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the claim
The mechanism of the Wittig reaction proceeds via oxaphosphetane intermediates
the verdict
SUPPORTED
the evidence backs this
confidence 90/100

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

Evidence for · 6
The modern interpretation of the Wittig reaction mechanism.
2013 · cited by 283
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.
2014 · cited by 44
Indicates that the reaction involves cycloaddition leading to oxaphosphetane intermediates while bypassing betaines.
The Phospha-Bora-Wittig Reaction.
2021 · cited by 30
References the classical oxaphosphetane intermediate in the Wittig reaction when discussing analogous phospha-bora-Wittig reactions.
Enantioselective Potassium-Catalyzed Wittig Olefinations
2024 · cited by 27
Notes that the olefination reaction proceeds via the formation of the oxaphosphetane adduct.
Dissection of the Mechanism of the Wittig Reaction.
2019 · cited by 20
Details how early interactions clamp the bonds to form oxaphosphetanes rather than stable betaines.
On the Mechanism of Trimethylphosphine-Mediated Reductive Dimerization of Ketones.
2018 · cited by 16
Describes the final homocoupling product forming through the oxaphosphetane intermediate.
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first checked01 Aug 2026
judged → SUPPORTED · 9001 Aug 2026
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