Study of Unusually High Rotational Barriers about SN Bonds in Nonafluorobutane-1-sulfonamides: The Electronic Nature of the Torsional Effect
作者:Ilya M. Lyapkalo、Hans-Ulrich Reissig、Andreas Schäfer、Armin Wagner
DOI:10.1002/hlca.200290006
日期:2002.12
bond in N,N-disubstituted nonafluorobutane-1-sulfonamides 1 can easily be detected by NMR measurements at room temperature. This effect causes magneticnonequivalence of otherwise identical geminal substituents in symmetrical staggered ground-state conformation A. The torsional barriers determined (62–71 kJ⋅mol−1) proved to be the highest ever observed for sulfonamide moieties. They are comparable to