Unusual reactions of [{μ-(phthalazine-N2:N3)}Fe2(μ-CO)(CO)6] with organolithium reagents. A novel coordination mode of 1,2-diazane diiron carbonyl compounds

Abstract

[{μ-(Phthalazine-N²:N³)}Fe₂(μ-CO)(CO)₆] (1) reacts with organolithium reagents, RLi (R = CH₃, C₆H₅, p-CH₃C₆H₄, p-CH₃OC₆H₄, p-CF₃C₆H₄, p-C₆H₅C₆H₄), followed by treatment with Me₃SiCl to give the novel diiron carbonyl complexes with a saturated N–N six-membered diazane ring ligand, [{C₆H₄CH(R)NNCH₂}Fe₂(CO)(CO)₆] (2, R = CH₃; 3, R = C₆H₅; 4, R = p-CH₃C₆H₄; 5, R = p-CH₃OC₆H₄; 6, R = p-CF₃C₆H₄; 7, R = p-C₆H₅C₆H₄). Compounds 4 and 5 were treated with [(NH₄)₂Ce(NO₃)₆] to afford the aryl-substituted phthalazine-coordinated diiron carbonyl compounds [(μ-{1-(p-CH₃C₆H₄)-phthalazine-N²:N³})Fe₂(μ-CO)(CO)₆] (8) and [(μ-{1-(p-CH₃OC₆H₄)-phthalazine-N²:N³})Fe₂(μ-CO)(CO)₆] (9), respectively. The structures of complexes 4 and 9 have been established by X-ray diffraction studies.