Tellurium isopropoxide

The alcoholysis reactions of tellurium isopropoxide with primary, secondary and tertiary alcohols readily yielded the corresponding tetra-alkoxides ... 

Hodgson, S. N. B. and Weng L., Preparation of tellurite thin films from Tellurium isopropoxide precursor by sol-gel processing, J. Non-Cryst. Solids, 276,195-200 (2000). 

Tellurium Tetra[isopropoxide]3 4 10 g (37 mmol) of tellurium tetrachloride are dissolved in 20 ml of isopropanol and 3.4 g (148 mmol) of sodium are added to a further 50 ml of isopropanol. When all the sodium has reacted, the alkoxide solution is added dropwise to the ice-cooled tellurium tetrachloride solution. When the exothermic reaction has subsided, the mixture is diluted with benzene, heated under reflux for 1 h, and the solvent is distilled off. The residue is kept under reduced pressure at 20° to completely remove all volatile substances and the resultant residue is fractionally distilled under vacuum yield 6.5 g (50%), b.p. 76°/0.5 torr. 

When tellurium tetraisopropoxide was treated with an equimolar amount of a diol, two isopropoxide groups were replaced. Reactions of two moles of a diol per mole of tellurium tetraisopropoxide, resulted in replacement of all four isopropoxide groups2. 

Selenium and tellurium alkoxides are also highly volatile and tend to be monomeric. For example, ethoxo-, -butoxo-, and isopropoxo-derivatives of selenium have been volatilized at 76°C/10.0, 110°C77.0, and 88°C/4.5mm pressures, respectively. Similarly tellurium tetramethoxide, ethoxide, -butoxide, and isopropoxide distilled at 115°C/9.0, 107°C/5.0, 150°C/0.8, and 76°C/0.5mm pressure, respectively. 

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