From Telluraxanthenes

Refluxing telluraxanthenes with triphenylcarbenium perchlorate in trifluoroacetic acid produced telluraxanthylium perchlorates.  

9-(4-Methylphenyl)-telluraxanthylium Perchlorate A mixture of 1.54 g (5 mmol) of 9-(4-methylphenyl)-telluraxanthcnc and 1.88 g (5.5 mmol) of triphenylcarbenium perchlorate in 30 ml of trifluoroacetic acid is heated under reflux for 30 min. The cooled mixture is diluted with 50 ml of absolute diethyl ether, and the precipitate is filtered, washed with three 50 ml portions of absolute diethyl ether, and dried in air yield 2.0 g (100%) m.p. 160° (dec. explosion). 

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Telluraxanthene dihalides were also obtained from telluraxanthene and copper(II) chloride or copper(II) bromide in aqueous acetone3. 

A telluronium salt could not be obtained from telluraxanthene and methyl iodide. However, the telluronium perchlorate was formed in high yields when silver perchlorate was added to the reaction mixture3. 

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