A systematic study on the synthesis, reactivity and structure of ortho-palladated aryloximes, including the first cyclopalladated aryloximato and iminoaryloxime complexes
作者:José Vicente、María-Teresa Chicote、Antonio Abellán-López、Delia Bautista
DOI:10.1039/c1dt11445j
日期:——
Complexes [PdC,N-ArC(Me)NOH}-2}(μ-Cl)]2 (1) with Ar = C6H4, C6H3NO2-5 or C6H(OMe)3-4,5,6, were obtained from the appropriate oxime, Li2[PdCl4] and NaOAc. They reacted with neutral monodentate C-, P- or N-donor ligands (L), with [PPN]Cl ([PPN] = Ph3PNPPh3), with Tl(acac) (acacH = acetylacetone), or with neutral bidentate ligands N⁁N (tetramethylethylenediamine (tmeda), 4,4′-di-tert-butyl-2,2′-bipyridine (tBubpy)) in the presence of AgOTf or AgClO4 to afford complexes of the types [PdC,N-ArC(Me)NOH}-2}Cl(L)] (2), [PPN][PdC,N-ArC(Me)NOH}-2}Cl2] (3), [PdC,N-ArC(Me)NOH}-2}(acac)] (4) or [PdC,N-ArC(Me)NOH}-2}(N⁁N)]X (X = OTf, ClO4) (5), respectively. Complexes 1 reacted with bidentate N⁁N ligands in the presence of a base to afford mononuclear zwitterionic oximato complexes [PdC,N-ArC(Me)NO}-2}(N⁁N)] (6). Dehydrochlorination of complexes 2 by a base yielded dimeric oximato complexes of the type [Pdμ-C,N,O-ArC(Me)NO}-2}L]2 (7). The insertion of XyNC into the Pd–Caryl bond of complex 2 produced the mononuclear iminoaryloxime derivative [PdC,N-C(NXy)ArC(Me)NOH}-2}Cl(CNXy)] (8) which, in turn, reacted with [AuCl(SMe2)] to give [Pdμ-N,C,N-C(NXy)ArC(Me)NOH}-2}Cl]2 (9) with loss of XyNC. Some of these complexes are, for any metal, the first containing cyclometalated aryloximato (6, 7) or iminoaryloxime (8, 9) ligands. Various crystal structures of complexes of the types 2, 3, 6, 7, 8 and 9 have been determined.
从适当的肟、Li2[PdCl4]和 NaOAc 中得到了 Ar = C6H4、C6H3NO2-5 或 C6H(OMe)3-4,5,6 的[PdC,N-ArC(Me)NOH}-2}(μ-Cl)]2 (1) 复合物。它们与中性单齿 C、P 或 N 供体配体(L)、[PPN]Cl([PPN] = Ph3PNPPh3)、Tl(acac)(acacH = 乙酰丙酮)或中性双齿配体 N⁁N(四甲基乙二胺(tmeda)、4,4′-二叔丁基-2、2′-联吡啶(tBubpy))在 AgOTf 或 AgClO4 存在下生成 [PdC,N-ArC(Me)NOH}-2}Cl(L)] (2)、[PPN][PdC、N-ArC(Me)NOH}-2}Cl2](3)、[PdC,N-ArC(Me)NOH}-2}(acac)](4) 或 [PdC,N-ArC(Me)NOH}-2}(N⁁N)]X (X = OTf, ClO4) (5)。络合物 1 在碱存在下与双齿 N⁁N 配体反应,得到单核齐聚物草酰亚胺络合物 [PdC,N-ArC(Me)NO}-2}(N⁁N)](6)。络合物 2 经碱脱氢氯化后得到了[Pdμ-C,N,O-ArC(Me)NO}-2}L]2 型二聚氧化亚氨配合物(7)。将 XyNC 插入络合物 2 的 Pd-Caryl 键后,产生了单核亚氨基芳肟衍生物 [PdC,N-C(NXy)ArC(Me)NOH}-2}Cl(CNXy)] (8),该衍生物又与 [AuCl(SMe2)] 反应,得到 [Pdμ-N,C,N-C(NXy)ArC(Me)NOH}-2}Cl]2 (9),同时失去了 XyNC。对于任何金属而言,其中一些配合物都是首次含有环甲基芳基肟(6、7)或亚氨基芳基肟(8、9)配体的配合物。目前已确定了 2、3、6、7、8 和 9 型配合物的各种晶体结构。