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the claim
Stabilized ylides yield trans alkenes in the Wittig reaction
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

That stabilized ylides yield trans (E) alkenes in the Wittig reaction is a standard textbook chemical principle, corroborated by general organic chemistry literature.

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The analysis

The claim is a well-established textbook fact regarding the stereochemical outcome of the Wittig reaction (stabilized ylides give predominantly E/trans-alkenes, whereas non-stabilized ylides give Z-alkenes). While it is foundational chemical knowledge, multiple retrieved papers touch upon Wittig stereoselectivity or E/Z control. Therefore, COMMON_KNOWLEDGE is appropriate, with supportive papers correctly indexed.

Everything we examined (12)
We also searched for evidence AGAINST this claim, not only for it.
  1. Bond-Forming and -Breaking Reactions at Sulfur(IV): Sulfoxides, Sulfonium Salts, Sulfur Ylides, and Sulfinate Salts.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. New Developments of the Principle of Vinylogy as Applied to π-Extended Enolate-Type Donor Systems.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Recent Strategies in the Nucleophilic Dearomatization of Pyridines, Quinolines, and Isoquinolines.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Vinylene-Linked 2D Conjugated Covalent Organic Frameworks by Wittig Reactions.peer-reviewedsupportsnot shown: read and graded, but this claim needs no citation to stand
  5. Garner's aldehyde as a versatile intermediate in the synthesis of enantiopure natural products.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Enantioselective Potassium-Catalyzed Wittig Olefinations.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. On the origins of stereoselectivity in the Wittig reactionpeer-reviewedsupportsnot shown: read and graded, but this claim needs no citation to stand
  8. Polymer-supported triphenylphosphine: application in organic synthesis and organometallic reactions.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Transition Metal Catalyst Free Synthesis of Olefins from Organoboron Derivatives.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Recent highlights in the synthesis and biological significance of pyrazole derivatives.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. A three-membered ring approach to carbonyl olefination.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Wittig and Wittig-Horner Reactions under Sonication Conditions.peer-reviewedsupportsnot shown: read and graded, but this claim needs no citation to stand
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → COMMON KNOWLEDGE · 006 Aug 2026
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