Lanthanide shift reagents , nuclear magnetic resonance

Lanthanide enolates as nuclear magnetic resonance shift reagents... [Pg.787]

C. Nuclear Magnetic Resonance Conformational study of 3-substituted thietane 1-oxides. Lanthanide shift reagent approach. ... [Pg.277]

Nuclear Magnetic Resonance Chiral Lanthanide Shift Reagents (Sullivan) 10 287... [Pg.300]

J. Reuben, in Progress in Nuclear Magnetic Resonance Speetroscopy , Vol. 9, Pt. 1 Lanthanide Shift Reagents m NMR Spectroscopy Principles, Methodology and Applications , Pergamon Press, Oxford, 1973. [Pg.113]

Nuclear Magnetic Resonance Spectroscopy.—As noted above, conformational analysis of bicyclo[3.3.1]nonanes is still a topic of considerable interest. A variable-temperature n.m.r. analysis now provides the first case in which the boat-chair-chair-boat equilibrium is directly observed in the amines (17) and (18). In a related case, re-examination of the acetal (19) suggests that the preferred conformation involves a chair carbocyclic ring and a boat heterocyclic ring. This conclusion was made by n.m.r. analysis, using lanthanide shift reagents, by a study of nuclear Overhauser effects, and by measurement of relaxation times of protons. Details have been reported for other 3-azabicyclo[3.3.1]nonanes, and the non-additivity of substituent effects on chemical shifts in 9-thiabicyclo[3.3.1]non-2-enes has been analysed. Both and n.m.r. data have been reported for a series of 9-borabicyclo[3.3.1]non-anes and their pyridine complexes. [Pg.384]

Feibush, B. Richardson, M.F. Sievers, R.E. Springer, C.S., Jr. Complexes of nucleophiles with rare earth chelates. I. Gas chromatographic studies of lanthanide nuclear magnetic resonance shift reagents. Journal of the American Chemical Society 1972, 94 (19), 6717-6724. [Pg.73]

FIGURE 14 Molecular structures of two commonly used lanthanide shifts reagents in H nuclear magnetic resonance (NMR) spectoscopy. [Pg.395]

Glockhart 1976 Lanthanide shift reagents in nuclear magnetic resonance spectroscopy. CRC Critical Reviews in Anal Chem 6 69-130... [Pg.113]

Goering H L, Eikenberry J N, Koermer G S, Lattimer C J 1974 Direct determination of enantiomeric compositions with optically active nuclear magnetic resonance lanthanide shift reagents. J Am Chem Soc 96 1493-1501... [Pg.113]