Mixed aggregation of lithium enolates and lithium halides with lithium 2, 2, 6, 6-tetramethylpiperidide (LiTMP)

…, JH Gilchrist, AT Harrison, DJ Fuller…

Index: Hall, Patricia L.; Gilchrist, James H.; Harrison, Aidan T.; Fuller, David J.; Collum, David B. Journal of the American Chemical Society, 1991 , vol. 113, # 25 p. 9575 - 9585

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Citation Number: 128

Abstract

Abstract: 6Li and ISN NMR spectroscopic studies of [6Li]-LiTMP and [6Li,'5N]-LiTMP support an earlier suggestion that LiTMP exists as a dimer-monomer mixture in THF. In the presence of [6Li]-lithium cyclohexenolate as a representative enolate, one observes mixed aggregates with 2: I, 1: 1, and 2: 2 LiTMP/enolate stoichiometries. Evidence of conformational isomerism is observed in the slow-exchange limit. Studies of conformationally mobile [6Li]-lithium di- ...