No abstract

The reaction of (Cp*Al) 4 with organic azides offers an alternative synthetic route for the formation of iminoalanes with a low degree of oligomerization. This method was used to prepare the dimeric iminoalanes (Cp*AlNSi i Pr 3 ) 2 ( 1), (Cp*AlNSiPh 3 ) 2 (2), and (Cp*AlN-Si t Bu 3 ) 2 (3). The crystal structure of 3 was determined by X-ray diffraction study.

An almost ideal planar Al2N2 ring as a central unit and the lowest degree of oligomerization for the class of compounds is shown by the dimeric iminoalane 1, which is formed from (Cp*Al)4 and Me3SiN3. The fact that no heterocubane results is attributed to the steric demand of the Cp* and SiMe3 groups.

Ein nahezu ideal planarer AI2N2‐Ring als zentrale Einheit und den niedrigsten Oligomerisationsgrad der Verbindungsklasse weist das dimere Iminoalan 1 auf, das aus (Cp*Al)4 und Me3SiN3 entsteht. Daß sich kein Heterocuban bildet, ist auf den sterischen Anspruch der Cp*‐ und SiMe3‐Gruppen zurückzuführen.

Synthesis, Structure, and Rearrangement of Chlorobis(2,4,6‐tri‐tert‐butylphenyl)gallane The title compound 1 is easily obtained from GaCl3 and 2 equvialents of supermesityllithium. According to an X‐ray structure analysis one of the supermesityl rings shows a large deviation from planarity. Heating of 1 in vacuo gives mainly two products: an isomer of 1 in which one of the supermesityl groups is bound to Ga by one of its tert‐butyl groups (2) and a benzo[b]gallolane (3) formed by elimination of HCl, X‐ray structure analyses and full NMR (1H, 13C) data are provided for 1 and 2, MS and characteristic NMR (1H, 13C) data for 3.