N‐Heterocyclic Tetrylenes with a 1,1′‐Ferrocenylene Backbone and Bis(2,4,6‐triisopropylphenyl)boryl <i>N</i> ‐Substituents

The diaminoferrocene derivative fc[NH(BTrip 2 )] 2 ( 1 H 2 ; fc = 1,1′‐ferrocenylene, Trip = 2,4,6‐triisopropylphenyl) was prepared from fc(NH 2 ) 2 and Trip 2 BF and used for the preparation of the N‐heterocyclic tetrylenes fc{[N(BTrip 2 )] 2 E} ( 1 E, E = Ge, Sn, Pb) via the TMEDA‐coordinated lithium amide 1 Li 2 (TMEDA) 2 (TMEDA = N , N , N ′, N ′‐tetramethylethylenediamine). The N‐heterocyclic plumbylene fc{[N(BMes 2 )] 2 Pb} ( 2 , Mes = mesityl), which was obtained analogously, reacts with 4‐(dimethylamino)pyridine (DMAP) to afford the adduct fc{N(BMes 2 )] 2 Pb(DMAP)} ( 3 ). No reaction with DMAP was observed with the sterically more congested plumbylene 1 Pb. 1 Pb and 2 both undergo immediate ammonolysis with NH 3 . All new compounds were structurally characterised by single‐crystal X‐ray diffraction.