The coupling reaction of aldehyde leading to pinacols was carried out by using disodium telluride and diaryl telluride in presence of potassium hydroxide in methanol solution at room temperature. These tellurides catalyze the pinacolization reactions to form a-glycols in considerable yield. All the products have been identified by comparison of their properties with those of authentic samples. It has been observed that disodium telluride is better catalyst as compare to diaryl tellurides and bis (p-methoxyphenyl) telluride is better catalyst as compared to bis(hydroxyaryl) tellurides.
Tellurium, Pinacolization, Aromatic aldehydes