Ullmann Ágnes (1927–2019)
نویسندگان
چکیده
منابع مشابه
The mechanism of the modified Ullmann reaction.
The copper-mediated aromatic nucleophilic substitution reactions developed by Fritz Ullmann and Irma Goldberg required stoichiometric amounts of copper and very high reaction temperatures. Recently, it was found that addition of relatively cheap ligands (diamines, aminoalcohols, diketones, diols) made these reactions truly catalytic, with catalyst amounts as low as 1 mol% or even lower. Since t...
متن کاملAu25 nanocluster-catalyzed Ullmann-type homocoupling reaction of aryl iodides.
The Au(25)(SR)(18)/CeO(2) nanocluster catalyst showed high activity in the homocoupling of aryl iodides (e.g. up to 99.8% yield with iodobenzene) and excellent recyclability.
متن کاملCopper in cross-coupling reactions The post-Ullmann chemistry
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متن کاملUllmann-type coupling of brominated tetrathienoanthracene on copper and silver.
We report the synthesis of extended two-dimensional organic networks on Cu(111), Ag(111), Cu(110), and Ag(110) from thiophene-based molecules. A combination of scanning tunnelling microscopy and X-ray photoemission spectroscopy yields insight into the reaction pathways from single molecules towards the formation of two-dimensional organometallic and polymeric structures via Ullmann reaction deh...
متن کاملReductive Ullmann Coupling of Aryl Halides by Palladium Nanoparticles Supported on Cellulose, a Recoverable Heterogeneous Catalyst
Palladium nanoparticles supported on cellulose were prepared without using any reducing agent and used as a highly efficient catalyst for the Ullmann reductive coupling of aryl halides in the presence of zinc, in a water-alcohol mixture as solvent in air. The obtained palladium nanoparticles were characterized by scanning electron microscopy (SEM), FTIR, thermogravimetric analysis (TGA) and ICP...
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ژورنال
عنوان ژورنال: Magyar Tudomány
سال: 2019
ISSN: 0025-0325
DOI: 10.1556/2065.180.2019.7.16