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Salt metathesis is a common technique for exchanging counterions. The choice of reactants is guided by a solubility chart or lattice energy. HSAB theory can also be used to predict the products of a metathesis reaction. Salt metathesis is often employed to obtain salts that are soluble in organic solvents.
Tetraethylammonium (TEA) is a quaternary ammonium cation with the chemical formula [Et 4 N] +, consisting of four ethyl groups (−C 2 H 5, denoted Et) attached to a central nitrogen atom. It is a counterion used in the research laboratory to prepare lipophilic salts of inorganic anions.
These complexes have the formula [M(μ-PR 2)L n] 2. One example is [Fe(μ-PPh 2)(CO) 3] 2. Phosphido ligands are often installed by salt metathesis reactions. Sources of R 2 P + and R 2 P − are provided by phosphorus halides and alkali metal phosphides respectively. Illustrative of the use of R 2 PCl-like reagents is the synthesis of a diiron ...
Although this reaction is suitable for the common halides, tetramethylammonium salts with more complex anions may be prepared by salt metathesis reactions, e.g. tetramethylammonium borohydride has been made from tetramethylammonium hydroxide as shown: [8] Me 4 N + [OH] − + Na + [BH 4] − → Me 4 N + [BH 4] − + Na + + HO −
These arise from the salt metathesis reactions of sodium cyclopentadienide and tantalum pentachloride. An example of this is the first transition metal trihydride, Cp 2 TaH 3. More soluble and better developed are derivatives of pentamethylcyclopentadiene such as Cp*TaCl 4, Cp* 2 TaCl 2, and Cp* 2 TaH 3. [4] Tantalum Alkylidene Olefin Metathesis
Tetrabutylammonium bromide (TBAB) is a quaternary ammonium salt with a bromide commonly used as a phase transfer catalyst. [4] It is used to prepare many other tetrabutylammonium salts by salt metathesis reactions. The anhydrous form is a white solid. [2]
Most of this article is about the homogeneous (one-phase) reaction of preformed organolithium compounds: R−Li + R′−X → R−X + R′−Li. Butyllithium is commonly used. Gilman and Wittig independently discovered this method in the late 1930s. [1] It is not a salt metathesis reaction, as no salt is produced.
Metathesis (linguistics), alteration of the order of phonemes within a word Quantitative metathesis , exchange of long and short roles, without changing order of vowel sounds Chemical change in which a pair of molecules exchange electronic patterns of bonding