The quinoid 2 forms a chemical equilibrium with the radical type dimer 3 ( 3-triphenylmethyl-6-diphenylmethylidene-1,4-cyclohexadiene ) .
The radical 2 forms a chemical equilibrium with the quinoid type dimer 3 ( 3-triphenylmethyl-6-diphenylmethylidene-1,4-cyclohexadiene ) .