peppermint! —Preceding unsigned comment added by Strontiumred (talk • contribs) 14:30, 16 October 2007 (UTC)

[edit] move ester compound back?

yes, the ester content did move to ester compound because other ester (esther) definitions started to pop up. feel free though to revert this edit back to the original but please consider a solution for the other definitions.

[edit] Methyl butanoate and Ethyl butanoate

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:

• [1] says that both methyl butanoate and ethyl butanoate smell of pineapple.

• [2] lists ethyl butanoate under pineapple.

• [3] 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.

• [4] says that methyl butanoate is apple [flavor] and ethyl butanoate is pineapple [flavor].

• [5] 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)

[edit] Ester who?

Can anyone add the explanation or story behind the name? I'm not sure, maybe I'm mixing with another compound name, but I've heard about some compound named after the lover of the chemist who've discovered it. Is this the same compound?—Preceding unsigned comment added by Cow2001 (talk • contribs)

It might be easier if you had links that actually showed the structure.—Preceding unsigned comment added by 65.27.132.105 (talk)

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

"Esters are a class of chemical compounds and functional groups."

This definition is unsat. Needs to distinguish esters from other chem compounds and functional groups.

Norm

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

[edit] Nomenclature

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)

Agreed. Not to mention the inclusion of naming esters as substituents.134.250.70.81 02:45, 22 February 2007 (UTC)

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This article may be too technical for a general audience. Please help improve this article by providing more context and better explanations of technical details to make it more accessible, without removing technical details.

69.140.164.142 13:12, 6 April 2007 (UTC)

[edit] Table

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)

[edit] Diamonds do not show in all browsers

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:

♦ ♦ ♦

Svemir 14:28, 16 May 2007 (UTC)

[edit] Very vague intro

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)

Better? Cacycle 04:54, 8 September 2007 (UTC)

[edit] Thank you!

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)

[edit] Odours

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)

[edit] Replacing the OH with an O in an acid.

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)