Isolable Phospha- and Arsaalumenes

摘要

The combination of (AlCp*)_4, a source of monomeric :AlCp* at elevated temperatures, with ~(Dip)TerPnPMe_3 (Pn = P, As), so-called pnicta-Wittig reagents, at 80 °C cleanly gives the pnictaalumenes ~(Dip)TerPnAlCp* with polarized Pn-Al double bonds and intramolecular stabilization through interactions of Al with a flanking aryl group of the terphenyl substituent on Pn. In contrast, using ~(Mes)TerPPMe_3, the reaction with 2 equiv of :AlCp~(3t) or :AlCp* afforded the three-membered 2π-aromatic ring systems ~(Mes)TerP(AlCp*)_2 (x = 3t, *).