Home About us Contact
|
Home About us Contact | ||
|
|
||
Heterogeneous Palladium Catalysts (heterogeneous + palladium_catalyst)
Selected AbstractsA Highly Active Heterogeneous Palladium Catalyst for the Suzuki,Miyaura and Ullmann Coupling Reactions of Aryl Chlorides in Aqueous Media,ANGEWANDTE CHEMIE, Issue 24 2010Bizhen Yuan Ein Palladium-Heterogenkatalysator mit dem Metall-organischen Gerüst MIL-101 als Träger vermittelt effiziente Kupplungen in Wasser; so lieferten Suzuki-Miyaura-Kreuzkupplungen und Ullmann-Homokupplungen von substituierten Arylchloriden hohe Ausbeuten. Der Katalysator lässt sich darüber hinaus leicht zurückgewinnen und wiederverwenden (siehe Bild; Cr,blau, O,rot, C,weiß). [source] Recyclable Heterogeneous Palladium Catalysts in Pure Water: Sustainable Developments in Suzuki, Heck, Sonogashira and Tsuji,Trost ReactionsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1 2010Marc Lamblin Abstract This review summarizes the progress made essentially these last ten years on heterogeneous palladium catalysis in pure water. The work covers four important palladium-catalyzed transformations for carbon-carbon bond formation: Suzuki, Heck, Sonogashira and Tsuji,Trost reactions. The discussion focuses on the efficiency and reusability of the heterogeneous catalysts as well as on the experimental conditions from a sustainable chemistry point of view. The review is introduced by a discussion on mechanistic aspects inherent to heterogeneous catalysis. [source] Heterogeneous Palladium Catalysts for a New One-Pot Chemical Route in the Synthesis of Fragrances Based on the Heck ReactionADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2007Maria Jose Climent Abstract The one-pot synthesis of the fragrance 4-(p -methoxyphenyl)butan-2-one, with raspberry scent, has been carried out using palladium on different supports such as magnesium oxide (MgO), hydrotalcite, hydroxyapatite (HA), aluminium oxide (,-Al2O3) and titanium dioxide (TiO2). The first pathway consists of a Heck coupling between 4-methoxyiodoanisole and methyl vinyl ketone followed by hydrogenation. Palladium supported on titanium dioxide showed the best performance for carrying out both consecutive steps giving 4-(p -methoxyphenyl)butan-2-one with high yields and selectivity. The Pd-TiO2 catalyst is more active than a homogeneous palladium complex that is well accepted in the literature as being highly active for performing Heck reactions. [source] The Polymer Incarcerated Method for the Preparation of Highly Active Heterogeneous Palladium Catalysts.CHEMINFORM, Issue 29 2003Ryo Akiyama Abstract For Abstract see ChemInform Abstract in Full Text. [source] Development of Molecular Sieves-Supported Palladium Catalyst and Chemoselective Hydrogenation of Unsaturated Bonds in the Presence of Nitro GroupsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2009Tomohiro Maegawa Abstract The chemoselective hydrogenation of unsaturated bonds and azide functionalities is achieved in the presence of nitro groups by a heterogeneous palladium catalyst supported on molecular sieves (MS3A). The present method shows a wide-range of applicability with regard to substrates and the catalyst can be easily prepared and reused at least three times without any loss of activity. [source] First Heterogeneous Ligand- and Salt-Free Larock Indole SynthesisADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2009Nelly Batail Abstract A new ligand- and salt-free procedure using heterogeneous palladium catalysts for the Larock indole and benzofuran synthesis is reported. After optimisation of the reaction conditions, good to high isolated yields have been achieved for a variety of structures. Recycling studies have shown that the palladium catalysts can be readily recovered and reused. Reactions and recovery of the palladium catalysts can be carried out in the presence of air, without any particular precaution. [source] | ||||||||||