Features of the splitting out of a methyl radical from lycoctonine alkaloids under electron impact
The mass spectra of 53 alkaloids and their derivatives are considered. It is known that the presence of a C6(OCH3)-C7(OH)-C8 (OH) grouping in C19-diterpene alkaloids leads to a high intensity of the (M - 15)+ ions at the expense of the C6(OCH3) group and considerably suppresses the competing processes of forming the [M - OH (OCH3)]+ ions in the alkaloids and the (M - 56)+ ions in the anhydroxy bases. When the above-mentioned grouping is absent, the (M - 15)+ ions are formed mainly by the splitting out of a ĊH3 from a N-ethyl group.
The structure of delphinifoline, a diterpenoid alkaloid from aconitum delphinifolium
Abstract The structure of delphinifoline, a minor alkaloid of Aconitum delphinifolium DC, was established by spectroscopic methods, and X-ray crystallography.
Lupin alkaloids from teratogenic and nonteratogenic lupins. II. Identification of the major alkaloids by tandem gas chromatography-mass spectrometry in plants producing crooked calf disease.
The major alkaloids of lupin plants producing crooked calf disease were identified by tandem gas chromatography-mass spectrometry and infrared analysis. The gas chromatography peak invariably present in teratogenic plants proved to be anagyrine. A minor but irregular contaminant of the peak was α-isolupanine. Other alkaloids present but apparently not associated with crooked calf disease were lupanine and two others that were probably epimethoxylupanine and 5,6-dehydrolupanine.