What is DDQ

Some information https://en.m.wikipedia.org/wiki/2,3-Dichloro-5,6-dicyano-1,4-benzoquinone

DDQ is reduced to the corresponding phenol and this is a bit acidic so you wash it away with NaHCO3. You can use many solvents, dioxane is not special.

Much appreciate everyone. It sounds like hydroquinone is insoluble in dioxane which facilitates the reaction.