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Structures of three kinds of amides: an organic amide (carboxamide), a sulfonamide, and a phosphoramide. In chemistry, the term amide (/ ˈ æ m aɪ d / or / ˈ æ m ɪ d / or / ˈ eɪ m aɪ d /) [1] [2] [3] is a compound with the functional group R n E(=O) x NR 2, where x is not zero, E is some element, and each R represents an organic group or hydrogen. [4]
The core −C(=O)−(N) of amides is called the amide group (specifically, carboxamide group). In the usual nomenclature, one adds the term "amide" to the stem of the parent acid's name. For instance, the amide derived from acetic acid is named acetamide (CH 3 CONH 2). IUPAC recommends ethanamide, but this and related formal names are rarely ...
[2] The alkali metal amides, MNH 2 (M = Li, Na, K) are commercially available. Sodium amide (also known as sodamide) is synthesized from sodium metal and ammonia with ferric nitrate catalyst. [3] [4] The sodium compound is white, but the presence of metallic iron turns the commercial material gray. 2 Na + 2 NH 3 → 2 NaNH 2 + H 2
Paris, Versailles Kingdom 843–1792 AD Frisia: Dorestad, Utrecht Tribal kingdom 600–734 AD Frisia (Upstalsboom League) Confederacy c. 1200–c. 1500 AD Flanders: Various Countship 862–1795 AD Frankish Empire: Tournai, Paris Kingdom/Empire 481–843 AD Holland: The Hague Countship 11th century–1795 AD Holy Roman Empire: No official Empire ...
The coat of arms of the league of Paris river merchants in the Middle Ages became the emblem of the city of Paris Commerce was a major source of the wealth and influence of Paris in the Middle Ages. Even before the Roman conquest of Gaul, the first inhabitants of the city, the Parisii , had traded with cities as far away as Spain and Eastern ...
Tabula Peutingeriana (section of a modern facsimile), top to bottom: Dalmatian coast, Adriatic Sea, southern Italy, Sicily, African Mediterranean coast. Tabula Peutingeriana (Latin for 'The Peutinger Map'), also referred to as Peutinger's Tabula, [1] Peutinger tables [2] or Peutinger Table, is an illustrated itinerarium (ancient Roman road map) showing the layout of the cursus publicus, the ...
Their trade network covered much of Europe, North Africa, the Middle East, Central Asia, and parts of India and China. Only a limited number of primary sources use the term, and it remains unclear whether they referred to a specific guild , to a clan , or generically to Jewish merchants in the trans- Eurasian trade network.
Azanide is the IUPAC-sanctioned name for the anion NH − 2. The term is obscure; derivatives of NH − 2 are almost invariably referred to as amides, [1] [2] [3] despite the fact that amide also refers to the organic functional group – C(=O)−NR 2. The anion NH − 2 is the conjugate base of ammonia, so it is formed by the self-ionization ...