Synthesis and characterization of 2,4-disubstituted-5-imino- Δ2-1,3,4-telluradiazolines and 1,4-dihydro-2-imino-3-telluraquinolines

Abstract

2,4-Disubstituted-5-imino- Δ 2-1,3,4,-telluradiazolines were isolated together with α-tellurocyanatobenzaldehyde arylhydrazones when potassium tellurocyanate was reacted with hydrazidoyl bromides in DMSO solution. N-Acetyl derivatives were prepared by reaction of 5-imino- δ 2-1,3,4-teluradiazolines with acetic anhydride. Reaction of 2-amino-benzyl iodide with KTeCN afforded the novel heterocyclic tellurium compound, 1,4-dihydro-2-imino-3-telluraquinoline, which, on treatment with acetic anhydride, gave the acetyl derivative. The acetyl derivative was hydrolysed with HCl/H 2O to afford 1- N-acetyl-4-hydro-3-telluraquinolin-2-one.