Covalently immobilized indium(III) composite (In/SiO2) as highly efficient reusable catalyst for A3-coupling of aldehydes, alkynes and amines under solvent-free conditions

Autor:	Paulo H. Schneider, Raoni S. Rambo, Edilson Valmir Benvenutti, Dennis Russowsky, Cátia S. Radatz, Daniel S. Rampon, Tiago Lima da Silva
Rok vydání:	2015
Předmět:	Chemistry Process Chemistry and Technology Composite number Inorganic chemistry chemistry.chemical_element Heterogeneous catalysis Catalysis Adsorption X-ray photoelectron spectroscopy Covalent bond Desorption Physical and Theoretical Chemistry Indium
Zdroj:	Journal of Molecular Catalysis A: Chemical. 399:71-78
ISSN:	1381-1169
DOI:	10.1016/j.molcata.2015.01.021
Popis:	We describe the synthesis and application of a silica-xerogel-supported indium(III) composite (In/SiO2). Using X-ray photoelectron spectroscopy, by the first time it was possible to identify that the indium is bonded to the silica through covalent In O Si bonds. The N2 adsorption/desorption isotherms revealed that the In/SiO2 composite presents pores with diameters between 1 and 4 nm, which allows it to be used as a heterogeneous catalyst. Thus, this composite was used as catalyst in an A3-coupling reaction with several aldehydes, amines and acetylenes, leading to the formation of propargylamines in good-to-excellent yields in solvent-free conditions, using both conventional heating and microwave irradiation (MW). The recyclability was evaluated under both conditions and no considerable reduction in the yields was observed after four cycles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c8d9ad2f3d2664c8e98a171459788e00 https://doi.org/10.1016/j.molcata.2015.01.021 Zobrazit plný text záznamu Full Text from ScienceDirect