Niobocene complexes

Garcia-Yebra et reported on the synthesis of alkynyl- and vinylidene-niobocene complexes and an unexpected / -vinylidene- / -alkyne isomerization. They used AIM to locate CPs. For example, the existence of the metal-CH interaction was confirmed via the presence of two BCPs, one between Nb and H and the other between Nb and C. A RCP between Nb, C and H was also found. 

Yasuda and coworkers51 reported a route to niobocene-allyl compounds by hydrometa-lation of conjugated dienes with niobium hydrido-olefin complexes, NbH(C5H5)2(olefin),... 

The X-ray structure of 83 was in accord with the prediction of Scheme 4 in that the Si-Cl bond lies in the niobocene bisecting plane trans to the hydride and is elongated compared with classical complexes of the type [M(SiR2Cl)L ]. There was, however, no good reference system that would allow for the comparison of the Nb-Si bond lengths. The metal-silyl bond lengths are strongly affected by Bent s... 

In these final examples, Otero and coworkers described the reaction of a niobocene hydride (134) with triphenylgermanium hydride to afford niobocene germyl complexes... 

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