Wiktionary
cyclohexenone
n. (context organic compound English) Any unsaturated alicyclic ketone derived from cyclohexene
Wikipedia
Cyclohexenone
Cyclohexenone is an organic compound which is a versatile intermediate used in the synthesis of a variety of chemical products such as pharmaceuticals and fragrances. It is a clear colorless liquid in pure state but a commercially available product is mostly yellowish liquid.
Industrially, cyclohexenone is prepared from phenol by Birch reduction.
Cyclohexenone is a ketone, or more precisely an enone. Common reactions include nucleophilic conjugate addition with organocopper reagents, Michael reactions and Robinson annulations.