Answer 6.4

a) Write down the alpha-cleavages of butanone molecular ion.

alpha-Cleavage of butanone

b) Ethyl-methyl-propylamine molecular ions can undergo a total of five different alpha-cleavages, three of them resulting in isobaric product ions. Identify these pathways.

alpha-Cleavage of ethyl-methyl-propanamine

c) Below, four isomeric alkylcyclohexanone molecular ions are shown. Decide which of these can be distiguished from the others by means of their product ions from double-alpha cleavage.

Double alpha-cleavages of cyclohexanones