Palladium(II)-induced preferential activation of the σ[Csp2(phenyl)–Cl] bond versusσ[Csp2(ferrocene)–H]. Crystal structure of [Fe(η5-C5H5){η5-C5H4CH2NCH(C6H3Cl2-2,6)}]
摘要:
The ferrocenylimine [Fe(eta(5)-C5H5){eta(5)-C5H4CH2N=CH(C6H3Cl2-2,6)}] has been prepared by condensation of aminomethylferrocene and 2,6-dichlorobenzaldehyde, and characterized by IR, NMR (H-1 and C-13) spectroscopy and X-ray diffraction. The compound is triclinic, space group P (1) over bar, with a = 7.553(3), b = 11.763(2), c = 18.148(2) Angstrom, alpha = 89.94(1), beta = 98.90(2) and gamma = 91.91(2)degrees. It reacts with Na-2[PdCl4] and NaO2CMe . 3H(2)O in a 1:1:1 molar ratio, producing the di-mu-chloro-bridged cyclopalladated complex [{Pd[(3-ClC6H3)CH=NCH2(eta(5)-C5H4)Fe(eta(5)-C5H5)](mu-Cl)}(2)]. Further treatment of this compound with triphenylphosphine results in cleavage of the 'Pd(mu-Cl)(2)Pd' units, yielding the monomeric derivative [Pd{(3-ClC6H3)CH=NCH2(eta(5)-C5H4)Fe(eta(5)-C5H5)}Cl(PPh3)]. These compounds contain an endocyclic five-membered palladocycle fused with the phenyl ring and arise by activation of a sigma(C-CI) bond. The reactivity of N-(2,6-dichlorobenzylidene)benzylamine and the analogous ferrocenyl Schiff bases is compared.