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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.
The distinctive feature of the Grignard reagents is their formation from the organic halide and magnesium metal. Most other group II organic compounds are generated by salt metathesis, which limits their accessibility. The formation of the Grignard reagents has received intense scrutiny.
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.
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
The salt also can be produced by salt metathesis reaction of ammonium salts with sodium perchlorate. This process exploits the relatively low solubility of NH 4 ClO 4, which is about 10% of that for sodium perchlorate. [6] AP crystallises as colorless rhombohedra.
The compound is prepared by the salt metathesis reaction of potassium iodide and potassium tetrachloroplatinate: [3] K 2 PtCl 4 + 4 KI → K 2 PtI 4 + 4 KCl. Potassium tetraiodoplatinate is a precursor to the anticancer drug cisplatin.
A familiar example is the sodium salt of iron tetracarbonylate (Na 2 Fe(CO) 4, Collman's reagent), which is used in organic synthesis. [ 47 ] The cationic hexacarbonyl salts of manganese , technetium and rhenium can be prepared from the carbonyl halides under carbon monoxide pressure by reaction with a Lewis acid .
Salt metathesis from tantalum(V) chloride is generally the most successful. Tantalum pentachloride, Ta 2 Cl 10, provides a convenient starting point. To avoid the generation of mixed chloride-ethoxide species, a base such as ammonia is usually added to trap liberated HCl: [8] 10 EtOH + Ta 2 Cl 10 + 10 NH 3 → Ta 2 (OEt) 10 + 10 NH 4 Cl