Variable coordination of a chiral diphosphine containing an amidinium/NHC group within its backbone: μ-P,P′, κ2-P,P′ and κ3-P,C,P′ coordination modes
作者:Paul D. Newman、Kingsley J. Cavell、Benson M. Kariuki
DOI:10.1039/c2dt31475d
日期:——
non-coordinated. 2 and 3a react with CH3I to give the dimers trans-[Pd2(μ-1·H)2I4](PF6)2, 6, and trans-[Pt2(μ-1·H)2I4](PF6)2, 7, as the major products. This bridging mode of coordination of [1·H]+ is also seen in trans-[Rh2(μ-1·H)(1,5-COD)2Cl2]PF6, 4, and [Pt2(μ-κ2-1·H)(dvdms)]PF6, 5. Upon treatment with KOtBu complexes 2 and 3a undergo deprotonation at the amidinium carbon to give trans-[M(κ3-P,C,P′-1)Cl]PF6
二膦配体(1·HPF 6 6666),是PC NHC P钳的潜在前体,其骨架包含两个亚苯基和一个中心双环4-氮杂-2-氮杂-2-氮杂双环[3.2.1] oct-2-烯单元已被合成并与Pd(II)和Pt(II),得到反式- [M(κ 2 - P,P ' - 1·H )氯2 ] PF 6,其中M =加入Pd(2)或Pt (3a)。2和3a的单晶结构测定显示了二膦以跨跨方式配位且and单元被质子化且不配位的配合物是同构的。2和图3a用CH反应3我,得到二聚体反式- [钯2(μ- 1·H )2我4 ](PF 6)2,6,和反式- [PT 2(μ- 1·H )2我4 ](PF 6)2,7,作为主要产品。[协调的这种桥接模式1·H ] +也可见于反式的[Rh - 2(μ- 1·H )(1,5-COD)2氯2 ] PF 6,4,和[PT 2(μ -κ 2 - 1·H )(dvdms)] PF 6,5。在