The Clicked Pyridyl-Triazole Ligand: From Homogeneous to Robust, Recyclable Heterogeneous Mono- and Polymetallic Palladium Catalysts for Efficient Suzuki-Miyaura, Sonogashira, and Heck Reactions
Various mono‐ and polymetallic palladium complexes containing a 2‐pyridyl‐1,2,3‐triazole (pyta) ligand or a nonabranch‐derived (nonapyta) ligand have been synthesized by reaction of palladium acetate with these ligands according to a 1:1 metal‐ligand stoichiometry and used as catalysts for carbon‐carbon cross‐coupling including the Suzuki–Miyaura, Sonogashira and Heckreactions. The unsubstituted monopalladium
quest for general and efficient synthetic procedures for dendrons and dendrimers, allylphenol, allylnaphthol and 6-bromonaphthalene AB3 dendrons have been successfully prepared on a large-scale by a rapid and clean route starting from commercially available esters and allyl bromide. In contrast to the known organoiron strategy, the above-mentioned methodology enables the large-scale synthesis of AB3 dendrons
New Polyalkynyl Dendrons and Dendrimers: “Click” Chemistry with Azidomethylferrocene and Specific Anion and Cation Electrochemical Sensing Properties of the 1,2,3-Triazole-Containing Dendrimers
Dendrimers for ion sensing: The synthesis and use of new tris‐alkynyl dendrons are reported. So‐called “click” reactions of the dendrimers described with azidomethylferrocene give 27‐ferrocenyl, 81‐ferrocenyl, and 243‐ferrocenyldendrimers. Electrochemical recognition of oxo‐anions and Pd2+ cations has been compared using the three polyferrocenyl dendrimers.
“Click” Dendrimers: Synthesis, Redox Sensing of Pd(OAc)<sub>2</sub>, and Remarkable Catalytic Hydrogenation Activity of Precise Pd Nanoparticles Stabilized by 1,2,3-Triazole-Containing Dendrimers
methanol yields Pdnanoparticles (PdNPs) that are stabilized either by several dendrimers (G0, DSN) or by encapsulation inside a dendrimer (G1 and G2: DEN), as confirmed by TEM. Relative to PAMAM-DENs (PAMAM=poly(amidoamine)), the "click" DSNs and DENs show a remarkable efficiency and stability for olefin hydrogenation under ambient conditions of various substrates. The influence of the reductant of PdII
Cross Olefin Metathesis for the Selective Functionalization, Ferrocenylation, and Solubilization in Water of Olefin-Terminated Dendrimers, Polymers, and Gold Nanoparticles and for a Divergent Dendrimer Construction
and polyferrocenyl structures from polyolefins. Crossmetathesis is also used to efficiently achieve an iterative divergent dendritic construction. All the crossmetathesis reactions were monitored by 1H NMR showing the chemo-, regio-, and stereoselectivity. MALDI-TOF mass spectrometry was a very useful technique to confirm the efficiency of this synthetic strategy.
使用第二代 Grubbs 催化剂,烯烃交叉复分解用于有效地功能化聚烯烃树枝状聚合物、聚合物和金纳米颗粒。在这些结构中,系链被加长以防止容易的交叉复分解,否则在具有短系链的聚烯烃树枝状聚合物中占主导地位。这种合成策略允许从聚烯烃中一步获得多元酸、聚酯和聚二茂铁结构。交叉复分解也用于有效地实现迭代发散树突结构。所有交叉复分解反应均通过 1 H NMR 监测,显示化学选择性、区域选择性和立体选择性。MALDI-TOF 质谱法是一种非常有用的技术,可以确认这种合成策略的效率。