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We have studied the ligand properties of cis-Ph 2 PCH=CHPPh 2  at nickel(0). Several homoleptic nickel(0) alkene complexes react with the twofold molecular quantity of cis-Ph 2 PCH=CHPPh 2  to afford the red crystalline homoleptic 1:2 complex Ni(cis-Ph 2 PCH=CHPPh 2 ) 2  (1). The reactions of Ni(cdt) or Ni(C 2 H 4 ) 3  with equimolar amounts of cis-Ph 2 PCH=CHPPh 2  yield orange-yellow crystals of the homoleptic 1:1 complex {(μ-cis-Ph 2 PCH=CHPPh 2 )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-Ph 2 PCH=CHPPh 2 )Ni(CO) 2  (3). In contrast to the above synthesis of 2, the 1:1 reaction of Ni(cod) 2  with cis-Ph 2 PCH=CHPPh 2  affords orange-red crystals of the alkene complex (cis-Ph 2 PCH = CHPPh 2 )Ni(cod) - THF (4) in moderate yield. Ni(1,5-hexadiene) 2  reacts readily with cis-Ph 2 PCH=CHPPh 2  (1:1) to give yellow (cis-Ph 2 PCH=CHPPh 2 )Ni(rac-η 2 ,η 2 -C 6 H 10 ) (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-Ph 2 PCH = CHPPh 2 )Ni(C 2 H 2 ) · Et 2 O (6) are obtained.

cis-1,2-Bis(diphenylphosphino)ethen-Nickel(0)-Komplexe / cis-1,2-Bis(diphenylphosphino)ethene Nickel(0) Complexes