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Serendipitous syntheses and structures of [Cp2Nb(H){(SiMe2)2(µ-NR)}]Electronic supplementary information (ESI) available: experimental section. Fig. 1S and Table 1S. See http://www.rsc.org/suppdata/cc/b1/b111636c/ Dedicated to Prof. Dr J. Lorberth on the occasion of his 65th birthday.