C−Cl Bond Activation of ortho-Chlorinated Imine with Iron Complexes in Low Oxidation States

Abstract

The ortho-chelated iron(II) complexes [FeCl(PMe3)3((C6H3Cl-ortho)CH═N-R)] (R = Me, Ph) (3, 4) and [FeCl(PMe3)3(C6H4-CH═N-R)] (R = Ph, n-Bu) (7, 8) were prepared through oxidative addition of the C−Cl bond of ortho-chlorinated imine using iron(0) complexes, [Fe(PMe3)4]. The reactions of 3, 4, and 8 with CO delivered the carbonyl Fe(II) complexes 9−11. A one-pot reaction of [FeMe2(PMe3)4] with (C6H3Cl2-2,6)CH═N-Ph in CO atmosphere resulted in carbonyl Fe(II) complexes [FeMe(CO)(PMe3)2((C6H3Cl-ortho)CH═N-Ph)] (12). The crystal and molecular structures of complexes 3, 4, 7−9, and 12 were determined by X-ray diffraction.