Thallium halides reactions with

Thallium(III), particularly as the trifluoroacetate salt, is also a reactive electrophilic metalating species, and a variety of synthetic schemes based on arylthallium intermediates have been devised. Arylthallium compounds are converted to chlorides or bromides by reaction with the appropriate cupric halide. Reaction with potassium iodide gives aryl iodides. Fluorides are prepared by successive treatment with potassium fluoride and... 

Thallium(i) salts have long been used in reactions with organic and organometallic halide complexes as a means of activating the halide by removal as insoluble T1X. However, the thallium ions proved not to be innocent bystanders, and numerous examples were reported in COMC (1995) where the metal-bound thallium complexes were formed. Deliberate reactions of thallium(i) and thallium(m) salts with metal carbonyl anions have yielded a variety of complexes of the form T1 MLJ3. In the past decade, new examples of metal carbonyl derivatives of thallium have been prepared (see Table 2). In addition, the propensity for Tl+ to form adducts with 16-electron noble metal complexes has been exploited. 

Thallium burns in fluorine with incandescence. Reactions with other halogens form halides. Thallium combines with several elements forming binary compounds. 

B. Reaction of a Thallium Metal Carbonylate with a Silicon Halide. .. 11... 

Cyanamides are pseudo-halide nitrogen ligands that are readily coordinated to metals. A novel compound is 2-cyanaminofluoren-9-one (HL4)24. Its thallium salt T1+(L4)-(Scheme 7) is useful as a transmetallating agent in a reaction with trimethyltin chloride to produce the corresponding tin cyanamide complex [SnMe3L4] (Scheme 8). 

Acyl cyanides ° can be prepared by treatment of acyl halides with copper cyanide. The mechanism could be free-radical or nucleophilic substitution. The reaction has also been accomplished with thallium(l) cyanide,with Mc3SiCN and an SnCl4 catalyst,and with BuaSnCN, " " but these reagents are successful only when R = aryl or tertiary alkyl. KCN has also been used, along with ultrasound, ° as has NaCN with phase-transfer catalysts. ... 

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