anhydride

Domaine: chimie
Date: 1995

Définition :

Mélange formé par élimination d'eau, généralement à partir d'un acide.

Note :

Exemple : anhydride acétique utilisé pour la transformation de la cellulose en acétate de cellulose.

Terme :

anhydride n. m.

Traductions

anglais
Date : 1995
Définition

A compound formed by removing two atoms of hydrogen and one atom of oxygen from another compound, e.g., sulfur trioxide (SO₃) is the anhydride of sulfuric acid (H₂SO₄), and carbon dioxide is the anhydride of carbonic acid. In organic chemistry, phthalic anhydride C₆H₄(CO)₂O, is formed from phthalic acid, C₆H₄(CO₂H)₂, by the elimination of one water molecule.

Anhydride of a substance is that which when chemically combined with water, gives the substance; e.g. sulphur trioxide SO₃ is the anhydride of sulphuric acid H₂SO₄.

Notes :

"Anhydride" should not be confused with "anhydrous".

Amino acids can be considered as anhydrides of proteins, from which they are formed by hydrolysis.

Terme :
1. anhydride