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Stereochemical and structural assignment to benzomorphans by mass spectrometry

The fragmentation of some alkyl‐substituted‐6,7‐benzomorphans upon electron impact (70eV) is characteristic. The relative intensities of some ions varies in a predictable manner depending on the configuration of the C‐9 hydrogen atom. Configuration and structure of 5,9‐disubstituted‐6,7‐benzomorphans can be assigned by mass spectrometry even when only one isomer of a structure capable of existing in diastereoisomeric forms is available.