Preparative and Spectral Studies on the Products of Diaryltellurium (IV) Dihalide Hydrolysis

摘要

Hydrolysis of bis (hydroxyaryl) tellurium (IV) dihalide appears to proceed in a stepwise manner. In neutral medium products of the type R2Te (OH)X (X = halide ion, R = 4-hydroxyphenyl and 3-methyl-4-hydroxy-phenyl) have been isolated. Further hydrolysis does not occur appreciably. Alkali hydrolysis (with NaCH) yields R2Te (OH)2which on heating at 100#xB0;C or aging changes to R2TeO type species. Isolation of the intermediates in this case is not possible but they are indicated by pH-metric and conductometric titrations. Hydrolysis of these compounds follows the order Cl Br I and,o-cresol phenol. R2Te (OH)X, R2Te (OH)2and R2TeO type species thus isolated have been charac-terized by elemental analyses, IR,1H and mass spectral studies. Mechanisms for the hydrolysis is proposed.