Synthesis and characterization of supramolecule grafted on modified magnetic nanoparticles: new hybrid organic–inorganic phase transfer catalyst

Abstract

In this study, for the first time, calix[4]resorcinarene was grafted on the silica-coated magnetic nanoparticles (MNPs-Si) which efficiently catalyze one-pot epoxide ring opening reaction in excellent yields in a very short reaction time. Various advantages associated with this protocol include simple workup procedure, short reaction times, and high product yields. High catalytic activity and ease of recovery, using an external magnetic field, are additional eco-friendly attributes of this catalytic system. Graphical abstractFeCl3 . 6H2O FeCl2 . 4H 2O 1) NH 3 / 90 °C / 1 h 2) Tetraethyl orthosilicate HO OH 4 4) O O Si O MNP O O A 3) A A O OH Si =A OH HO HO OH HO HO Si OMe MeO MeO Cl O O O

3D mesoporous polycalix-functionalized dual Brønsted–Lewis acidic double-charged DABCO-based ionic liquid: a powerful and recyclable supramolecular polymeric catalyst for the synthesis of spiro-fused[4H-pyran]

“…46,50 Different organic transformations have been carried out via functionalized PC4RA as a catalyst in the last decade, such as an expansion of triarylthiopyrylium salts, 42 xanthenes, 43,51 quick [3+2] Huisgen cycloaddition, 52 benzyl azide synthesis, 53 oxidation of benzyl alcohol, 54 phthalazine triones, 55 and epoxide ring opening. 56…”

“…46,50 Different organic transformations have been carried out via functionalized PC4RA as a catalyst in the last decade, such as an expansion of triarylthiopyrylium salts, 42 xanthenes, 43,51 quick [3+2] Huisgen cycloaddition, 52 benzyl azide synthesis, 53 oxidation of benzyl alcohol, 54 phthalazine triones, 55 and epoxide ring opening. 56 It is worth noting that polymers, in comparison with inorganic supports, have exhibited appreciable stability in acidic media, particularly porous polymers based on Cis-C4RA due to their cone-like cavities. Cavitands are composed of a fourfold aromatic ring enclosed by the hydrophilic group.…”

Design and synthesis of a magnetic hierarchical porous organic polymer: A new platform in heterogeneous phase‐transfer catalysis

“…Over recent years, magnetic separation as an attractive, easy and green technique in heterogeneous catalysis research area has been taken into more consideration in comparison with conventional separating methods like filtration or centrifugation, which avoids considerable loss of catalyst and increases the catalyst reusability . In this research and in the continuation of our previous reports for promoting efficient catalytic systems in performing various organic transformations, it was decided to investigate the synthetic applicability of a newly developed magnetic hierarchical porous organic polymer on the basis of calix[4]resorcinarene for the facile preparation of benzyl azides and cyanides in water by the nucleophilic substitution reaction.…”