18102-76-6Relevant articles and documents
Elucidating the Importance of Hydrochloric Acid as a Cocatalyst for Resorcinarene-Capsule-Catalyzed Reactions
K?ster, Jesper M.,Tiefenbacher, Konrad
, p. 2941 - 2944 (2018)
This survey of resorcinarene-capsule-catalyzed reactions demonstrates that HCl functions as a crucial cocatalyst by increasing the capsule's inherent Br?nsted acidity to enable or accelerate cationic reactions. The presence of HCl appears to be without consequences for other reactions.
One-pot synthesis of 1- and 5-substituted 1H-tetrazoles using 1,4-dihydroxyanthraquinone–copper(II) supported on superparamagnetic Fe3O4@SiO2 magnetic porous nanospheres as a recyclable catalyst
Esmaeilpour, Mohsen,Javidi, Jaber,Zahmatkesh, Saeed
, p. 897 - 904 (2016/10/18)
An effective one-pot, convenient process for the synthesis of 1- and 5-substituted 1H-tetrazoles from nitriles and amines is described using1,4-dihydroxyanthraquinone–copper(II) supported on Fe3O4@SiO2 magnetic porous nanospheres as a novel recyclable catalyst. The application of this catalyst allows the synthesis of a variety of tetrazoles in good to excellent yields. The preparation of the magnetic nanocatalyst with core–shell structure is presented by using nano-Fe3O4 as the core, tetraethoxysilane as the silica source and poly(vinyl alcohol) as the surfactant, and then Fe3O4@SiO2 was coated with 1,4-dihydroxyanthraquinone–copper(II) nanoparticles. The new catalyst was characterized using Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, dynamic light scattering, thermogravimetric analysis, vibration sample magnetometry, X-ray photoelectron spectroscopy, nitrogen adsorption–desorption isotherm analysis and inductively coupled plasma analysis. This new procedure offers several advantages such as short reaction times, excellent yields, operational simplicity, practicability and applicability to various substrates and absence of any tedious workup or purification. In addition, the excellent catalytic performance, thermal stability and separation of the catalyst make it a good heterogeneous system and a useful alternative to other heterogeneous catalysts. Also, the catalyst could be magnetically separated and reused six times without significant loss of catalytic activity. Copyright
Indium triflate-catalyzed one-pot synthesis of 1-substituted-1H-1,2,3,4-tetrazoles under solvent-free conditions
Kundu, Dhiman,Majee, Adinath,Hajra, Alakananda
experimental part, p. 2668 - 2670 (2009/08/09)
A simple, efficient, and general method has been developed for the synthesis of 1-substituted-1H-1,2,3,4-tetrazoles via a three-component condensation of amine, trimethyl orthoformate, and sodium azide in presence of a catalytic amount of indium triflate
