Transferts d'hydrogènes dans les cations radicaux ethylène‐acetals dérivés de cyclopentanones et cyclohexanones

Abstract

The isomerisation process of ethylene-acetal radical ions of low internal energy has been reinvestigated in more detail. The ring contraction of cyclohexane derivatives into methylcyclopentanes is quite general for these ions. The relative rates of [l, n] H transfers to the C free radical resulting from C-C cleavage a to the acetal group plays the most important part in the mechanism.

Distonic radical cations in gaseous and condensed phase

“…10). Similar ring-opening ring-closure reactions have been described for cyclic acetals (246), and for distonic isomers of ketone (247) and carboxylic acid (221,226) molecular ions (e.g., eq. 84).…”