Darstellung, Struktur und Eigenschaften von N-Alkyliminoalanen / Preparation, Structure and Properties of N-Alkyliminoalanes

Abstract

The N-alkyliminoalanes [tert-C₄H₉NAIH]₄, [tert-C₄H₉NAID]₄, [iso-C₃H₇NAIH]₆, [C₂H₅NAlH]₈ and [CH₃NAIH]_n have been prepared and intermediates such as Al₃H₃(N tert-C₄H₉)2(N tert-NHC₄H₉)2 and Al₈H₁₀(NC₂H₅)₆(NHC₂H₅)₂ isolated. Cage structures and opened cages respectively are suggested on the basis of physical data. Halogenation of these iminoalanes by HgX₂ proceeds in a complicated manner, the products depending on the mole ratio used, the size of the alkylgroup and cage. HX formation during the halogenation is indicated by the formation of [Cl₂AlNHR]₂. Regioselectivity was observed for partial chlorination of [C₂H₅NAlH]₈. Pyrolysis of [RNHAIHCl]₂ yields [tert-C₄H₉NAlCl]₄ and [iso-C₃H₇NAlCl]₄.