Air-stable aryl derivatives of pentafluoroorthotellurate.

We report on two different sets of air-stable derivatives of pentafluoroorthotellurate containing fluorinated and non-fluorinated aryl groups. The acid cis -PhTeF 4 OH was obtained in gram scale and further transformed to Ag[ cis -PhTeF 4 O], which was used as a cis -PhTeF 4 O transfer reagent to obtain [PPh 4 ][ cis -PhTeF 4 O]. Furthermore, the synthesis of trans -(C 6 F 5 ) 2 TeF 3 OH was achieved by a selective hydrolysis of trans -(C 6 F 5 ) 2 TeF 4 in the presence of KF and subsequent protonation by a HF. Quantum-chemical calculations show a higher acidity and robustness against fluoride abstraction for trans -(C 6 F 5 ) 2 TeF 3 OH compared to cis -PhTeF 4 OH.