Four-membered Chelate Rings in Complexes with 2,2-Bis(diphenylphosphino)propane. Crystal and Molecular Structures of trans-2>, (η-C5H5)> and RhCl2>(Rh-Ru)

DOI: 10.1039/DT9950002901

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2901 - 2908 (1995)

Update date:2022-08-04

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Authors:

Barkley, James V.

Grimshaw, Julia C.

Higgins, Simon J.

Hoare, Paul B.

McCart, Mark K.

Smith, Anthony K.

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Article abstract of DOI:10.1039/DT9950002901

The compound Me2C(PPh2)2 (2,2-dppp) reacted with 0.5 equivalent of to afford monomeric 1.Metathesis with LiBr afforded 2.With 0.25 equivalent of the rigid, square-planar Cl 3 was formed.These results are in sharp contrast to the chemistry seen with H2C(PPh2)2 and H(Me)C(PPh2)2.With 0.5 equivalent of , 2,2-dppp reacted to give brown-orange trans- 4a.In solution this is in equilibrium with a green five-co-ordinate species Cl 4b, the first such complex to be observed with a four-membered chelating diphosphine.With , 2,2-dppp reacted to form 5.Although its rhodium(I) chemistry suggests that 2,2-dppp favours chelation rather than bridging modes of co-ordination, when 5 was treated with 0.5 equivalent of it readily formed <(η-C5H5)Ru(μ-CO)2(μ-2,2-dppp)RhCl2>(Ru-Ru) 6.The structures of 4-6 have been determined by X-ray diffraction.

Full text of DOI:10.1039/DT9950002901

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