SYNTHESIS AND STRUCTURE OF TELLUROAMIDES AND SELENOAMIDES - THE FIRSTCRYSTALLOGRAPHIC STUDY OF TELLUROAMIDES

The reaction between bis(trialkyltin) chalcogenides and trimethylalumi num results in the formation of bis(dimethylaluminum) chalcogenides, ( Me(2)Al)(2)E, where E is S, Se, or Te. Reaction between the latter and carbonyl groups (but not carboxylic acids or eaters) converts them to carbon-chalcogen double-bond (C=E) compounds. Using this procedure, w e have successfully synthesized several telluro- and selenocarbonyl co mpounds. The first successful synthesis of an isolable, crystalline te lluroformamide, 4-(telluroformyl)morpholine (3c, C5H9-NOTe), and its c rystal structure are reported. Also, the syntheses and crystal structu res of a gamma-tellurolactam, 1-methyl-2-telluroxopyrroline (3d, C5H9N Te), and two selenoamides, N,N-diphenylselenoformamide (3a, C13H11NSe) and N-methyl-N-(4-nitrophenyl) selenoformamide (3b, C8H8N2O2Se) are d escribed.