Studies in mass spectrometry. Part XIV. The effect of conformation on the electron impact-induced fragmentation of adducts of p-benzoquinone and 1,1′-bicycloalkenyls

Electron impact-induced double hydrogen migration leading to the formation of ions a from adducts of p-benzoquinone and 1,1′-bicycloalken-1-yls has been found to be suppressed when the sizes of rings c and D of the adducts are increased. This effect is explained in terms of different distances between the migrating hydrogen atoms and the carbonyl groups, which are affected by the conformations of the central ring B and of rings C and D.