Para-benzoquinone has a sharp, acrid, chlorine-like pungent odor that is highly irritating to the eyes and respiratory tract. It is not a perfumery material — it is a toxic, sensitizing industrial chemical with no accepted fragrance use.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 127.
Yellowish monoclinic crystals.
Almost insoluble in water, soluble in oils and alcohol.
Penetrating chlorine-iodine-like odor, pungent, medicinal. The vapors are irritating to human mucous membranes and eyes.
Probably not used as such in perfumes, but is occasionally mentioned as the prototype for quinone-like odor.
Produced from aniline by oxidation with dichromate, or by oxidation of hydroquinone.