Abstract
A study of the chemical ionization mass spectral characteristics of a series of derivatized 1-benzyltetrahy-droisoquinoline alkaloids is presented. Tetrahydropapaveroline and some related benzyltetrahydroisoquinolines were converted to their corresponding O-trimethylsilyl of N-trifluoroacetyl-O-trimethylsilyl derivatives prior to analysis by combined gas chromatographic methane chemical ionization mass spectrometry. The chemical ionization mass spectra of the derivatized alkaloids are compared to the electron impact mass spectra of the N-trifluoroacetyl-O-trimethylsilyl derivative of tetrahydropapaveroline, a representative benzyltetrahydroisoquinoline alkaloid. The effects of the nitrogen substituent and ion source pressure on the relative abundance of significant ions in the chemical ionization mass spectra of these alkaloids are also described.
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