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1H nmr spectra A. R. Katritzky absolute configuration acid Acta adduct alkaloids alkyl Amer andPharm Annalen anti asymmetric axial aziridines bridgehead Bull Canad carbon atom carbonyl catalytic reduction Chem chemical shifts chemistry chiral center cis and trans cis isomer Comm compounds conformation cycloaddition Decahydroquinolines derivatives dimer dipole double bond enantiomers epimeric Equation equatorial equilibrium ester example formed gave Helv Heterocyclic Chem intramolecular intramolecular cyclization isomeric J.C.S. Chem J.C.S. Perkin jV-methyl kJ mol-1 L. A. Paquette lone pair McKenna methanol methiodide methyl methyl group mixture of cis molecule N. J. Leonard nitrogen atom nitrogen inversion nitrogen lone pair nmr spectroscopy obtained olefins optically active oxidation Pharm phenyl photolysis piperidines prepared protons pyrrolidines quinolines quinolizidine R. A. Y. Jones racemic ratio reaction rearrangement rotation salts Section Soc chim Soc Japan sodium stereochemical stereochemistry stereoselective stereospecific steric structure studied substituents synthesis temperature Tetrahedron Letters trans isomer Witkop X-ray yields