Chemische Berichte p. 1299 - 1304 (1997)
Update date:2022-09-26
Topics:
Scheer, Manfred
Schuster, Kay
Krug, Andre
Hartung, Helmut
[Cr(CO)5PCI3] reacts with different metallates K[CpxMo(CO)3] [Cpx = η5-C5H4tBu (Cp′), η5-C5H3tBu2-1,3 (Cp″)], K[Cp″Fe(CO)2], K[Cp′Cr(CO)3], K[CpNi (CO)] and Na2[Cr2(CO)10] at -78 °C in THF to yield various P2, cycloP3 and cycto-P5 ligand complexes of the formulae [Cp′-Mo(CO)2(η3-P3)] (1a), [Cp″Mo(CO)2(η3-P3)] (1b), [{Cp′Mo-(CO)2)2(μ,η2-P 2)] (2a), [{Cp″Mo(CO)2)2(μ,η2-P 2)] (2b), [Cp″Fe(η5-P5)] (3), [(Cp′Cr)2(μ,η5-P5)] (4), [|Cp′Cr(CO)2)2-(μ,η2-P 2)1 (5), [(CpNi)2(μ,η2-P 2)(Cr(CO)5)2 (6), [{(CO)5Cr)Cl2PPCl2{Cr(CO)5)] (7) and [(Cr(CO)5}2PCl] (8). Comprehensive studies of the reaction pathway leading to formation of the cyclo-P3 product la give strong indications that a sequence involving metal-halogen exchange and stepwise P-P bond formation takes place, proceeding via [{(CO)5Cr)Cl2PPCl2{Cr(CO)5)] (7) and the cydo-P3 precursor compound [(Cp′Mo(CO)3){Cp′Mo(CO)2) 2(Cr(CO)5)(μ,η3:1:1 P3)] (9). The latter two complexes have been isolated and structurally characterized. VCH Verlagsgescllschaft mbH,.
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