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Mechanistic definition of trimethylstannylation of 1,4-dihalobicyclo[2.2.2]octanes: A labeling experiment excludes intermediacy of [2.2.2]propellane but suggests a novel radical chain mechanism
Journal article   Peer reviewed

Mechanistic definition of trimethylstannylation of 1,4-dihalobicyclo[2.2.2]octanes: A labeling experiment excludes intermediacy of [2.2.2]propellane but suggests a novel radical chain mechanism

W Adcock, V S Iyer, W Kitching and David James Young
Journal of Organic Chemistry, Vol.50(20), pp.3706-3710
1985
url
https://doi.org/10.1021/jo00220a006View
Published Version

Abstract

nucleophilic substitutions
A specifically labeled 2H derivative of 1-bromo-4-iodobicyclo[2.2.2]octane has been synthesized and reacted with (trimethylstannyl)lithium. A full product and 2H-label profile has been established by 1H, 2H, 13C, and 119Sn NMR spectroscopy, and the intermediacy of [2.2.2]propellane can be disregarded. The results, along with others for additional 1,4-dihalobicyclo[2.2.2]octanes, are best accommodated by a chain mechanism (involving radical anions and free radicals) somewhat akin to the S RN1 mechanism for electron-transfer initiated aliphatic and aromatic nucleophilic substitutions. © 1985 American Chemical Society.

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