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Phosphinooxazolines as assembling ligands in heterometallic complexes
Braunstein, Pierre,Clerc, Guislaine,Morise, Xavier,Welter, Richard,Mantovani, Giuseppe
, p. 1601 - 1605 (2007/10/03)
It is shown that phosphinooxazolines such as (2-oxazoline-2-ylmethyl) diphenylphosphine 1 can be used as P,N assembling ligands for the synthesis of heterometallic complexes. These were obtained in a stepwise manner from the iron carbonyl complexes containing one, [Fe(CO)4(PCH2- oxazoline-P)]2, or two, trans-[Fe(CO)3(PCH 2-oxazoline-P)2] 6, P-bound phosphinooxazoline ligands. These metalloligands were then reacted with metal complexes. With 2, complete ligand transfer from Fe to the second metal (Pd) was sometimes observed. The metal-metal bonded complex [(OC)4Fe(μ-PCH2-oxazoline-P, N)PdCl2]3 was of limited stability, whereas the trinuclear complex trans-[{(OC)4Fe(μ-PCH2-oxazoline-P,N)} 2CoCl2] 4, in which 2 functions as a N-donor metalloligand toward the tetrahedral Co(II) centre, was stable and could be fully characterised by X-ray diffraction. This complex catalyses the oligomerization of ethylene to give linear α-olefins in the range C4-C 26, with a maximum of the Schulz-Flory distribution around C 6. The complex [{(OC)4Fe(μ-PCH2-oxazoline-P, N)}2HgI2] 5 was also prepared from 6. With the metalloligand 6, the Fe→Pd and Fe→Co metal-metal bonded compounds trans-[(OC)3Fe(μ-PCH2-oxazoline-P,N) 2Pd(NCMe)](BF4)2 8 and trans-[(OC) 3Fe(μ-PCH2-oxazoline-P,N)2CoCl2] 9 were obtained. The Royal Society of Chemistry 2003.
