Talk:Arene substitution pattern

Link
I followed this link from "para-" on the disambiguation page, expecting to find information on the prefix meanin "Beside; near; alongside". Why is it linked to a rather involved page on chemistry? —Preceding unsigned comment added by 88.105.81.182 (talk) 19:19, 20 November 2007 (UTC)


 * It should link to para V8rik (talk) 20:06, 20 November 2007 (UTC)


 * I have now modified the dab page to try to send both linguists and chemists (like me) to the right place. For the first (linguistic) meaning, I didn't find an appropriate article on the para affix so I removed the link on para and inserted one for affix. For the chemical meaning further down, I inserted the words "in chemistry" to warn away users interested in other meanings.  Dirac66 (talk) 22:46, 20 November 2007 (UTC)

I completely failed to comprehend the ipso-peri section
Having completely failed to mentally grasp those images, I roamed the Intertubes until I found this:


 * Ipso, Meso, and Peri Substitutions in Organic Chemistry — August 2018

Particularly the main image at the top of that page helped the penny to finally drop: image

Drawn differently, I finally grasped that the blue arrow thing implies a second instance of R (designated R').

But then there's more:

Peri-substitution occurs in naphthalenes for substituents at the 1 and 8 positions.

I can find no reference that documents carbon position 8. When I count cyclodecane myself, by the obvious approach of crawling around the outside like an ant, the positions illustrated come out as 1 and 9 (with final position 10 in between).

The following rather imposing document does not illustrate how to enumerate the carbons in cyclodecane.


 * Nomenclature of Cycloalkanes — updated 5 June 2019

Nor was I able to find such an enumeration in any obvious Wikipedia page concerning cyclic carbon chemistry or formal naming systems.

More work required. &mdash; MaxEnt 16:00, 23 June 2020 (UTC)