3D-network porous polymer based on calix[4]resorcinarenes as an efficient phase transfer catalyst in regioselective conversion of epoxides to azidohydrins

Design and synthesis of a new porous organic polymer equipped with N‐propyl sulfamic acid functionalities: As an efficient heterogeneous catalyst for the synthesis of 1,8‐dioxo‐octahydroxanthene derivatives

“…As illustrated in Scheme , this newly synthesized N‐propyl sulfamic acid functionalized polymeric catalyst preparation steps include the synthesis of calix[4]resorcinarene (1) as the result of the reaction between resorcinol and acetaldehyde , polymerization with formaldehyde to develop product (2) , modification with APTES resulting in structure (3) and finally product (4) formation through the addition of chlorosulfonic acid (Scheme ). Formation of these products (1, 2, and 3) was proved using a series of spectroscopic analysis (see ESI). In the following the developed catalyst will be characterized via various techniques.…”

“…The ability of these systems for being incorporated to various substrates like neutral molecules, cations, and also linking agents make them known as appropriate candidates in heterogeneous catalysis . In this regard, special attention has been given to the cross‐linked polymers based on calix[4]resorcinarene by this research group as a proper porous material capable of undergoing the post‐functionalization process. This nanoporous polymeric structure consisting of calix[4]resorcinarene monomeric units provides a proper bed for the reaction precession.…”

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

“…In this context and in continuation of our previous studies [18][19][20], a heterogeneous catalyst has recently been developed based on calix [4]resorcinarene immobilized on silica-coated magnetic nanoparticles as an efficient phasetransfer catalyst in the synthesis of azidohydrins. Although a variety of new and mild procedures to effect this transformation have been reported, most of them have some limitations [21].…”

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.…”