https://doi.org/10.1351/goldbook.Q05012
Methylidenecyclohexadienones and dimethylidenecyclohexadienes, formally derived from ![Not defined](/img/inline/Q05012.png)
quinones
by replacement of one or both of the quinone oxygens by methylidene groups. (The diradical, triplet state
of quinodimethanes can also be called o- or p-xylylenes). ![Not defined](/img/inline/Q05012.png)