我们提出了两性离子三phosph分子t Bu(C 5 H 2)(PPh 2)2 P I(L)的合成,该分子可以作为单齿或多齿配体,具有第6、7、8和9个金属羰基复合体。在光解条件下形成第6组[M(CO)5 L ]络合物,其中金属键合在P(I)中心。在Mo(CO)6的情况下,会生成双金属配合物[M(CO)5 L Mo(CO)3 ],其特征在于与磷(I)中心和分子的环戊二烯基部分。有趣的是,第7和9组金属羰基二聚体生成[M 2(CO)n L ]形式的双金属络合物,其中两个金属中心均键合在磷(I)中心上。提供了对这些分子的详细分析,包括X射线衍射,多核NMR,红外光谱和计算研究。
使用FeCl 2和适当取代的环戊二烯基盐LiC 5 H 3 -1,3-(PPh 2)2,LiC 5 H 3 -1-PPh 2 -3-之间的反应报道了具有大取代基的二茂铁基膦的合成。t Bu,LiC 5 H 2 -1,2-(PPh 2)2 -4- t Bu。这种策略导致生成双膦,三膦和四膦,而其他用于制备取代二茂铁的通道则无法获得双膦,三膦和四膦。[C 5 H 3 -1.3-(PPh 2)2](C 5 H 5)Fe,[C 5 H 3 -1-PPh 2 -3- t Bu] 2 Fe外消旋和内消旋和[C 5 H 2 -1,2-(PPh 2)2 -4- t通过单晶X射线衍射研究表征了Bu](C 5 H 5)Fe。
Congested Ferrocenyl Polyphosphanes Bearing Electron-Donating or Electron-Withdrawing Phosphanyl Groups: Assessment of Metallocene Conformation from NMR Spin Couplings and Use in Palladium-Catalyzed Chloroarenes Activation
4-chloropropiophenone, and 4-(trifluoromethyl)chlorobenzene were efficiently coupled to n-butyl furan, using Pd(OAc)2 associated to the new diphosphane ligands 1,1′-bis(diisopropylphosphanyl)-3,3′-di(triphenyl)methyl ferrocene (15) or 1,1′-bis(dicyclohexylphosphanyl)-3,3′-di(triphenyl)methylferrocene (16), which respectively hold the electron-rich −Pi-Pr2 and −PCy2 groups.
Modular functionalized polyphosphines for supported materials: previously unobserved<sup>31</sup>P-NMR «through-space» ABCD spin systems and heterogeneous palladium-catalysed C–C and C–H arylation
作者:Matthieu Beaupérin、Radomyr Smaliy、Hélène Cattey、Philippe Meunier、Jun Ou、Patrick H. Toy、Jean-Cyrille Hierso
DOI:10.1039/c4cc04307c
日期:——
Functionalized modular polyphosphines introduce a conceptual novelty in controlling both implantation and conformation of donors in immobilized catalysts.
功能化模块化多膦在控制固定催化剂中供体的植入和构象方面引入了概念上的创新。
Functionalized Tri‐ and Tetraphosphine Ligands as a General Approach for Controlled Implantation of Phosphorus Donors with a High Local Density in Immobilized Molecular Catalysts
作者:Matthieu Beaupérin、Radomyr Smaliy、Hélène Cattey、Philippe Meunier、Jun Ou、Patrick H. Toy、Jean‐Cyrille Hierso
DOI:10.1002/cplu.201402195
日期:2015.1
immobilization on virtually any kind of support. As evidenced by 31P NMR spectroscopy and the strong “through‐space” spin–spin TSJ(P,P) coupling observed between P atoms, these modified polyphosphines induce, when immobilized on a support, a high local concentration of phosphorus donors that are spatially very close to each other (3–5 Å). These functionalized ligands have been incorporated into polystyrene
负载的膦配体是在过渡金属促进的催化方面具有学术和工业热点的辅助剂。但是,应实现配体的受控注入和受控构象,以生产能够在结构上“复制”有效均相系统的固定化催化剂。我们在此提供了一种通用的合成策略,用于组装一类具有独特受控刚性构象的新型支化四膦和三膦配体,从而提供高局部密度的磷原子,以扩展与金属中心的配位。我们制备了新的官能化环戊二烯基(Cp)盐,以设计“准备固定”的多膦。这些受保护的Cp片段也可能具有合成用途,可用于生成其他负载的茂金属。然后形成了四膦和三膦并对其进行了多种功能化,以固定在几乎任何种类的载体上。如证明31 P NMR光谱以及在P原子之间观察到的强“自旋-自旋-自旋TS J(P,P)耦合”,当这些修饰的多膦固定在载体上时,会诱导高局部浓度的磷供体,这些供体在空间上非常彼此靠近(3–5Å)。这些官能化的配体已被掺入聚苯乙烯中,以得到可溶或不溶的聚合物并在无机载体如二氧化硅上。我们报告了在固定载有多膦配体的低钯负载量为0
Palladium C–N bond formation catalysed by air-stable robust polydentate ferrocenylphosphines: a comparative study for the efficient and selective coupling of aniline derivatives to dichloroarene
The arylation of aniline derivatives with dichloroarenes under a low palladium content (below the currently used 5 to 10 mol%) was studied using nine different ferrocenylphosphine ligands, including the easily accessible 1,1′-bis(diphenylphosphino)ferrocene, DPPF. The electron-enriched air-stable tridentate ferrocenylpolyphosphine 1,2-bis(diphenylphosphino)-1′-(diisopropylphosphino)-4-tert-butylferrocene
使用九种不同的二茂铁基膦配体,包括容易获得的1,1'-双(二苯基膦基)二茂铁,DPPF,研究了钯含量低(低于目前使用的5-10 mol%)下苯胺衍生物与二氯芳烃的芳基化作用。电子富集的空气稳定的三齿ferrocenylpolyphosphine 1,2-双(二苯基膦基)-1' - (二异丙基)-4-叔-butylferrocene,L5,在2摩尔%与1摩尔%[的PdCl(采用组合η 3 - C 3 H 5)] 2允许有效和选择性的偶联,而目前这种要求苛刻的底物引发了氯芳烃均偶联和/或脱卤过程。探索了优化系统的范围和局限性,重点关注贫电子的氟苯胺(失活的亲核试剂)和富电子的甲基化和甲氧基化的二氯苯(失活的亲电试剂)。
Conformational Control of Metallocene Backbone by Cyclopentadienyl Ring Substitution: A New Concept in Polyphosphane Ligands Evidenced by “Through-Space” Nuclear Spin−Spin Coupling. Application in Heteroaromatics Arylation by Direct C−H Activation
作者:Radomyr V. Smaliy、Matthieu Beaupérin、Hélène Cattey、Philippe Meunier、Jean-Cyrille Hierso、Julien Roger、Henri Doucet、Yannick Coppel
DOI:10.1021/om8012162
日期:2009.6.8
conformation of the ferrocene backbone in solution. The palladiumcomplexes of the triphosphane ligand 6 and the diphosphane 1,1′-bis(diphenylphosphino)-3,3′-di(triphenyl)methylferrocene (7) were successfully used in the direct C−H activation of electron-rich heteroaromatics for coupling to demanding aryl bromides, whether electron rich and/or sterically congested. Products such as 2-butyl-5-(4-methoxyphenyl)furan