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IUPAC Nomenclature Home Page

IUPAC Nomenclature Home Page
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Nomenclature TD module C22 (ch. Organique) DEUG SV Annie PRAUD-TABARIES 1998-99 Dans les débuts de la chimie organique, lorsque le nombre de composés qu'elle avait recensés était encore restreint, ceux-ci recevaient des noms particuliers, rappelant souvent leur origine ("menthol" retiré de l'essence de menthe…). Puis le nombre des composés organiques augmentant très rapidement, il a fallu instituer une nomenclature systématique, c'est à dire fixer des règles assurant un langage commun entre tous les chimistes. Ces règles permettent d'associer à chaque formule développée un nom qui ne peut appartenir qu'à elle et, inversement, d'établir sans ambiguité à partir d'un nom la structure du composé qu'il désigne. Ces règles sont établies par un organisme international, l'UICPA (Union International de Chimie Pure et Appliquée, souvent désigné par son terme anglais IUPAC). Principe général : Les alcanes sont des hydrocarbures saturés. Tableau 1 : Nom des alcanes à chaîne linéaire CnH2n+2 Règle IUPAC n° 1. Ex.

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couracidami 1. Acides aminés 1.1 Caractéristiques des acides aminés Les acides alpha-aminés Les différents radicaux R des chaînes latérales Les acides aminés naturels sont au nombre de 20. Les chaînes latérales sont souvent classées selon leur polarité et leur charge électrique à pH 7 : chargées positivement à pH 7 (l'acide aminé est aussi qualifié de basique) chargées négativement à pH 7 (l'acide aminé est qualifié d'acide) non chargées à pH 7 mais polaire non chargées à pH 7 mais apolaire Les acides aminés chargé électriquement à pH 7 ou non chargés mais polaires sont situés à la surface des protéines, c'est à dire à l'interface entre la macromolécule et le milieu aqueux dans lequel elle baigne. La nature de la chaîne latérale R influence quatre paramètres importants : l'encombrement stérique (important dans la structure des protéines)la valeur du pIle caractère polaire ou apolaire de la moléculela réactivité du résidu dans le site catalytique des enzymes. Les propriétés de quelques radicaux R 2. 3.

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