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the claim

The mechanism of the Wittig reaction proceeds via oxaphosphetane intermediates

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Extensive experimental and computational evidence confirms that the Wittig reaction proceeds via cyclic oxaphosphetane intermediates.

The analysis

The retrieved papers consistently support the well-established mechanism of the Wittig reaction, demonstrating that it proceeds via oxaphosphetane intermediates (often bypassing betaines as discrete stable intermediates in salt-free conditions). There are no refuting papers.

Evidence for · 6
The modern interpretation of the Wittig reaction mechanism.
Recorded source metadata

Peter A. Byrne, D. Gilheany. The modern interpretation of the Wittig reaction mechanism.. 2013. https://doi.org/10.1039/c3cs60105f

Reviews evidence showing that Li salt-free Wittig reactions proceed via oxaphosphetane as the first-formed and only intermediate.

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More for · 5
Isotope effects, dynamic matching, and solvent dynamics in a Wittig reaction. Betaines as bypassed intermediates.
Recorded source metadata

Chen Z, Nieves-Quinones Y, Waas JR, Singleton DA. Isotope effects, dynamic matching, and solvent dynamics in a Wittig reaction. Betaines as bypassed intermediates.. 2014. https://doi.org/10.1021/ja506497b

Indicates that the reaction involves cycloaddition leading to oxaphosphetane intermediates while bypassing betaines.

The Phospha-Bora-Wittig Reaction.
Recorded source metadata

Borys AM, Rice EF, Nichol GS, Cowley MJ. The Phospha-Bora-Wittig Reaction.. 2021. https://doi.org/10.1021/jacs.1c06228

References the classical oxaphosphetane intermediate in the Wittig reaction when discussing analogous phospha-bora-Wittig reactions.

Enantioselective Potassium-Catalyzed Wittig Olefinations
Recorded source metadata

Jake Z. Essman, Eric N. Jacobsen. Enantioselective Potassium-Catalyzed Wittig Olefinations. 2024. https://doi.org/10.1021/jacs.4c00564

Notes that the olefination reaction proceeds via the formation of the oxaphosphetane adduct.

Dissection of the Mechanism of the Wittig Reaction.
Recorded source metadata

Farfán P, Gómez S, Restrepo A. Dissection of the Mechanism of the Wittig Reaction.. 2019. https://doi.org/10.1021/acs.joc.9b02224

Details how early interactions clamp the bonds to form oxaphosphetanes rather than stable betaines.

On the Mechanism of Trimethylphosphine-Mediated Reductive Dimerization of Ketones.
Recorded source metadata

Arturo Espinosa Ferao. On the Mechanism of Trimethylphosphine-Mediated Reductive Dimerization of Ketones.. 2018. https://doi.org/10.1021/acs.inorgchem.7b02816

Describes the final homocoupling product forming through the oxaphosphetane intermediate.

The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 9001 Aug 2026
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