From Phenyl Trimethylsilyl Tellurium and Acyl Chlorides

From Phenyl Trimethylsilyl Tellurium and Acyl Chlorides 

When phenyl trimethylsilyl tellurium and acyl chlorides are mixed in dry tetrahydrofuran under an argon atmosphere at 20°, phenyl tellurocarboxylates are obtained in almost quantitative yields. The tellurobenzoates are relatively stable and can be purified by recrystallization or column chromatography. The telluroalkanoates are too unstable for isolation in pure form.  

Phenyl Tellurobcnzoate A stirred solution of 1.42 g (10.1 mmol) benzoyl chloride in 7 Qml dry tetrahydrofuran and 2.1 ml (10.9 mmol) phenyl trimethylsilyl tellurium are mixed under an atmosphere of argon. The mixture is stirred at 20° for 3 h and then concentrated under reduced pressure. The residue is recrystallized from pentane to give yellow needles yield 87% m.p. 72°. 

Examples of compounds similarly prepared are phenyl telluroacetate - 

---