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note
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3 at 298 K. In the case of complex 1A we have also studied the reaction in the presence of but-2-ynedioic acid dimethyl ester (dma) yielding the palladacyclopentadiene derivative. The reactivity induced by dma lies between those of nq and dmfu.
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52049118382
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We chose fumaronitrile as the target olefin since the ensuing reactivity rates were within reasonable time intervals and because the reactions carried out in the presence of ma underwent a further slow attack of the stannane to the carbonyl groups of the coordinated maleic anhydride to give 1,8-diphenyl-oct-4-ene-1,7-diyne-3,6-dione, di(n-butyl-stannane)oxide, the free ligand MeN-SPh and palladium metal according to the reaction in the following scheme 4. It is noteworthy that the reaction between free ma and stannane carried out in the presence of complex 1A is remarkably slower than that reported above. Apparently, the side reaction noticed during the kinetic investigation is the attack of the stannane to the coordinated ma in the Pd(0) derivative.{A figure is presented}
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1H NMR technique under our experimental conditions. We therefore took into consideration the steady state approach following the associative attack which was suggested by other authors [20].Moreover, the ring opening is somehow confirmed by the slowing down of the overall reaction rate upon addition of the free ligand MeN-SPh. Apparently, the free ligand strongly competes with the stannane and the olefin in solution owing to its capability in saturating the vacant coordination sites. Furthermore, the complete displacement of the ligand was also ruled out since in this case the ensuing kinetic law did not agree with the experimentally observed one.
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E2 open mechanism could be operative on the basis of the olefin nature which renders the palladium centre sufficiently electrophilic and of the nucleophilicity of the alkenyl stannane.
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52049101433
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3 at 298 K were over in: (fn) 1A: <7 min; 1B: 60 min; 1C: 105 min; 1D: 480 min; 1E: 5 days (82%); (ma) 1A: <7 min; 1C: 10 min; 1E: <1 day.
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Canovese L., Visentin F., Chessa G., Uguagliati P., Santo C., and Maini L. J. Organomet. Chem. 692 (2007) 2342-2345
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Santo, C.5
Maini, L.6
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