|Aldehyde has been listed as a level-4 vital article in Science. If you can improve it, please do. This article has been rated as B-Class.|
|WikiProject Chemistry||(Rated B-class, High-importance)|
The pKa of an α hydrogen is 20.
NOTE: Where did that pKa come from? Is it aliphatic or aromatic, as benzaldehyde would stand to have a lower pKa (as it is more acidic that the aliphatic version).
- Benzaldehyde has no alpha proton, so it is not acidic, do you mean phenylacetaldehyde? I don't have the source of this value to hand, but I do have a reference for 3-pentanone as pKa 19-20 in water. See here I suspect that the higher figure you have seen is in DMSO, where pKa values are usually higher than in water. Walkerma 21:01, 20 September 2005 (UTC)
how does an organism metabolize an aldehyde?
in the wikipedia article on the "IUPAC nomenclature of organic chemistry" it is stated that (quote): " If a prefix form is required, "oxo-" is used (as for ketones), with the position number indicating the end of a chain: CHOCH2COOH is 3-oxopropanoic acid. If the carbon in the carbonyl group cannot be included in the attached chain (for instance in the case of cyclic aldehydes), the prefix "formyl-" or the suffix "-carbaldehyde" is used: C6H11CHO is cyclohexanecarbaldehyde. "
This article doesn't mention the prefix "oxo-" at all. Instead only: " If another functional group is present which IUPAC rules prescribe must be named as a suffix, the aldehyde group is named with the prefix formyl-. This prefix is preferred to methanoyl-. "
This would imply that either this article on aldehydes misses out important information, or that the above quoted article on IUPAC nomenclature is misleading.
acyl vs aldehyde
Are they exactly the same thing?184.108.40.206 15:12, 22 September 2007 (UTC)
- No, they are different - rather like the difference between alkyl and alkane. So you could talk about the acyl group in acetic acid, meaning the CH3C(=O)- group, commonly called the acetyl group. Walkerma 15:38, 22 September 2007 (UTC)
What is a semialdehyde?
- A simple internet search reveals that it is the monoaldehyde of a dicarboxylic acid. --220.127.116.11 (talk) 05:20, 27 June 2013 (UTC)
The Aldol Condensation and Canizzaro reactions need more coverage here since they are important reactions concerning Aldehydes. Could someone please pick excerpts and put them here? 02:09, 8 April 2010 (UTC)Darshit —Preceding unsigned comment added by Darnir redhat (talk • contribs)
I propose that Dialdehyde be merged into Aldehyde. I think that the content in the dialdehyde article can easily be explained in the context of aldehyde, and the aldehyde article is of a reasonable size in which the merging of dialdehyde will not cause any problems as far as article size or undue weight is concerned. Roshan220195 (talk) 18:08, 29 March 2012 (UTC)
This phrase comes up a bit, and is used in this article on Coriander, NPR story about how people taste cilantro/coriander (December 2008). Should this be defined here more specifically?(mercurywoodrose)18.104.22.168 (talk) 03:32, 24 September 2012 (UTC)