Tungsten Tellurolates

Bromomagnesium arenetellurolates and halotungsten complexes react in tetrahydrofuran to form mononuclear and dinuclear arenetellurolatotungsten compounds  

Halocarbonylmanganese and halocarbonylrhenium complexes reacted with diphenyl ditellurium. The resulting tellurium-containing coordination compounds had intact bridging diphenyl ditellurium moieties and no benzenetellurolate ligands. 

However, when decacarbonyldimanganese and diphenyl ditellurium were heated in p-xylene at 125° for 125 hours bis[tetracarbonylbenzentellurolatomanganese] was obtained.  

Octacarbonyldi- -benzenedinetel]urolatodimanganese 0.78 g (2 mmol) of deeacarbonyldimanganese, 1,4 g (2.5 mmol) of diphenyl ditellurium, and 10 ml of p-xylene are placed in a 150 ml thick-walled glass tube, which is then cooled to — 196°, evacuated, and sealed. The tube is then warmed to 20°, heated in a drying oven atl25°forl25h, cooled, and opened carefully. The reaction mixture is filtered, the red solid is washed with cold xylene, and recrystallized from benzene. 

The anionic complex, in which three dicarbonyl(cyclopentadienyl)manganese groups are connected by a bridging methanetellurolate ligand, was obtained from the corresponding t -tellurido compound and methyl lithium. 

---