Structure and Spectral Properties of β-Carbolines,I: 13C-NMR and Mass Spectra of Decahydro-5H-pyrido[1′,2′;5,1]-imidazo[3,4-a]-β-carbolines

¹³C-NMR and the electron impact mass spectra of the β-carboline derivatives 1 – 18 were examined. The structure of the possible diastereomers is discussed. A quantitative relationship between the relative intensity of ions a in the mass spectra of 1 – 18 and the structure of substituents R was found.