Synthesis and structure of an intramolecularly coordinated diaryltelluronic acid and its dimethyl ester

The oxidation of the telluroxane cluster (8Me₂NC₁₀H₆Te)₆O₈(OH)₂ (4) or the diaryl ditelluride (8-Me₂NC₁₀H₆Te)(₂) (7) using H₂O₂ provided the diarylditelluronic acid [8-Me₂NC₁₀H₆Te(O)(OH)₂]₂(O) (6), which is the second member of this compound class and the first one to contain an intramolecularly coordinated substituent. Attempts at recrystallizing 6 from Methanol provided the partial ester [8-Me₂NC₁₀H₆Te(O)(OH)(OMe)]₂(O) (8). In addition structural motifs of known diaryltelluronic acids were compared using DFT calculations.