éther

Traductions

• anglais

  Date : 1983

  Définition

  A class of organic compounds characterized by the presence of an oxygen atom covalently bound between two carbon atoms. If the organic groups containing carbon are represented by the letter R, the generalized formula of an ether is ROR. Ethers are derived either by removing water from alcohols (dehydration) or by hydration of olefins by means of a catalyst.

  Note :

  Most common ethers are liquids, and some are extremely flammable. The most prominent one is diethyl ether, (C₂H₅)₂O, b.p. 34.6 °C (94 °F), a valuable anesthetic first used in surgery in 1842; it is also a useful solvent and extraction medium. The ethers of ethylene glycol form a well-known group of useful solvent and plasticizers. There are a few solid ethers of cellulose. The term "petroleum ether" for petroleum-derived naphtha is a misnomer.

  Terme :

  1. ether