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  2. Catechol - Wikipedia

    en.wikipedia.org/wiki/Catechol

    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 .

  3. Dihydroxybenzenes - Wikipedia

    en.wikipedia.org/wiki/Dihydroxybenzenes

    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]

  4. Arene substitution pattern - Wikipedia

    en.wikipedia.org/wiki/Arene_substitution_pattern

    Care must be taken to avoid cocrystallisation of the ortho isomer. [2] Many nitro compounds' ortho and para isomers have quite different boiling points. These isomers can often be separated by distillation. These separated isomers can be converted to diazonium salts and used to prepare other pure ortho or para compounds. [3]

  5. Ortho effect - Wikipedia

    en.wikipedia.org/wiki/Ortho_effect

    There are three main ortho effects in substituted benzene compounds: Steric hindrance forces cause substitution of a chemical group in the ortho position of benzoic acids become stronger acids. Steric inhibition of protonation caused by substitution of anilines to become weaker bases, compared to substitution of isomers in the meta and para ...

  6. 1,2-Benzoquinone - Wikipedia

    en.wikipedia.org/wiki/1,2-Benzoquinone

    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 .

  7. Catechol oxidase - Wikipedia

    en.wikipedia.org/wiki/Catechol_oxidase

    Catechol oxidase is a copper oxidase that contains a type 3 di-copper cofactor and catalyzes the oxidation of ortho-diphenols into ortho-quinones coupled with the ...

  8. Catechol-O-methyltransferase - Wikipedia

    en.wikipedia.org/wiki/Catechol-O-methyltransferase

    Norepinephrine degradation. Catechol-O-methyltransferase is shown in green boxes.[5] [6]Catechol-O-methyltransferase (COMT; EC 2.1.1.6) is one of several enzymes that degrade catecholamines (neurotransmitters such as dopamine, epinephrine, and norepinephrine), catecholestrogens, and various drugs and substances having a catechol structure. [7]

  9. Piperonal - Wikipedia

    en.wikipedia.org/wiki/Piperonal

    Piperonal can be prepared by the oxidative cleavage of isosafrole or by using a multistep sequence from catechol or 1,2-methylenedioxybenzene.Synthesis from the latter chemical is accomplished through a condensation reaction with glyoxylic acid followed by cleaving the resulting α-hydroxy acid with an oxidizing agent.