[11] Characterization of retinylidene iminium salts by high-field 1H and 13C nuclear magnetic resonance spectroscopy

Publisher This chapter describes the preparation and characterization of some retinylidene iminium salts using high-field 1H and 13C NMR spectroscopy. In obtaining an IH NMR spectrum of a retinylidene iminium salt such as 3, a small sample of the salt is dissolved in an inert deuterated solvent, in the absence of any water. The primary objectives in characterizing an iminium salt such as 3 are to ensure that protonation of the imine has …