Photodissociation experiments and ion/molecule reactions with pyridine and hex-l-ene show that [C3H601+' ions from propylene oxide isomerize to the vinyl methyl ether structure. [C3H60]+' fragment ions from methylsubstituted 1,3-dioxolanes have lower internal energies. In these eases a mixture of photodissociating ring-opened propylene oxide ions and vinyl methyl ether ions is observed.
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