Patent ID: 7714172

Claim:
A process for preparing a cyclic ketone having from 7 to 16 carbon atoms which comprises at least the steps (a) oxidizing a composition (I) comprising at least one cyclic alkene which has from 7 to 16 carbon atoms and at least one C—C double bond by means of dinitrogen monoxide to give a composition (A), (b) treating the composition (A) with at least one base to give a composition (B), (c) hydrogenating the composition (B) in the presence of at least one catalyst to give a composition (C), (d) purifying of the composition (C), comprising at least the steps (di) thermal treating the composition (C) with at least one acid or at least one catalyst comprising at least one transition metal, (dii) further purifying by a method selected from the group consisting of distillation, extraction and crystallization.