Talk:Gallic acid: Difference between revisions

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The COOH group has a pKa of 4.5, and the phenolic OHs have pKa of 10.

this is wrong a priori, you cannot deprotonate all three phenols at once. I don't know which one deprotonates first so i'm not changing it but my guess is on meta. 24.181.29.106

Synthetic route for Gallic acid -> Mescaline

I don't know how to add a citation to this page, but a synthesis of Mescaline from Gallic acid can be found here :

[1] A New Synthesis of Mescaline, Makepeace U. Tsao, J. Am. Chem. Soc. 5495-5496 (1951) —Preceding unsigned comment added by 212.238.246.56 (talk) 11:35, 9 August 2008 (UTC)[reply]

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chemical properties citation needed

do you think, phytochemicals.info is a site worth a citation??? esp. because half the article is a citation from there -hig- —Preceding unsigned comment added by 77.132.208.48 (talk) 23:12, 25 April 2009 (UTC)[reply]

pKa-Value

As I am a German Wikipedia user, I read in the German article that the pKa (or pKs as it is called in german) is not 4.5 but 3.13 wich seems correct according to the literature (e.g. Bykova L.N., Petrov S.I.& Blagodatskava Z.G. (1970). Relative acidity of phenol and its derivatives in a medium of nonaqueous solvents. Zh. Obshch. Khim., 40, 2295-3000. and the citation No 3 from the german article). I also think that a higher acidity could be expected than for benzoic acid. This thought also fits following german article (you SHOULD translate that one too, if possible) http://de.wikipedia.org/wiki/Hydroxybenzoes%C3%A4uren (Hydroxybenzoesäuren).

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 == chemical properties citation needed ==
 do you think, phytochemicals.info is a site worth a citation??? esp. because half the article is a citation from there -hig-  <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/77.132.208.48|77.132.208.48]] ([[User talk:77.132.208.48|talk]]) 23:12, 25 April 2009 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
+== pKa-Value ==
+As I am a German Wikipedia user, I read in the German article that the pKa (or pKs as it is called in german) is not 4.5 but 3.13 wich seems correct according to the literature (e.g. Bykova L.N., Petrov S.I.& Blagodatskava Z.G. (1970). Relative acidity of phenol and its derivatives in a medium of nonaqueous solvents. Zh. Obshch. Khim., 40, 2295-3000. and the citation No 3 from the german article). I also think that a higher acidity could be expected than for benzoic acid. This thought also fits following german article (you SHOULD translate that one too, if possible) http://de.wikipedia.org/wiki/Hydroxybenzoes%C3%A4uren (Hydroxybenzoesäuren).