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Salt metathesis is often employed to obtain salts that are soluble in organic solvents. Illustrative is the conversion of sodium perrhenate to the tetrabutylammonium salt: [2] NaReO 4 + N(C 4 H 9) 4 Cl → N(C 4 H 9) 4 [ReO 4] + NaCl. The tetrabutylammonium salt precipitates from the aqueous solution. It is soluble in dichloromethane.
Tropocoronand complexes with transition metals (Cu, Zn, Ni, Cd, Co, Rh, Fe, etc.) are synthesized by salt metathesis reactions.. Dihedral angle of [M(TC-m,n)] complex. Note that tropocoronand zinc complexes exhibit significantly larger dihedral angles relative to their Cu analogs, which is likely a result of the larger metal ionic radius.
The compounds are generally prepared by salt metathesis reactions of alkali-metal cyclopentadienyl compounds with transition metal chlorides. Sodium cyclopentadienide (NaCp) and lithium cyclopentadienide are commonly used. Trimethylsilylcyclopentadiene cyclopentadienylthallium (CpTl) are alternative sources. [1]
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 diphosphide: [14] Na 2 Fe 2 (CO) 8 + 2 Ph 2 PCl → Fe 2 (PPh 2) 2 (CO) 6 + 2 NaCl + 2 CO
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]
The [BAr F 4] − anion with four fluorinated aryl groups distributed tetrahedrally about a central boron atom. Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate is an anion with chemical formula [{3,5-(CF 3) 2 C 6 H 3} 4 B] −, which is commonly abbreviated as [BAr F 4] −, indicating the presence of fluorinated aryl (Ar F) groups.
The resulting lithium indenide can be used to prepare indenyl complexes by salt metathesis reactions of metal halides. [3] When the metal halide is easily reduced, the trimethylstannylindenyl can be used as a source of indenyl anion: Me 3 SnC 9 H 7 + TiCl 4 → Me 3 SnCl + C 9 H 7 TiCl 3
The low solubility of KClO 3 in water causes the salt to conveniently isolate itself from the reaction mixture by simply precipitating out of solution. Potassium chlorate can be produced in small amounts by disproportionation in a sodium hypochlorite solution followed by metathesis reaction with potassium chloride: [7] 3 NaOCl → 2 NaCl + NaClO 3
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