Complexes of the composition trans-[Pd(L)2(OAc)2] have been postulated as intermediates during cyclopalladation. The first structural characterization of such a precursor has now been achieved and its role in the reaction sequence has been established. Diacetato-kappa2O-bis[(S)-1-(4-fluorophenyl)ethylamine-kappaN]palladium(II), [Pd(O2CMe)2(4-FC6H3CHMeNH2)2] or [Pd(C2H3O2)2(C8H10FN)2], (I), was obtained from palladium(II) acetate and (S)-NH2CHMeC6H3F-4 in a 1:2 molar ratio. The intermediate was then reacted with additional palladium(II) acetate to give the acetate-bridged dinuclear complex di-mu-acetato-kappa4O:O'-bis[[(S)-2-(1-aminoethyl)-5-fluorophenyl-kappa2C1,N]palladium(II)] benzene hemisolvate, [Pd(4-FC6H3CHMeNH2)2(mu-O2CMe)]2.0.5C6H6 or [Pd2(C8H9FN)2(C2H3O2)2].0.5C6H6, (II).
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