The convenient five-coordinate starting materials, Salen(′Bu)AlCl (Salen(′Bu) = N,N′-alkylene (or arylene) bis (3,5-di-tert-butyl-2-hydroxybenzylideneamine) (1-4) can be used in a wide range of reactions to form five-coordinate aluminum compounds. Herein, these reagents were used to produce new five-coordinate azides, LAlN3 (L = Salen(′Bu) (5), Salpen(′Bu) (6), and Salomphen(′Bu) (7)) through trimethylsilylhalide elimination. The decomposition of the azides produce first hydroxide (LAlOH (L = Salen(′Bu) (8)) and, subsequently in the presence of chlorotrimethylsilane, the siloxide compounds, LAlOSiMe3 (L = Salen(′Bu) (9), Salpen(′Bu) (10), and Salomphen(′Bu) (11)). Alkane elimination reactions may also be used to access this type of compound as evidenced by the formation of Salomphen(′Bu)AlOSiPh3 (12). Additionally, the first structurally characterized five-coordinate monomeric amide, Salcen(′Bu)AlN(SiMe3)2 (13), can prepared by a salt elimination utilizing Salcen(′Bu)AlCl (4). The compounds were characterized by spectroscopic methods (1H and 27Al NMR, MS, and IR) and, in the case of 2 (Salpen(′Bu)AlCl), 3 (Salomphen(′Bu)AlCl) 9, 11, 12, and 13, by X-ray analysis. Several of the compounds were explored as potential catalysts for the living polymerization of propylene oxide.
|Number of pages||6|
|State||Published - Dec 17 2001|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry