What the study found
The phenanthrenone-derived α,β-unsaturated ketone was found to be more electrophilic than the acenaphthenone-derived one. The authors also report that the phenanthrenone derivative falls in a reactivity range similar to related ortho-quinone methides, while the acenaphthenone derivative is similar in electrophilicity to cyclic α,β-unsaturated lactones with an exocyclic methylene group.
Why the authors say this matters
The authors conclude that the Mayr reactivity scales can be used to systematically select nucleophilic reaction partners for both electrophiles. They present the comparison as a way to place these compounds on known electrophilicity scales.
What the researchers tested
The study compared two dibenzo-annulated α,β-unsaturated ketones: one derived from 9(10H)-phenanthrenone and one from 1-acenaphthenone. The researchers monitored nucleophilic addition of carbanions in DMSO at 20°C by UV-Vis spectroscopy, measured second-order rate constants, and used the Mayr–Patz equation together with published carbanion reactivity parameters to calculate electrophilicity values.
What worked and what didn't
The phenanthrenone-derived Michael acceptor showed the higher electrophilicity, with E = −15.93, compared with E = −18.72 for the acenaphthenone-derived compound. Quantum chemical calculations supported this difference, indicating less advanced bond formation in the transition state and a greater thermodynamic driving force for adduct formation for the phenanthrenone derivative. The abstract does not report any failed experiments.
What to keep in mind
The summary provided here is limited to the abstract, so only the authors' stated results and comparisons can be reported. The abstract does not describe broader limitations, error estimates, or how widely the findings might apply beyond these two compounds.
Key points
- The phenanthrenone-derived α,β-unsaturated ketone was more electrophilic than the acenaphthenone-derived compound.
- Measured carbanion addition rates in DMSO at 20°C were used to calculate electrophilicity values.
- The reported electrophilicity parameters were E = −15.93 for the phenanthrenone derivative and E = −18.72 for the acenaphthenone derivative.
- Quantum chemical calculations supported the higher electrophilicity of the phenanthrenone derivative.
- The authors say the Mayr reactivity scales can help select nucleophilic reaction partners for both electrophiles.
Disclosure
- Research title:
- Phenanthrenone-derived ketone is more electrophilic than acenaphthenone-derived ketone
- Authors:
- Christoph Groß, Jan Brossette, Luc Schellmann, Peter Mayer, Hendrik Zipse, Armin R. Ofial
- Institutions:
- Ludwig-Maximilians-Universität München
- Publication date:
- 2026-01-09
- OpenAlex record:
- View
- Image credit:
- Photo by cottonbro studio on Pexels · Pexels License
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