251906-36-2Relevant academic research and scientific papers
Five- and six-membered palladacycles derived from [(η5-C5H5)Fe{(η5-C 5H4)-CH=N-(C6H4-2-C 6H5)}]
Benito, Monica,Lopez, Concepcion,Morvan, Xavier
, p. 2583 - 2595 (1999)
The reaction of the novel ferrocenyl Schiff base: [(η5-C5H5)Fe{(η5-C 5H4)-CH=N-(C6H4-2-C 6H5)}] (1) with Na2[PdCl4] and Na(CH3COO)·3H2O in a 1:1:1 molar ratio in methanol is reported. In this reaction two different di-μ-chloro-bridged cyclopalladated complexes: [Pd{[(η5-C5H3)-CH=N-(C6H 4-2-C6H5)]Fe(η5-C 5H5)}(μ-Cl)]2 (2a) and [Pd{[(C6H4-2-C6H4)-N=CH-(η 5-C5H4)]Fe(η5-C 5H5)}(μ-Cl)]2 (2b) can be formed depending on the experimental conditions. Compounds 2a and 2b, which differ in the nature of the metallated carbon atom (Csp2,ferrocene or Csp2,biphenyl, respectively), undergo cleavage of the 'Pd(μ-Cl)2Pd' bridges in the presence of thallium (I) acetylacetonate, deuterated pyridine or triphenylphosphine giving the monomeric derivatives: [Pd(C∧N)(acac)] (3a, 3b) and [Pd(C∧N)Cl(L)] {with L=py- d5(4a, 4b), PPh3(5a, 5b)}. The reactions of 2 with 1,2-bis(diphenylphosphino)ethane (dppe) reveal that the two isomers (2a and 2b) exhibit different reactivity versus dppe. These results have been interpreted on the basis of steric effects. Elsevier Science Ltd.
