Talk:Biphenyl

If anyone is watching
If anyone is watching this page, there is an error in the table: "Solubility = Insoluble"? I know for a fact that biphenyl is soluble in benzene, so maybe "Solubility in Water" was intended? I know neither what was originally intended by the field nor its solubility in various solvents, so I will not by editing it. Thermodude 13:37, 27 July 2007 (UTC)

NFPA rating
Updated NFPA rating according to Sigma Aldrich MSDS (2-0-0)Xenofonos (talk) 17:48, 3 April 2008 (UTC)

Carcinogen?
Since biphenyl is essentially two bonded benzene molecules, and since benzene is a known carcinogen, is biphenyl a known or suspected carcinogen?--Metalhead94 (talk) 14:22, 20 September 2008 (UTC)
 * No, not known or suspected to be a carcinogen by either the European Union or the IARC. There are plenty of compounds which contain benzene rings which are not carcinogenic (see phenylalanine, for example). Physchim62 (talk) 14:37, 20 September 2008 (UTC)
 * Thanks. Just a thought.--Metalhead94 (talk) 14:39, 20 September 2008 (UTC)

SMILES discrepancy between here and the SMILES page
On this the biphenyl page the SMILES is shown as: c1ccc(cc1)c2ccccc2  while on the SMILES page it is shown as:  c1ccccc1-c2ccccc2 (biphenyl is used as an example there). Which is correct? I think its the one on the SMILES page. (Extremo88 (talk) 14:37, 22 April 2012 (UTC))
 * OK forget it they are just two equivalent strings for the same compound. Extremo88 (talk) 14:49, 22 April 2012 (UTC)
 * This 12 elapsed mins helps reestablish my faith in this place, and in humankind in general. Cheer, Le PRof Leprof 7272 (talk) 19:23, 12 June 2014 (UTC)

Reactants
I can't seem to find a reference that says benzene reacts with toluene to form biphenyl -- it should be 2 benzene molecules reacting to form biphenyl and H2, shouldn't it?
 * It does not, and no. Le Prof Leprof 7272 (talk) 19:25, 12 June 2014 (UTC)
 * References:
 * 1. Maerker, J. B., & Weiss, A. H. (1965). Catalytic hydrodealkylation of alkyl substituted benzenoid hydrocarbons. United States Patent Office, US3178486, 1. Retrieved from http://www.google.com/patents/US3178486
 * 2. Alibeyli, R., Yeniova, H., Bilgesü, a. Y., & Karaduman, A. (2002). KINETIC PECULIARITY OF CO-PRODUCTION OF BENZENE AND NAPHTHALENE FROM AROMATIC MIXTURES BY THERMAL HYDRODEALKYLATION. Petroleum Science and Technology, 20(1-2), 51. doi:10.1081/LFT-120002086
 * Still can't find a reference that says benzene reacts with toluene to form biphenyl (although the stoichiometry works as shown at the time of writing this comment). Can we update the wikipedia article to show the correct reaction? — Preceding unsigned comment added by 1.121.136.47 (talk) 00:15, 22 June 2014 (UTC)
 * For that kind of info, the "bible" = Ullmann's (which is cited in Biphenyl!). Sayeth Ullmann's: "Biphenyl is currently obtained mainly as a byproduct in the production of benzene by thermal or catalytic hydrodealkylation of toluene. ... carried out ... at 700 ... with a hydrogen pressure ...  Toluene conversion... from 35 to 85 %, with methane being formed at 2.5 mol% above the stoichiometric."  --Smokefoot (talk) 01:36, 22 June 2014 (UTC)

Bravi grazie
…this is a perfect case where addition of the space filling model adds value otherwise not easily or thoroughly achieved. Thanks for effort, and thanks for not making it spin. In future, if such figures were accompanied, in a legend, by an explanation of methods and purpose of pose, like this Description, I for one would become by an ecstatic fit, likely never ceasing. (A sight worth the admission fee.) Cheers, onward and upward, and again, bravo, brava, grazie. Le Prof Leprof 7272 (talk) 19:21, 12 June 2014 (UTC)

Links in stereochemistry section
I have updated the "optical stability" link to reflect the reorganization of the stereochemistry articles. It appears to me, though, that the link may no longer be relevant. I don't know enough chemistry to be sure. The Uninvited Co., Inc. 15:20, 21 May 2015 (UTC)

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Bisphenol?
I'm conflicted about this hatnote because while it has similar spelling hopefully the change in suffix from yl to ol is somewhat visible.

It is hard to disambiguate the two in a single line for a layperson. It's hard to draw much structural comparison because there are two changes, the hydroxyls and the methane or other joint in the middle. Biphenyl/diphenyl and bisphenol are as alike as a decagon and a dodecahedron - there's some similar parts but everything around them is different.

It may be worth comparing bisphenols to biphenyl methane (as suggested on the bisphenol page) but that doesn't quite explain the extra hydroxyl groups. It may be worth looking through diphenol or other pages with the di- prefix for other ideas. Techhead7890 (talk) 12:06, 20 January 2020 (UTC)