176725-52-3Relevant academic research and scientific papers
Cationic palladium η3-allyl complexes with hemilabile P,O-ligands: Synthesis and reactivity. Insertion of ethylene into the Pd-allyl function
Mecking, Stefan,Keim, Wilhelm
, p. 2650 - 2656 (1996)
Cationic palladium allyl complexes [(η3-C3H5)Pd(κ 2P∧O)]+SbF6- (2[SbF6], P∧O ≡ Ph2P(CH2)2C-(=O)OEt; 3[SbF6], o-Ph2PC6H4C(=O)OEt; 4[SbF6], Ph2P(CH2)2P(=O)Ph2) have been prepared. In all complexes the oxygen donor can be displaced by other ligands such as carbon monoxide and ethylene. Displacement of an ester donor occurs much more readily than displacement of the phosphine oxide function. Above 0°C, the resulting ethylene complexes [(η3-C3H5)-Pd(C2H 4)(κ1P～O)]+ react to give (1,2,5-η3)-pent-1-en-5-yl complexes [(H2C=CH(CH2)3Pd-(κ 2P∧O)]+. A rate constant of e.g. k(17°C) = (2.27 ± 0.11) × 10-4 s-1 was determined for P,O ≡ Ph2P(CH2)2C(O)OEt by 1H NMR spectroscopy. Using 2-4 as catalyst precursors for ethylene dimerization, the allyl moiety is ultimately cleaved from the metal center as 1,4-pentadiene.
