Abstract
The dilithiated derivative 2 of 1,1′-bis(trimethylsilylamino)ferrocene ( 1) reacts with various aluminum dichlorides RAlCl 2 [R = t Bu ( 3a), CH(SiMe 3) 2 ( 3b), Si(SiMe 3) 2 ( 3d)] in the presence of pyridine to give the respective 1,3,2-diazaalumina-[3]ferrocenophanes 4a, b, d as pyridine adducts, of which 4a could be isolated in good yield and high purity. The aluminum halide (Me 3Si) 3CAlCl 2 in THF did not react with 2. The molecular structure of 4a, determined by X-ray analysis, shows the tert-butyl group in trans-position relative to the N–Si bond vectors. NMR spectra prove that prominent structural features are retained in solution, including restricted rotation about the Al–N(py) bond, shown by low-temperature NMR spectra.
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