“…The group 14 metal (M) 1-azapentadienyls were prepared from the W-shaped Li[N(Bu t )(CH) 3 CH 2 ] and M(Cl)Me 3 ; for M = Si, the E,E-compound D was the sole product, but both D and the E,Z-D 0 were isolated for M = Sn [6]. Bleeke's review of heteropentadienyl-transition metal complexes included a section on azapentadienyls [9]. Paz-Sandoval and Rangel-Salas surveyed group 1 metal, Mg, group 14-and d-metal azapentadienyls; such lithium, trimethylsilyl and stannyl compounds are of ''increasing importance in organic synthesis, either as reagents for selective transformations or as intermediates for the creation of carbon-carbon bonds" [10]; they also suggested that the structure of A was better represented by A 0 .…”