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Journal Article



Proft,  Bernd
Max-Planck-Institut für Kohlenforschung, Max Planck Society;


Pörschke,  Klaus-Richard
Research Group Pörschke, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Proft, B., & Pörschke, K.-R. (1993). cis-1,2-Bis(diphenylphosphino)ethen-Nickel(0)-Komplexe. Zeitschrift fur Naturforschung Section B-A Journal of Chemical Sciences, 48(7), 919-927.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-2B2E-B
We have studied the ligand properties of cis-Ph2PCH=CHPPh2 at nickel(0). Several homoleptic nickel(0) alkene complexes react with the twofold molecular quantity of cis-Ph2PCH=CHPPh2 to afford the red crystalline homoleptic 1:2 complex Ni(cis-Ph2PCH=CHPPh2)2 (1).The reactions of Ni(cdt) or Ni(C2H4)3 with equimolar amounts of cis-Ph2PCH=CHPPh2 yield orange-yellow crystals of the homoleptic 1:1 complex {(µ-cis-Ph2PCH=CHPPh2)Ni}n (2). Sparingly soluble 2 is presumably oligomeric with the (PCH=CHP)Ni moiety π-bonded to another nickel(0) center. The π bridges are rather stable and are only cleaved by strong π acceptors. For example, 2 reacts with CO to yield the known carbonyl complex (cis-Ph2PCH=CHPPh2)Ni(CO)2 (3). In contrast to the above synthesis of 2, the 1:1 reaction of Ni(cod), with cis-Ph2PCH=CHPPh2 affords orange-red crystals of the alkene complex (cis-Ph2PCH=CHPPh2)Ni(cod)•THF (4) in moderate yield. Ni(1,5-hexadiene), reacts readily with cis-Ph2PCH=CHPPh, (1:1) to give yellow (cis-Ph2PCH=CHPPh2)Ni(rac-η22-C6H10) (5, 77%), which exhibits a fluxional diene coordination. That these thermally labile alkene complexes are formed at all, is ascribed to the chelate effect of the dienes. From the reaction of 2, 4 or 5 with ethyne, yellow microcrystals of (cis-Ph2PCH=CHPPh2)Ni(C2H2)•Et2O (6) are obtained.