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- W2070710797 abstract "The reaction of Ph2PCH2PPh2 (dppm) with ClCH2C(O)CH2Cl (1:1 molar ratio) in refluxing CHCl3 gives the new ylide-phosphonium salt 1, through quaternization of the two P atoms of the dppm and spontaneous loss of HCl. Compound 1 reacts with NEt3 in CHCl3 or CH2Cl2 solution (1:1 molar ratio) giving a mixture of the bis-ylide compound 2a and the ylide-methanide 2b (molar ratio 2a:2b=1:2). This mixture (prepared in situ) reacts with PdCl2(NCMe)2 to give the corresponding dichloride(bis-ylide) complex 3a (coordination through the two ylidic carbons) and the dichloride(ylide-methanide) complex 3b (coordination through the ylide carbon and the methanide carbon), in a molar ratio 3a:3b=1:2. The reaction of the mixture 3a:3b with AgClO4 (1:2 molar ratio, NCMe or Me2CO) in the presence of neutral ligands L gives the corresponding mixtures of the dicationic complexes [Pd(L)2(C,C-bis-ylide)](ClO4)2 (4a, L=NCMe; 5a, L=pyridine) and [Pd(L)2(C,C-ylide-methanide)](ClO4)2 (4b, L=NCMe; 5b, L=pyridine) (molar ratio 4a:4b=1:2; molar ratio 5a:5b=3:1). On the other hand, the reaction of Ph2PCH2PPh2 (dppm) with ClCH2C(CH2)CH2Cl (1:1 molar ratio) in refluxing ClCH2CH2Cl gives the bis-phosphonium salt 6. This salt reacts with LitBu and PdCl2(NCMe)2 (1:2.2:1 molar ratio) in THF affording the ylide-methanide complex 7. The crystal structures of complexes 3b·3dmso and 7·CHCl3 have been determined by X-ray diffraction." @default.
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- W2070710797 date "2003-04-01" @default.
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- W2070710797 title "Synthesis and characterization of PdII complexes containing cyclic bis-ylides" @default.
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