SYNTHESIS AND CHARACTERIZATION OF BSTITUTED-5-IMINO-DELTA(2)-1,3,4-TELLURADIAZOLINES AND 1,4-DIHYDRO-2-IMINO-3-TELLURAQUINOLINES

bstituted-5-imino-Delta(2)-1,3,4-telluradiazolines were isolated toget her with alpha-tellurocyanatobenzaldehyde arylhydrazones when potassiu m tellurocyanate was reacted with hydrazidoyl bromides in DMSO solutio n. N-Acetyl derivatives were prepared by reaction of 5-imino-Delta(2)- 1,3,4-telluradiazolines with acetic anhydride. Reaction of 2-amino-ben zyl iodide with KTeCN afforded the novel heterocyclic tellurium compou nd 1,4-dihydro-2-imino-3-telluraquinoline, which, on treatment with ac etic anhydride, gave the acetyl derivative. The acetyl derivative was hydrolysed with HCl/H2O to afford 1-N-acetyl-4-hydro-3-telluraquinolin -2-one. Copyright (C) 1997 Elsevier Science Ltd.