[PdCl(allyl)]2 in the presence of K2CO3 afforded the anticipated NHC-ligated Pd(II) metalcomplexes in high yields. Further treatment of the latter complexes with tBuOK induced a deprotonation of the carbon atom adjacent to the phosphonium moiety and the formation of the corresponding C,C-chelating NHC-phosphonium ylide Pd(II) complexes. Investigation of an alternative synthetic route involving a silver transmetallation
Tethered NHC Ligands for Stereoselective Alkyne Semihydrogenations
作者:Felix Pape、Johannes Teichert
DOI:10.1055/s-0036-1590112
日期:2017.6
N-heterocyclic carbene (NHC) complexes have been investigated, leading to a highly Z-selective transformation. The catalyst is generated from inexpensive copper(I) chloride in situ and allows catalytic semihydrogenation down to 10 bar H2. A copper(I)-catalyzed semihydrogenation of internal alkynes has been developed. A variety of oxygen- and nitrogen-tethered N-heterocyclic carbene (NHC) complexes
摘要 已经开发了铜(I)催化的内部炔烃的半氢化反应。已经研究了多种氧和氮束缚的N-杂环卡宾(NHC)配合物,从而导致高度Z选择性的转化。该催化剂由廉价的原位氯化铜(I)生成,并允许低至10 bar H 2的催化半氢化作用。 已经开发了铜(I)催化的内部炔烃的半氢化反应。已经研究了多种氧和氮束缚的N-杂环卡宾(NHC)配合物,从而导致高度Z选择性的转化。该催化剂由廉价的原位氯化铜(I)生成,并允许低至10 bar H 2的催化半氢化作用。
Water-soluble NHC-Cu catalysts: applications in click chemistry, bioconjugation and mechanistic analysis
A series of novel bis(NHC) Cu(i) catalysts enables the production of triazoles with different substitution patterns and bioconjugation via “click” chemistry under homogeneous and/or heterogeneous catalytic conditions in aqueous media.
Dialkylgallium Complexes with Alkoxide and Aryloxide Ligands Possessing N-Heterocyclic Carbene Functionalities: Synthesis and Structure
作者:Paweł Horeglad、Osman Ablialimov、Grzegorz Szczepaniak、Anna Maria Dąbrowska、Maciej Dranka、Janusz Zachara
DOI:10.1021/om400863y
日期:2014.1.13
Methods for the synthesis of dialkylgalium compounds with alkoxide or aryloxide ligands possessing N-heterocyclic carbene functionalities have been established. As a result, the synthesis of a series of dialkylgallium complexes Me2Ga(O,C) (1, 3–5), and Me2Ga(O,C)·Me3Ga (2, 6) is described, where (O,C) represents an alkoxide or aryloxide monoanionic chelate ligand with an N-heterocyclic carbene functionality
flexible meta-xylyl unit. Carbene metalcomplexes of the proligand can be generated by direct metalation, transmetallation or base assisted metalation all of which lead to monodentate coordination modes of silver or iridium. Attempts at direct metalation using zirconium tetrakis-dimethylamide did not lead to complex formation but to the chloroform adduct or amide addition product. As yet, a method to generate