819082-58-1Relevant academic research and scientific papers
Transition metal complexes of the chelating phosphine borane ligand Ph 2PCH2Ph2P·BH3
Merle, Nicolas,Koicok-Koehn, Gabriele,Mahon, Mary F.,Frost, Christopher G.,Ruggerio, Giuseppe D.,Weller, Andrew S.,Willis, Michael C.
, p. 3883 - 3892 (2004)
Chromium and ruthenium complexes of the chelating phosphine borane H, B-dppm are reported. Addition of H3B-dppm to [Cr(CO) 4(nbd)] (nbd = norbornadiene) affords [Cr(CO)4(n 1-H3B·dppm)] in which the borane is linked to the metal through a single B-H-Cr interaction. Addition of H 3B·dppm to [CpRu(PR3)(NCMe)2]+ (Cp = n5-C5H5) results in [CpRu(PR 3)(n1-H3B·dppm)][PF6] (R = Me, OMe) which also show a single B-H-Ru interaction. Reaction with [CpRu(NCMe)3] only resulted in a mixture of products. In contrast, with [CpRu(NCMe)3]+ (Cp* = n5-C 5Me5) a single product is isolated in high yield: [Cp*Ru(n2-H3B-dppm)][PF6]. This complex shows two B-H-Ru interactions. Reaction with L = PMe3 or CO breaks one of these and the complexes [Cp*Ru(L)(n1-H 3B-dppm)][PF6,] are formed in good yield. With L = MeCN an equilibrium is established between [Cp*Ru(n2-H 3B-dppm)][PF6 and the acetonitrile adduct. [Cp*Ru(n2-H3B-dppm)][PF6] can be considered as being operationally unsaturated , effectively acting as a source of 16-electron [Cp*Ru(n2-H 3B-dppm)][PF6]. All the new compounds (apart from the CO and MeCN adducts) have been characterised by X-ray crystallography. The solid-state structure of H3B-dppm is also reported.
