Talk:Oxepin

antiaromatic?

Is this compound antiaromtic (and why the epoxide might be favoured)? John Riemann Soong (talk) 19:23, 3 September 2009 (UTC)

I think it slightly deviates from planarity so I think it's not antiaromatic (or at least not as much as it were, were it planar, c.f. cyclobutadiene). Alfa-ketosav (talk) 17:51, 25 January 2021 (UTC)

K of benzene oxide <=> oxepin

What is the equilibrium constant for benzene oxide <=> oxepin? JGHFunRun (talk) 01:32, 19 June 2023 (UTC)

@JGHFunRun: By theoretical calculations in gas-phase, they're equal energy (within error of calculations). Experimentally it's highly solvent dependent (even which is more stable than the other). A good recent lead ref is:

• Schleif, Tim; Merini, Melania Prado; Sander, Wolfram (2020). "The Mystery of the Benzene-Oxide/Oxepin Equilibrium—Heavy-Atom Tunneling Reversed by Solvent Interactions". Angew. Chim. Int. Ed. 59 (46): 20318–20322. doi:10.1002/anie.202010452.

DMacks (talk) 02:09, 19 June 2023 (UTC)

Thank you! JGHFunRun (talk) 02:51, 19 June 2023 (UTC)