Abstract
AbstractThe mass spectral behaviour of some quinoline‐type alkaloids, 3,4‐dihydro‐2H,5H‐pyrano[3,2‐c]quinolin‐5‐ones, isomeric 3,4‐dihydro‐2H,5H‐pyrano[2,3‐b]quinolin‐5‐ones and 2H,5H‐pyrano[3,2‐c]quinolin‐5‐ones, was studied in detail with the aid of linked scans, exact mass measurements and collisional spectrometry. The occurrence of a partial isomerization of the differently annulated isomers to a common, open‐chain structure is discussed.
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