Bis[tris(trimethylsilyl)methyl]diselenid: Ein ungewöhnliches Dichalkogenid mit sterisch erzwungener trans‐C2h‐Konformation

Bis[tris(trimethylsilyl)methyl] Diselenide: An Unusual Diselenide with Sterically Enforced trans‐C2h Conformation Deselenation of bis[tris(trimethylsilyl)methyl] triselenide (1) with copper occurs with formation of bis[tris(trimethylsilyl)‐methyl] diselenide (2) and minor amounts of 3,3,5,5‐tetrakis(trimethylsilyl)‐1,2,4‐triselenolane (3). The structures of 2 and 3 have been studied by multinuclear NMR spectroscopy and by X‐ray crystallography. The CSeSeC moiety of 2 adopts an unusual antiperiplanar conformation. Cleavage of the Se  Se bond by iodine providing iodo[tris(trimethylsilyl)‐methyl]selane (5) is complete with 2, but reversible with 1.