Nuclear magnetic resonance studies of intramolecular hydrogen bonds in monocations of sparteine- and α-isospartene-N-oxides

The crystal structure of sparteine N(16)-oxide sesquiperchlorate

“…This is in agreement with the postulate of Krueger & Skolik (1967), who studied the nuclear magnetic resonance and infrared spectra of perchlorate salts of sparteine-N-oxide.…”

Nuclear magnetic resonance spectrometry

“…a-amino acids can be distinguished from their 8and yisomers by shielding of their carbomethoxyl protons upon tritylation of the amino function (1957). Strong intramolecular hydrogen bonds are found by N I R in monocations of sparteine-and a-isosparteine-S-oxides (1178). Strong intramolecular hydrogen bonds are found by N I R in monocations of sparteine-and a-isosparteine-S-oxides (1178).…”

Chemistry of 3-azabicyclo[3.3.1]nonanes

“…143,145 However, the chair conformation stabilized by hydrogen bonding enhances the basicity of the N-oxide. [244][245][246][247] The structure of a-isosparteine monohydrate (112) has also been determined. 242 The space group is C222x, a = 20.18, b = 10.61, c = 6.84 A, Z = 4.…”