Nuclear magnetic resonance studies. XXX.Hydrogen–deuterium exchange in bicyclo[3.2.1] and -[2.2.2]octenes through allylic and vinylic anions
作者:
A. K. Cheng,
J. B. Stothers,
期刊:
Canadian Journal of Chemistry
(NRC Available online 1977)
卷期:
Volume 55,
issue 1
页码: 50-55
ISSN:0008-4042
年代: 1977
DOI:10.1139/v77-009
出版商: NRC Research Press
数据来源: NRC
摘要:
Bicyclo[3.2.1]oct-2-ene undergoes hydrogen–deuterium exchange through allyl and vinyl carbanionic intermediates under strongly basic conditions,tert-BuO−/tert-BuOD)at 185 °C. Only allylic exchange had been observed in previous studies withtert-BuO−/DMSO. Since the 2-tert-butoxybicyclo[3.2.1]octanes are stable under these conditions an addition–elimination sequence cannot account for exchange at C-3. The relative rates of exchange at C-2, -3, and -4, and the stereoselectivity at the allylic site were determined by2H nmr. For comparison, the rate of olefinic exchange in bicyclo[2.2.2]octene was also measured.
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