ChemInform Abstract: A Novel Formation of 1,2-Diselenone in the Reaction of 1,2,3-Selenadiazoles.

ChemInform Abstract

1,2,3-Selenadiazole (I) is thermolyzed in the presence of 4-tert-butyl-1,2,3-selenadiazole (III), forming the 1,2-diselenone (IV). (IV) and the zwitterionic intermediate (II), generated from (I) by release of N2, produce the adducts (V) and (VI). Pyrolysis of (I) in the presence of the 1,2,3-thiadiazole (VII) yields a mixture of (VI) and (VIII). Norbornene (IXa) or norbornadiene (IXb) and (IV) give the adducts (X). The pentaselenepin (XII), obtained from (IV) and selenium (XI), undergoes photoreaction with (IXb) to yield (Xb).