Post-synthetic immobilization of palladium complexes on metal–organic frameworks – a new concept for the design of heterogeneous catalysts for Heck reactions

Abstract

Post-synthetic immobilization of palladium complexes on metal-organic frameworks-a new concept for the design of heterogeneous catalysts for Heck reactions3

Heterogeneous heck coupling in multivariate metal–organic frameworks for enhanced selectivity

“…Due to its outstanding stereoselectivity, Heck coupling is of particular interest in the pharmaceutical chemistry [18] and has been demonstrated in both homogeneous and heterogeneous systems previously, including other MOFs [19][20][21][22][23]. To highlight the advantage of combining the MTV approach with postmodification, we investigated the Heck coupling reaction for the synthesis of resveratrol trimethyl ether, a pharmaceutically relevant precursor.…”

Stepwise post‐modification immobilization of palladium Schiff‐base complex on to the OMS‐Cu (BDC) metal–organic framework for Mizoroki‐Heck cross‐coupling reaction

“…The Mizoroki‐Heck cross‐coupling reaction is one of the most commonly employed transformations for C‐C bond formation in modern organic synthesis and, because of the availability of reagents and the broad functional group tolerance of this transformation, it has found extensive use in synthetic organic chemistry . Several Pd supports on MOFs are currently reported for the catalysis of the Mizoroki‐Heck cross‐coupling reaction . A number of solid materials as supports have broadly been investigated for the immobilization of palladium, such as carbon nanotube, carbon nanofibers, N ‐doped carbon, grapheme, PMO, MCM‐41, SBA‐15, magnetic Fe 3 O 4 , metal oxides and polymers .…”

Post‐synthetic Modification of DUT‐5‐based Metal Organic Frameworks for the Generation of Single‐site Catalysts and their Application in Selective Epoxidation Reactions

“…Previous studies on palladium containing MIL‐53(Al) structure showed that the introduced palladium species in the framework strongly depended on the amount of the palladium precursor used during the modification process. To facilitate the desired formation of the metal complexes, only 0.9 equivalents of the metal precursor relative to the number of chelating groups were used, since larger amounts of the metal precursor led to the formation of undesired metal nanoparticles . Hence, the metal immobilization in this work was also performed with 0.9 equivalents of metal precursor with regard to the chelating group.…”

“…To facilitate the desired formation of the metal complexes, only 0.9 equivalents of the metal precursor relative to the number of chelating groups were used, since larger amounts of the metal precursor led to the formation of undesired metal nanoparticles. [12,13] Hence, the metal immobilization in this work was also performed with 0.9 equivalents of metal precursor with regard to the chelating group. The Co K-edge XANES spectrum of DUT-5-BPyDC(10)-Co ( Figure 3a) and the Mn K-edge XANES spectra of the manganese-containing DUT-5 materials (Figure 3b) revealed that the oxidation states of the incorporated metals in the MOF structure were the same as in the precursor salts, which were used for metal immobilization.…”