Coordination chemistry of hepta- tert -butylnonaphosphane

Hepta- tert -butylnonaphosphane { cyclo -(P 4 t Bu 3 )} 2 P t Bu was employed as a ligand in transition metal complexes of iron(0) (1), cobalt(− i ) (2), copper( i ) (3) and rhodium( i ) (4), which are readily formed in moderate to good yields, and an unstable palladium( ii ) complex (5). The ligand features three different bonding modes (one monodentate (compounds 1 and 2) and two bidentate (compounds 3–5) with formation of four- or six-membered chelate rings), as determined by X-ray diffraction studies. The 31 P{ 1 H} NMR spectral data of 1–3 have been determined by automated line-shape analysis.