Cyclohexanehexone, also known as hexaketocyclohexane and triquinoyl, is an organic compound with formula C6O6, the sixfold ketone of cyclohexane. It is an oxide of carbon (an oxocarbon), a hexamer of carbon monoxide.
The compound is expected to be highly unstable, even less stable than the cyclohexanehexathione analog, and as of 1999 had only been observed as an ionized fragment during mass spectrometry studies.