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The sandwich type product CpCoL (1c) and the carbonyl species (OC) 3 FeL (2c), (OC) 4 CrL (3e), (OC) 4 MOL (4b), and (OC) 4 WL (5b) were prepared with diazadiboretidines (RBNR′) : (L) as tetra-hapto ligands (a-d: R = Me, Et, Pr. Bu; R′ = tBu; e: R = R′ = iPr). The ligand (iPrBNiPr) 2  , prepared by a novel catalytic cyclodimerisation of iPrB≡NiPr, undergoes subsequent cyclodimerisation to the eight-membered ring (iPrBNiPr) 4  at ambient temperature, where-as the corresponding cycloreversion occurs at 100 °C. The structure of the complexes (OC) x ML is discussed by means of IR and NMR data and the structures of crystalline 2c and 5d were determined by X-ray crystallography.

zeitschrift für naturforschung b

Cyclobutadien-homologe Diazadiboretidine als Liganden von Übergangsmetallen / Cyclobutadiene-Homologous Diazadiboretidines as Ligands to Transition Metals