N,N,N′,N′-Tetramethylethylendiamin-di(tert-butyl)aluminium-Kationen — Molekülstruktur des [(Me3C)2Al · TMEDA]⊕[(Me3C)2AlBr2]⊖ |
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Authors: | Werner Uhl Jürgen Wagner Dieter Fenske Gerhard Baum |
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Abstract: | (N,N,N′,N′ -tetramethylethylendiamine) di(tert-butyl)aluminium Cations — Molecular Structure of (Me3C)2Al(TMEDA)]⊕(Me3C)2AlBr2]? Dimeric di(tert-butyl)aluminium halides (Me3C)2AlX (X = Cl, Br) react with N,N,N′,N′ -tetramethylethylendiamine (TMEDA) to give three compounds: the salt-like (Me3C)2Al(TMEDA)]⊕(Me3C)2AlX2]? 1 , characterized by crystal structure determination, and (Me3C)2Al(TMEDA)]⊕X? 3 both with chelating amine, and the more covalent, pentane soluble (Me3C)2AlX(TMEDA) 2 with TMEDA bound by only one nitrogen atom. The reaction resembles the symmetrical and unsymmetrical cleavage of diborane(6). 3 (X = Cl) is also formed by treatment of 1 with boiling n-hexane in the presence of TMEDA over a period of 24 hours, while for X = Br the more covalent 2 is the main product under similar conditions. In solution 2 decomposes slowly yielding different products in dependency of the solvent: in benzene 3 and in n-pentane 1 are formed. |
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Keywords: | Reaction of dimeric di(tert-butyl)aluminium halides with tetramethylethylendiamine symmetrical and unsymmetrical cleavage aluminium cations |
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