Acylcyclopentanones VII (1): Synthesis of 2, 5‐diacetyl‐1‐cyclopentanone and 2, 5‐dibenzoyl‐1‐cyclopentanone

Abstract 2, 5‐Diacetyl‐1‐cyclopentanone and 2, 5‐dibenzoyl‐1‐cyclopentanone are obtained by base induced cyclisations of ethyl 2‐acetyl‐6‐oxo‐heptanoate and ethyl 2, 5‐dibenzoyl‐pentanoate. Competing with this condensation aldol type cyclisations occur.