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In chemistry, a quaternary compound is a compound consisting of exactly four chemical elements. In another use of the term in organic chemistry, a quaternary compound is or has a cation consisting of a central positively charged atom with four substituents, especially organic (alkyl and aryl) groups, discounting hydrogen atoms. The best-known quaternary compounds are quaternary ammonium salts, having a nitrogen atom at the centre. For example, in the following reaction, the nitrogen atom is said to be quaternized as it has gone from 3 to 4 substituents:

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  • En chimie, un composé quaternaire est un cation constitué d'un atome central de pnictogène chargé positivement, entouré de quatre substituants, en particulier des groupes organiques (alkyle, aryle), en ne comptant pas les atomes d'hydrogène. Les composés quaternaires les plus connus sous les ammoniums quaternaires, dont l'atome central est l'azote . Par exemple, dans la réaction ci-dessous, l'atome d'azote est dit « quaternisé » en passant de trois à quatre substituants : D'autres exemples incluent les sels de phosphonium (R4P+), les substitués (R4As+) tels que l'arsénobétaïne, ou certains supraconducteurs contenant de l'arsenic. Certains sels de (R4Sb+) et de (R4Bi+) ont aussi été décrits. (fr)
  • In chemistry, a quaternary compound is a compound consisting of exactly four chemical elements. In another use of the term in organic chemistry, a quaternary compound is or has a cation consisting of a central positively charged atom with four substituents, especially organic (alkyl and aryl) groups, discounting hydrogen atoms. The best-known quaternary compounds are quaternary ammonium salts, having a nitrogen atom at the centre. For example, in the following reaction, the nitrogen atom is said to be quaternized as it has gone from 3 to 4 substituents: Other examples include substituted phosphonium salts (R4P+), substituted arsonium salts (R4As+) like arsenobetaine, as well as some arsenic-containing superconductors. Substituted (R4Sb+) and (R4Bi+) have also been described. (en)
  • Em química, um composto quaternário é um íon que consiste numa carga positiva do átomo central com quatro substituintes, especialmente grupos orgânicos (alquila e arila), tirando os átomos de hidrogénio. Outros exemplos incluem os substituintes R4P+, R4As+ como , bem como alguns arsénios contendo supercondutores. Os substituintes R4Sb+ e R4Bi+ também têm sido descritos. (pt)
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  • Em química, um composto quaternário é um íon que consiste numa carga positiva do átomo central com quatro substituintes, especialmente grupos orgânicos (alquila e arila), tirando os átomos de hidrogénio. Outros exemplos incluem os substituintes R4P+, R4As+ como , bem como alguns arsénios contendo supercondutores. Os substituintes R4Sb+ e R4Bi+ também têm sido descritos. (pt)
  • In chemistry, a quaternary compound is a compound consisting of exactly four chemical elements. In another use of the term in organic chemistry, a quaternary compound is or has a cation consisting of a central positively charged atom with four substituents, especially organic (alkyl and aryl) groups, discounting hydrogen atoms. The best-known quaternary compounds are quaternary ammonium salts, having a nitrogen atom at the centre. For example, in the following reaction, the nitrogen atom is said to be quaternized as it has gone from 3 to 4 substituents: (en)
  • En chimie, un composé quaternaire est un cation constitué d'un atome central de pnictogène chargé positivement, entouré de quatre substituants, en particulier des groupes organiques (alkyle, aryle), en ne comptant pas les atomes d'hydrogène. Les composés quaternaires les plus connus sous les ammoniums quaternaires, dont l'atome central est l'azote . Par exemple, dans la réaction ci-dessous, l'atome d'azote est dit « quaternisé » en passant de trois à quatre substituants : (fr)
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  • Quaternary compound (en)
  • Composé quaternaire (fr)
  • Composto quaternário (pt)
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