Synthesis and Structure of Telluroamides and Selenoamides. The First Crystallographic Study of Telluroamides

The reaction between bis(trialkyltin) chalcogenides and trimethylaluminum 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 esters) converts them to carbon−chalcogen double-bond (C E) compounds. Using this procedure, we have successfully synthesized several telluro- and selenocarbonyl compounds. The first successful synthesis of an isolable, crystalline telluroformamide, 4-(telluroformyl)morpholine ( 3c, C 5 H 9 NOTe), and its crystal structure are reported. Also, the syntheses and crystal structures of a γ-tellurolactam, 1-methyl-2-telluroxopyrroline ( 3d, C 5 H 9 NTe), and two selenoamides, N, N -diphenylselenoformamide ( 3a, C 13 H 11 NSe) and N -methyl- N -(4-nitrophenyl) selenoformamide ( 3b, C 8 H 8 N 2 O 2 Se) are described.