Tartrates

Tartrate anion (without considering stereochemistry )

Tartrates are the salts and esters of tartaric acid . Of the tartrates, the potassium hydrogen tartrate ( tartar , potassium bitartrate), the tartar emetic and the seignette salt are particularly relevant. In addition to copper sulfate, potassium-sodium tartrate is a reagent in the Fehling's test for reducing sugars. Sodium rubidium tartrate played a central role in elucidating the absolute configuration of enantiomerically pure molecules.

Drugs with a basic functional group are used as tartrates, e.g. B. as the tartaric acid salt of zolpidem .

proof

Tartrate solution (left), tartrate solution after the addition of copper (II) hydroxide precipitate (middle, blue, cloudy) and after further addition of sodium hydroxide solution (blue, clear, right)

Tartrations can be detected by a colored complex formation reaction with copper (II) salts in an alkaline solution:

${\displaystyle \mathrm {2\ C_{4}H_{4}O_{6}^{2-}+Cu^{2+}+2\ OH^{-}\longrightarrow \ [Cu(C_{4}H_{3}O_{6})_{2}]^{4-}+2\ H_{2}O} }$

Tartrate ions, copper (II) ions and hydroxide ions react to form the deep blue appearing ditartratocuprate (II) complex and water

See also

• Tartar

Web links

Wiktionary: Tartrat  - explanations of meanings, word origins, synonyms, translations

Wikibooks: Practical course organic chemistry / acid residue anions  - learning and teaching materials