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"DDQ" redirects here. DDQ
RTQ

RTQ is an Australian television station broadcasting in regional Queensland in Australia. The network was owned by Star Television, before being purchased by the WIN Corporation on October 5, 1988....
 is also the former callsign of a TV station in Toowoomba, Queensland, Australia.


Quinones are "compounds having a fully conjugated cyclic dione
Diketone

A diketone is a molecule containing two ketone groups. The simpliest diketone is diacetyl, also known as 2,3-butanedione. Diacetyl, acetylacetone, and hexane-2,5-dione are examples of 1,2-, 1,3-, and 1,4-diketones, respectively....
 structure, such as that of benzoquinones, derived from aromatic compounds by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double bonds (polycyclic and heterocyclic analogues are included)."

Benzoquinone, sometimes referred to simply as "quinone", is one of the two isomers of cyclohexadienedione.






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"DDQ" redirects here. DDQ
RTQ

RTQ is an Australian television station broadcasting in regional Queensland in Australia. The network was owned by Star Television, before being purchased by the WIN Corporation on October 5, 1988....
 is also the former callsign of a TV station in Toowoomba, Queensland, Australia.


Quinones are "compounds having a fully conjugated cyclic dione
Diketone

A diketone is a molecule containing two ketone groups. The simpliest diketone is diacetyl, also known as 2,3-butanedione. Diacetyl, acetylacetone, and hexane-2,5-dione are examples of 1,2-, 1,3-, and 1,4-diketones, respectively....
 structure, such as that of benzoquinones, derived from aromatic compounds by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double bonds (polycyclic and heterocyclic analogues are included)."

Benzoquinone, sometimes referred to simply as "quinone", is one of the two isomers of cyclohexadienedione. These compounds have the molecular formula C6H4O2. Orthobenzoquinone
1,2-Benzoquinone

1,2-Benzoquinone, also cyclohexa-3,5-diene-1,2-dione, is a ketone, with formula C6H4O2. It is one of the two isomers of quinone, the other being 1,4-Benzoquinone....
 is the 1,2-dione, whereas parabenzoquinone
1,4-Benzoquinone

1,4-Benzoquinone is the chemical compound with the chemical formula C6H4O2. In pure state, it forms bright yellow crystals with characteristic irritating odor, resembling that of chlorine; impure samples are often dark colored due to the presence of quinhydrone ....
 is the 1,4-dione. Orthobenzoquinone is the oxidized form of catechol (1,2-dihydroxybenzene), while parabenzoquinone is the oxidized form of hydroquinone
Hydroquinone

Hydroquinone, also benzene-1,4-diol or quinol, is an aromatic organic compound which is a type of Phenols, having the chemical formula C6H42....
 (quinol). An acidic potassium iodide
Potassium iodide

Potassium iodide is an inorganic compound with chemical formula potassiumiodide. This colorless salt is the most commercially significant iodide compound, with approximately 37,000 tons produced in 1985....
 solution reduces a solution of benzoquinone to hydroquinone, which is oxidized back with a solution of silver nitrate
Silver nitrate

Silver nitrate, also known as lunar caustic, is a soluble chemical compound with chemical formula silverNitrogenOxygen3. This compound is a versatile precursor to many other silver compounds, such as those used in photography....
.

Some examples of quinones

Biochemistry

Quinones are common constituents of biologically relevant molecules (e.g. Vitamin K1
Vitamin K

Vitamin K denotes a group of lipophilic, hydrophobic vitamins that are needed for the posttranslational modification of certain proteins, mostly required for blood coagulation....
 is phylloquinone
Phylloquinone

Phylloquinone is a polycyclic aromatic ketone, based on 2-methyl-1,4-naphthoquinone, with a 3-phytane substituent. It is often called vitamin K1 or phytonadione....
). Others serve as electron acceptors in electron transport chains such as those in Photosystem
Photosystem

Photosystems are protein complexes involved in photosynthesis. They are found in the thylakoid membranes of plants, algae and cyanobacteria , or in the cytoplasmic membrane of photosynthetic bacteria....
s I & II of photosynthesis
Photosynthesis

File:Seawifs global biosphere.jpgPhotosynthesis is a metabolic pathway that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight....
, and aerobic respiration. A natural example of the oxidation of hydroquinone to quinone is in the spray of bombardier beetle
Bombardier beetle

Bombardier Beetles are ground beetles in the Tribe s Brachinini, Paussini, Ozaenini, or Metriini?more than 500 species altogether?that are most notable for the defense mechanism that gives them their name: When disturbed, the beetle ejects a noxious chemical spray in a rapid burst of pulses from special glands in its abdomen....
s; hydroquinone is reacted with hydrogen peroxide
Hydrogen peroxide

Hydrogen peroxide is a very pale blue liquid which appears colorless in a dilute solution, slightly more viscous than water. It is a weak acid....
 to produce a fiery blast of steam, a strong deterrent in the animal world. Quinones can be partially reduced to quinols.

Oxidizing agents

Benzoquinone is used in organic chemistry
Organic chemistry

Organic chemistry is a discipline within chemistry which involves the science study of the structure, properties, composition, chemical reaction, and preparation of chemical compounds that contain carbon....
 as an oxidizing agent. Stronger quinone oxidising agents exist; for instance: 2,3,5,6-tetrachloro-parabenzoquinone (also known as p-chloranil) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (also known as DDQ).

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