Process

• Hydroquinone can undergo mild oxidation to convert to the compound parabenzoquinone, C6H4O2, often called p-quinone or simply quinone.
• Reduction of quinone reverses this reaction back to hydroquinone.
• Some biochemical compounds in nature have this sort of hydroquinone or quinone section in their structures, such as Coenzyme Q, and can undergo similar redox interconversions.

Technology

• The reaction of hematite with quinones and the quinone moieties of larger molecules may be an important factor in limiting the rate of reductive dissolution, especially by iron-reducing bacteria.

• The hydroquinone-modified derivatives had much higher reducing performance when compared to non modified leonardite humic acid.

Application

• Hydroquinone is used as a topical application in skin whitening to reduce the color of skin as it does not have the same predisposition to cause dermatitis as Metol does.
• It is also used as a raw material of herbicides, rubber antioxidants and dye stuffs.
• It is a major component in most photographic developers where, with the compound Metol, it reduces silver halides to elemental silver.

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