Talk:Aldehyde
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Article Grading: The following comments were left by the quality and importance raters: (edit · history · watch · refresh) Chemistry is not my expertise but.... is this quoted text misleading? (chemical formula O=CH-) ?should it instead read as?: (chemical formula O=C-H) Electricmic 21:07, 26 September 2007 (UTC) |
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[edit] pKa
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?
[edit] nomenclature
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.
In any case there is a lack of clarity. Could somebody more qualified please look into this? —The preceding unsigned comment was added by 203.81.207.114 (talk • contribs) 20:45, 11 June 2007 (UTC)
- The Aldehyde article has been revised. Spacepotato 09:26, 4 August 2007 (UTC)
[edit] acyl vs aldehyde
Are they exactly the same thing?199.76.186.8 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)
