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AROMATIC RING [1 record]

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Record 1 2001-01-18

English

Subject field(s)
  • Chemistry
  • Biological Sciences
DEF

The resonance-stabilized ring characteristic of aromatic organic compounds.

CONT

Most aromatic rings are planar six-membered rings (e.g., benzene or pyridine) or planar five-membered rings containing a hetero atom with an unshared electron pair (e.g,, furan or pyrrole). Although aromatic rings are unsaturated, they do not undergo the addition reactions characteristic of alkenes; instead, aromatic compounds are characterized by substitution reactions. Many organic compounds, such as naphthalene and purine, contain several aromatic rings fused together.

OBS

It appears that human, because of the course of evolution, do not have biochemical ability to synthesize the benzene ring. As a result, phenylalanine and tryptophan derivatives are essential in the human diet.

French

Domaine(s)
  • Chimie
  • Sciences biologiques
CONT

La famille [...] des aminoacides non polaires [...] contient cinq aminoacides ayant une chaîne hydrocarbonée aliphatique: alanine, leucine, isoleucine, valine et proline, deux possédant des noyaux aromatiques : phénylalanine et tryptophane, et un contenant du soufre : la méthionine. Tous ces aminoacides sont moins solubles dans l'eau que ne le sont les aminoacides polaires.

Spanish

Campo(s) temático(s)
  • Química
  • Ciencias biológicas
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