Talk:Benzaldehyde
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Primary component of almond oil?
editThis seems strange to me, as I expect oils to be primarily aliphatic chains.
Does anyone has a source for this fact? J1812 (talk) 05:56, 29 January 2013 (UTC)
- Triglycerides are the principal components of most fixed/fatty/non-volatile plant and animal oils. Cooking oils (including the "almond oil" that you might buy under that name in the baking ingredients section of a grocery store) is the fixed oil of sweet almonds.
- Benzaldehyde is the principal component of the essential/volatile oil of bitter almonds. This essential oil can be obtained (per Duplais) by first crushing and pressing the (bitter) almonds to remove the fixed oil, macerating the resulting "almond cake" (i.e., the pomace that would be the waste product if what you were after was the fixed oil) in water for 24 hours (to allow the breakdown of amygdalin, a compound that is essentially glucose + benzaldehyde + hydrogen cyanide), steam distilling the "thin broth" that results, and then further processing it in order to remove the aforementioned cyanide.
- Nota bene: This is a conceptual explanation, not a detailed instruction manual; don't try this (or pretty much anything else involving bitter almonds) at home without significant further research, into both safety procedures and your local laws.
- 2603:7081:7E3E:DB14:1161:20E9:E099:D449 (talk) 22:44, 6 May 2023 (UTC)
I don't know if this helps but: no source but I know it to be true. a good source for it. approx. 90% — Preceding unsigned comment added by 174.44.208.186 (talk) 22:52, 7 June 2013 (UTC)
pKa
editCan we get a pKa value for this? —Preceding unsigned comment added by 137.22.97.75 (talk) 04:30, 10 May 2011 (UTC)
Use in drugs
editBenzaldehyde is listed as a precursor by the DEA for the manufacture of amphetamines and phenyl-2-propanone. Not sure if this belongs in the uses section, as it says that it is used to make pharmaceuticals already. Source: http://www.usdoj.gov/dea/pubs/abuse/2-chem.htm --71.227.190.111 15:44, 3 August 2006 (UTC)
Aldehyde substituent? - is there such a thing
edit"Benzaldehyde (C6H5CHO) is a chemical compound consisting of a benzene ring with an aldehyde substituent." We know what this sentence means, but I guess I would say a formyl substituent. Is an aldehyde a functional group?--Smokefoot 03:35, 26 August 2006 (UTC)
- You may be right, what does Jerry March say about this (my copy is in the lab ..). --Dirk Beetstra T C 07:01, 26 August 2006 (UTC)
WikiProject Food and drink Tagging
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Roast Fois Gras benzaldehyde
editIs it worth mentioning in the article that Heston Blumenthal's Fat duck restaurant served a dish called fois gras benzaldehyde, which featured foods containing bezaldehyde?
Image planes
editCan we change the images at the top so that they are displayed in the same plane of view? At the moment there may be some confusion over the double bond on the oxygen being on the wrong side on the image. — Preceding unsigned comment added by 195.137.59.127 (talk) 14:18, 5 April 2012 (UTC)
Safety issues?
editI checked the source listed for "Benzaldehyde has been classified as a hazardous substance by the United States Environmental Protection Agency." and found no evidence for that statement in the cited source. Is there something I'm not understanding? — Preceding unsigned comment added by 2602:306:3168:DCE0:A0C4:E5AA:52AB:C3F5 (talk) 04:52, 21 April 2015 (UTC)
pKa value completely wrong.
editWikipedia has a really big issue with pKa values. The pKa of benzaldehyde is about 45 (not 14.90 like you have written on this page without any reference), and that is for a hydrogen on the benzene-ring. You cannot deprotonate the aldehyde-group by any known method.84.210.54.80 (talk) 16:04, 7 December 2015 (UTC)
Done. Thanks for noticing. Wikipedia is a collaborative projects and lots of stuff gets messed up.--Smokefoot (talk) 17:50, 7 December 2015 (UTC)
- For what it's worth, the CRC Handbook gives a pKa value of 14.90 for benzaldehyde. I cannot figure out what this pKa is supposed to mean, so I did not re-add it to the article, but it might not be complete rubbish after all. Yongrenjie (talk) 18:31, 7 January 2019 (UTC)
- Going by an answer I found on chemistry stackexchange (https://chemistry.stackexchange.com/a/107626), this would appear to be a net equilibrium constant for the combination, in aqueous solution, of formation of a geminal diol and deprotonation of one of the two resulting hydroxyl groups. 2603:7081:7E3E:DB14:1161:20E9:E099:D449 (talk) 22:51, 6 May 2023 (UTC)
- For what it's worth, the CRC Handbook gives a pKa value of 14.90 for benzaldehyde. I cannot figure out what this pKa is supposed to mean, so I did not re-add it to the article, but it might not be complete rubbish after all. Yongrenjie (talk) 18:31, 7 January 2019 (UTC)
