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Heterogeneous Organocatalysts Based on a Triazine‐Triazole Silane Ligand
Author(s) -
Cruz Paula,
Pérez Yolanda,
del Hierro Isabel
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800885
Subject(s) - tetraethyl orthosilicate , chemistry , knoevenagel condensation , mesoporous silica , silane , mesoporous material , magnetic nanoparticles , triethoxysilane , infrared spectroscopy , fourier transform infrared spectroscopy , bromide , nanoparticle , nuclear chemistry , catalysis , organic chemistry , chemical engineering , engineering
Robust and non‐air‐sensitive metal‐free triazine‐triazole heterogeneous organocatalysts were prepared. The synthetic procedure involved the co‐condensation of a bridged tris silane precursor with tetraethyl orthosilicate (TEOS) in the presence of cetyltrimethylammonium bromide (CTAB). In addition, the silane precursor was anchored post‐synthesis onto mesoporous silica nanoparticles and used to stabilize magnetic nanoparticles. The organocatalysts were characterized by X‐ray diffraction (XRD), X‐ray fluorescence (XRF), N 2 adsorption‐desorption, transmission electron microscopy (TEM), solid‐state nuclear magnetic resonance spectroscopy (CP‐MAS‐NMR), Fourier‐transform infrared spectroscopy (FT‐IR), and UV/Vis diffuse reflectance spectroscopy (DRUV/Vis). All materials, recoverable and recyclable, possess good catalytic activity in Knoevenagel condensation and in the one‐pot three‐component reaction for the synthesis of 2‐amino‐chromene derivatives under mild conditions.