Synthesis, Structural Studies and Reactivity of Monomeric Organo Aluminum and Gallium Amides, Hydrogensulfides and Hydroxides Using N-Heterocyclic Carbene: Precursors for Heterobimetallic Systems

Abstract

V volume vst very strong w weak Z number of molecules in the unit cell for stabilization of low coordination numbers of 3 on such electropositive elements as Mg 2+ in L'MgMe [36] and Fe 2+ in L'FeCl. [28] Their other advantage is the possibility to stabilize such unique species as the first monomeric LAl containing aluminum in the rare oxidation state +I, [27] the first stable Ge 2+ hydride LGeH, [37] and the first structurally characterized metal hydroselenides of LAl(SeH) 2 and a Se bridged species [LAl(SeH)] 2 Se. [26] Recently, H. W. Roesky et al. reported on the preparation of the first stable aluminum congener of boronic Recently, H. W. Roesky et al. have successfully synthetized several unique molecular hydroxides based e.g. on silicon ((2,6-iPrC 6 H 3 )(SiMe 3 )NSi(OH) 3 , and [(Me 3 Si) 2 CHSi(µ-O)(OH)] 3), [107,108] aluminum (LAl(OH) 2 , and [LAl(OH)] 2 O) [38,109] or tin [(Me 3 Si) 3 CSn(µ-O)(OH)] 3 [110] (Figure 4). Aluminum hydroxides and aluminoxanes play an important role in this field due to the application as cocatalysts, and numerous examples of these species have 2 4 KI, H 2 NH 3 (l)/toluene Ar = Scheme 2: Synthesis of LAl(OH) 2 and [LAl(OH)] 2 O in the two phase system liquid ammonia/toluene.