The synthesis and crystal structure of the η-cyclopentadienylniobium compound [Nb(η-C5H5)Cl2(NOBut)], which contains the first example of the terminal transition metal–alkoxylimide ligand system M![[double bond, length half m-dash]](http://hg.y866.cn/compound/lib/scimg/usr/1/CC9960001343.jpg)
N–OR, is reported along with some preliminary reactivity studies.
