Low-temperature 19 F NMR spectroscopy of 1-fluoro-1-lithioethenes: Stability, shifts and unexpected coupling constants
…, R Hrabal, J Czernek, I Bartošová, O Paleta…
Index: Kvicala, Jaroslav; Hrabal, Richard; Czernek, Jiri; Bartosova, Ivana; Paleta, Oldrich; Pelter, Andrew Journal of Fluorine Chemistry, 2002 , vol. 113, # 2 p. 211 - 218
Full Text: HTML
Citation Number: 14
Abstract
Half-lives and fluorine atom shifts of stabilized 1-fluoro-1-lithioethenes bearing hydrogen, fluorine, phenyl, and/or dimethylphenylsilyl groups in the β-positions have been determined by a low-temperature 19F NMR spectroscopy. Some 1-fluoro-1-lithioethenes displayed an exceptionally low value of the trans-3JFF coupling constant. Stereoselectivity of carbenoid formation, as well as an effect of configuration on the stability is discussed.
Related Articles:
[Tolman, Vladimir; Spronglova, Pavla Collection of Czechoslovak Chemical Communications, 1983 , vol. 48, # 1 p. 319 - 326]
[Gassen, K.-R.; Bielefeldt, D.; Marhold, A.; Andres P. Journal of Fluorine Chemistry, 1991 , vol. 55, # 2 p. 149 - 162]
[Gassen, K.-R.; Bielefeldt, D.; Marhold, A.; Andres P. Journal of Fluorine Chemistry, 1991 , vol. 55, # 2 p. 149 - 162]