Isocyanide ligands tungsten complexes

Tungsten Complexes Containing Carbonyi, Isocyanide, and Cyanide Ligands Tungsten Complexes Containing Hydrocarbon Ligands... 

In a three-component reaction, a cationic platinum isocyanide complex [(Ph3P)2Pt(CNR)Cl][BF4] is reacted with a /3-bromoamine and butyl lithium to give an imidazoldin-2-ylidene complex.This transformation can be a two-component reaction if the isocyanide ligand contains already the necessary amine functionality. This was shown for chromium, molybdenum, tungsten, and rhenium carbonyls. 

However, this work pre-dated the discovery of protonation of dinitrogen in the molybdenum and tungsten complexes and, once this had come to light, we turned our attention to the behaviour of isocyanides and alkynes at those sites that activated dinitrogen to reduction. For isocyanides, the first step was to bind these ligands in place of dinitrogen in the complexes trflns-[M(N2)2(dppe)2], which was done by a displacement reaction [Equation (23)]. ... 

TUNGSTEN COMPLEXES CONTAINING CARBONYL, ISOCYANIDE, AND CYANIDE LIGANDS... 

In a final variation, the hexafluorobutyne-molybdenum and -tungsten complexes (XX) and (XXI) react with excess tert-butyl isocyanide to afford iminocyclopentadiene complexes (Davidson et al, 1975). Release of the diene ligand from this complex was not reported. 

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