一系列单体钯环络合物轴承Ñ丁基取代的N-杂环卡宾,即[钯(NHC)X(DMBA)](DMBA:二甲基苄胺和[钯(NHC)X(PPY)]; NHC:1- ñ -丁基-3-取代的苄基咪唑-2-亚基; ppy:2-苯基吡啶),是通过相应的卡宾银配合物的金属转移反应或通过相应的乙酸桥键式四环化合物二聚体与N-杂环卡宾配体的高产率反应而制得的。 。使用元素分析,APCI-MS,1 H NMR和13 C NMR光谱对钯(II)配合物进行表征。这些络合物在苯硼酸和芳基溴化物之间的Suzuki-Miyaura偶联反应中很有效。
was determined by single-crystal X-ray diffraction study. The catalytic activities of all palladium complexes were evaluated in the direct C-H bond arylation of the 2-acetylfuran and 2-acetylthiophene with (hetero) aryl bromides and readily available and inexpensive aryl chlorides in presence of 1 mol% catalyst loading at 120 °C. Under the given conditions, (hetero)aryl halides were successfully applied
Synthesis of Ruthenium(II) Complexes Containing Tridentate Triamine (′N ͡N ͡N′) and Bidentate Diamine Ligands (N ͡N′): as Catalysts for Transfer Hydrogenation of Ketones
upon replacement of p-cymene by meridional ′N ͡N ͡N′. The complexes 1–10 were screened for transferhydrogenation (TH) of arylketones with 2-propanol. The highest catalytic activity was obtained with the complexescontaining tridentate ′N ͡N ͡N′ and 7, which contain nonsulfonated 2-(aminomethyl)pyridine. However, for complexes 6a–c, containing p-cymene (a facial tridentate ligand), a slower reaction
一系列中性和阳离子的Ru(II)络合物(1 - 10),轴承吡啶系三齿('N N N'),吡啶系双齿(N N'),并混合'N N N'+ N N通过从[RuCl 2(DMSO)4 ]和[RuCl 2(p- cymene)] 2前体开始合成''配体。通过单晶X射线衍射确定混合配体络合物9和10的固态结构。两种配合物都不同寻常,因为在无碱条件下,N͡N'配体在空气中自发氧化,在取代p后得到亚胺-胺二齿配体子午线'N͡N′N'。配合物1 - 10筛选芳基酮的转移氢化(TH)与2-丙醇。含有三齿'N͡N͡N'和7的配合物获得了最高的催化活性,所述配合物含有未磺化的2-(氨基甲基)吡啶。但是,对于含有p - Cymene(面部三齿配体)的复合物6 a-c,观察到较慢的反应速率。
Synthesis of N-heterocyclic carbene-palladium-PEPPSI complexes and their catalytic activity in the direct C-H bond activation
their two nitrogen atoms substituted by bulky groups have been synthesized. The benzimidazolium salts were readily converted into the corresponding palladium-NHC-PEPPSI complexes with general formula [PdBr2(NHC) (Py)], (NHC = N-heterocyclic carbene; PEPPSI = pyridine-enhanced precatalyst preparation, stabilisation, and initiation). The structures of all new compounds were characterized by NMR, IR spectroscopy
Ruthenium(II)‐(
<i>p</i>
‐cymene)‐N‐Heterocyclic Carbene Complexes for the
<i>N</i>
‐Alkylation of Amine Using the Green Hydrogen Borrowing Methodology
complexes [dichloro‐1‐[2‐(2‐ethoxyphenoxy)ethyl]‐3‐(3,5‐dimethylbenzyl)benzimidazol‐2‐ylidene}(p‐cymene) ruthenium(II)] has been established by single‐crystal X‐ray diffraction study, which revealed that the ruthenium atom adopt a classical piano‐stool coordination geometry. Under the optimised conditions, these ruthenium complexes were found to be efficient catalysts for N‐alkylation of aniline with arylmethyl
六个钌(II)配合物与一般分子式将[RuCl 2(NHC)(η 6 - p -cymene)](NHC = N-杂环卡宾)由转移金属化方法从将[RuCl合成2(η 6 - p - cymene)2和银(I)-NHC络合物。所有络合物均已通过分析和光谱方法(FT-IR,元素分析以及1 H和13 C NMR)进行了全面表征。钌配合物之一的固态结构[二氯-1- [2-(2-乙氧基苯氧基)乙基] -3-(3,5-二甲基苄基)苯并咪唑-2-亚基}(p[cymene)ruthenium(II)]是通过单晶X射线衍射研究建立的,该研究表明,钌原子采用经典的钢琴-凳子配位几何形状。在最优化的条件下,发现这些钌配合物是使用氢借用策略将苯胺与芳基甲醇进行N-烷基化的有效催化剂,这对于制备N-烷基化的胺是一种具有成本效益且对环境有吸引力的反应。
Palladium N-Heterocyclic Carbene
Catalysts for Synthesis of Diaryl Ethers
Novel functionalized 1,3-dialkylimidazolinium (LH) salts as precursors for N-heterocycliccarbenes (NHCs) have been prepared and successfully applied in the palladium-catalyzed synthesis of diaryl ethers and arylation ofbenzaldehydes. An efficient catalyst system was prepared in situ from Pd(OAc) 2 , 1,3-dialkylimidazolinium bromides (LHBr), and NaH.