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Catechol (/ ˈ k æ t ɪ tʃ ɒ l / or / ˈ k æ t ɪ k ɒ l /), also known as pyrocatechol or 1,2-dihydroxybenzene, is an organic compound with the molecular formula C 6 H 4 (OH) 2. It is the ortho isomer of the three isomeric benzenediols .
There are three structural isomers: 1,2-dihydroxybenzene (the ortho isomer) is commonly known as catechol, 1,3-dihydroxybenzene (the meta isomer) is commonly known as resorcinol, and 1,4-dihydroxybenzene (the para isomer) is commonly known as hydroquinone. [1]
1,2-Benzoquinone, also called ortho-benzoquinone, is an organic compound with formula C 6 H 4 O 2. It is one of the two isomers of quinone , the other being 1,4-benzoquinone . It is a red volatile solid that is soluble in water and ethyl ether .
Rhodia was a public company that was founded on January 1, 1998, [3] following the spin-off of the chemicals, fibers, and polymers activities of Rhône-Poulenc when it merged with the German company Hoechst. On June 25, 1998, Rhône-Poulenc sold 32.7% of its share in Rhodia's capital to the public. In 1999, Rhodia made two acquisitions:
In the petroleum refining and petrochemical industries, the initialism BTX refers to mixtures of benzene, toluene, and the three xylene isomers, all of which are aromatic hydrocarbons. The xylene isomers are distinguished by the designations ortho – (or o –), meta – (or m –), and para – (or p –) as indicated in the adjacent diagram.
Metabolism of levodopa by catechol-O-methyltransferase (COMT) and aromatic L-amino acid decarboxylase (AADC). COMT inhibitors prevent the conversion of levodopa to 3- O -methyldopa. A catechol- O -methyltransferase inhibitor ( COMT inhibitor ) is a drug that inhibits the enzyme catechol- O -methyltransferase .
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The catalytic cycle begins with the catechol oxidase in its native oxidized Cu(II)-Cu(II) state with a coordinated hydroxide ion bridging the two copper centers. As catechol enters the active site, a proton is abstracted from one of the alcohols. The catechol coordinates with a Cu(II) center in a monodentate fashion, displacing one of the ...