1. Metal—double bond interactions : IV. A study of lithium—π-electron interactions in 3-butenyllithium by 7Li and 1H NMR spectroscopy
James B. Smart, Robert Hogan, Paul A. Scherr, Merle T. Emerson, John P. Oliver
Journal of Organometallic Chemistry
Volume 64, Issue 1, 1 January 1974, Pages 1–17
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http://dx.doi.org/10.1016/S0022-328X(00)93025-0 Simon L. Xu , Haiji Xia , Harold W. Moore
J. Org. Chem., 1991, 56 (21), pp 6094–6103
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http://dx.doi.org/10.1021/jo00021a025