Cyclobutadiene-homologous diazadiboretidines as ligands for transition metals.
The sandwich type product CpCoL and the carbonyl species (OC)3FeL, (OC)4CrL, (OC)4MoL, and (OC)4WL were prepd. with diazadiboretidines (RBNR')2 (L) as tetra-hapto ligands (R = Me, Et, Pr, Bu, R' = CMe3; R = R' = CHMe2). The ligand (Me2CHBNCHMe2)2, prepd. by a novel catalytic cyclodimerization of Me2CHB.tplbond.NCHMe2, undergoes subsequent cyclodimerization to the 8-membered ring (Me2CHBNCHMe2)4 at ambient temp., whereas the corresponding cycloreversion occurs at 100 Deg.
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