Butyltellurenyl bromide

Concurrently, the butyltellurenyl bromide was obtained by the addition of a solution of bromine (0.16 g, 2.0 mmol) in benzene ( 10 mL) to the solution of dibutylditelluride (0.738 g, 2.0 mmol) in hexane cooled at 0°C under a nitrogen atmosphere. The mixture was stirred at 0°C for 10 min, then LiCl (0.196 g, 4.2 mmol) was added, the dark solution turned clear red and stirring was continued until LiCl was dissolved (10 min). The resulting solution was transferred to the flask containing the vinyl alane. The reaction was stirred for 2 h at room temperature and then a mixture of ice and water ( 60 mL) was added. The solids were filtered and the products extracted with hexane (3X70 mL) and ethyl acetate... 

Mono- and bis-tellurenyl ferrocenes are achieved respectively by treatment of lithiated fer-rocenes with butyltellurenyl bromide (route a) or with dibutyl ditelluride (route b). Mono tellurenyl ferrocene is also obtained in a two-step procedure by treating lithiated ferrocene with Te to give the ditelluride followed by reductive alkylation (route c). - ... 

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