Spaltung sperriger Diarylditelluride mit Brom und Iod[1]; Strukturbestimmung an Et4N+ 2,4,6‐(i‐C3H7)3C6H2TeI−2

Cleavage of Bulky Diaryl Ditellurides with Bromine and Iodine; Crystal Structure of Et4N+ 2,4,6‐(i‐C3H7)3C6H2TeI−2 Bis(2,4,6‐triisopropylphenyl) ditelluride (1a), obtained from 2,4,6‐triisopropylphenylmagnesium bromide with tellurium followed by oxidation with oxygen, and bis(2,4,6‐tri‐tert‐butylphenyl) ditelluride (1b) react with equimolar amounts of bromine and iodine to provide new monomeric arenetellurenyl halides 2,4,6‐R3C6H2TeX (2a, b, 3a, b: R = i‐C3H7, t‐C4H9; X = Br, I). Both tellurenyl iodides are thermally more stable than the corresponding bromides. Green 2,4,6‐(i‐C3H7)3C6H2TeI (3a) reacts with Et4N+I− to give the stable, red adduct Et4N+ 2,4,6‐(i‐C3H7)3C6H2TeI−2 (4a). An X‐ray crystal structure determination of 4a revealed a T‐shaped structure of the hypervalent aryldiiodotellurate(II) anion. Iodide‐ion transfer between aryldiiodotellurate(II) and arenetellurenyl iodide is a fast process (1H‐NMR time scale). 125Te‐NMR data of this anion and of tellurenyl halides are compared with those of the ditellurides and of lithium benzenetellurolates (LiTeR·(THF)x).