Reduction of alkynes to trans-alkenes via radical reaction
المؤلف:
University of Missouri System
المصدر:
Organic Chemistry ii
الجزء والصفحة:
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4-10-2020
2455
Reduction of alkynes to trans-alkenes via radical reaction
Alkynes can be reduced to trans-alkenes with the use of sodium dissolved in an ammonia solvent. An Na radical donates an electron to one of the P bonds in a carbon-carbon triple bond. This forms an anion, which can be protonated by a hydrogen in an ammonia solvent. This prompts another Na radical to donate an electron to the second P orbital. Soon after this anion is also protonated by a hydrogen from the ammonia solvent, resulting in a trans-alkene.
R-C≡C-R + 2 Na in NH3 (liq) ——> trans R-CH=CH-R + 2 NaNH2
Mechanism
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