Scheme 2.

Synthesis of W(CO)₅(E-2) from W(CO)₅(1^Et) [20–21] and aminoferrocene [40–41] with concomitant formation of E-1,2-diferrocenylimine E-3 [43] as side-product and atom numbering of W(CO)₅(E-2) for NMR assignments.