Arylthallium bistrifluoroacetates

Diaryl sulfones. Arylthallium bistrifluoroacetates can be converted into diary) sulfones by reaction with an aqueous solution of sodium benzenesultinate and copper(II) sulfate (4 1) under mild conditions. The copper salt is essential. 

Aryl fluorides, 149 Arylpenta-2,4-dienoates, 161 a-Arylpropionic acids, 314 Arylsulfonylalkynes, 7 Arylthallium bistrifluoroacetates, 462 a-Atlantone, 514 Atiolactic acid methyl ether, 290 Aucubin, 73... 

A very large number of other arylthallium bistrifluoroacetates have been obtained by the direct thallation of aromatic compounds 40, 168,169,170, 203) (see Section VIII, B). 

However, aryl cyanides are more directly obtained by reaction of the arylthallium compound with various copper cyanides. Different reaction systems have been reported, such as CuCN or Cu(CN)2 in acetonitrile or pyridine with arylthallium acetate perchlorate monohydrates. Other systems involve the arylthallium bistrifluoroacetate with CuCN in acetonitrileor in DMF. With these systems, a number of aryl cyanides (114), heteroaryl cyanides (115) 25,126 indolyl cyanides (116) and (117)124 148 have been prepared. 

Phenols arylboronic acids. Treatment of arylthallium bistrifluoroacetates with diborane in THF leads to an intermediate, possibly ArBHj, that is converted into arylboronic acids on treatment with water or into a phenol on treatment with alkaline hydrogen peroxide. Treatment of the intermediates with silver nitrate fails to produce biaryls. ... 

Arylthallium(III) bistrifluoroacetates (2). These substances can be prepared in high yield by replacement of a trimethylsilyl group (c/. 4, 282-283) ... 

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