Investigation of prototypal MOFs consisting of polyhedral cages with accessible Lewis-acid sites for quinoline synthesis

Abstract

A series of prototypal metal-organic frameworks (MOFs) consisting of polyhedral cages with accessible Lewis-acid sites, have been systematically investigated for Friedländer annulation reaction, a straightforward approach to synthesizing quinoline and its derivatives. Amongst them MMCF-2 demonstrates significantly enhanced catalytic activity compared with the benchmark MOFs, HKUST-1 and MOF-505, as a result of a high-density of accessible Cu(II) Lewis acid sites and large window size in the cuboctahedral cage-based nanoreactor of MMCF-2.

Versatile Barium and Calcium Imidazolium‐Dicarboxylate Heterogeneous Catalysts in Quinoline Synthesis

“…For comparison, we considered the commercially available Cu‐BTC MOF (HKUST‐1, Basolite C‐300), which has been reported previously in the coupling of 2‐aminophenones and pentane‐2,4‐dione. The results, with HKUST‐1 catalyst, reported in the literature are somewhat different depending on the reaction conditions , . Therefore, we carried out the reaction with Cu‐BTC MOF under the reaction conditions recorded in Table , using conventional heating, obtaining quinoline 6 with 77 % conversion.…”

“…Copper‐MOF Basolite C‐300 (HKUST‐1) catalyzed the coupling between pentane‐2,4‐dione and 2‐aminobenzophenone or 2‐aminoacetophenone . Other copper‐based MOF, such as MOF‐505 and MMCF‐2, have also been shown to be active in the condensation between 2‐aminobenzophenone and pentane‐2,4‐dione or ethyl 3‐oxobutanoate . The concept of MOFs acting as heterogeneous catalysts in this transformation has just been shown, although the catalyst has a lack of versatility in terms of reactants.…”

Superior Activity of Isomorphously Substituted MOFs with MIL‐100(M=Al, Cr, Fe, In, Sc, V) Structure in the Prins Reaction: Impact of Metal Type

“…MOFs are formed by linking metal atoms or clusters with organic ligands to form porous 3 D organic–inorganic hybrid networks . In some MOFs, such as MOF‐74, MIL‐101, and MIL‐100, solvent molecules can be removed by thermal treatment to obtain coordinatively unsaturated cationic sites (CUSs), which can act as adsorption and catalytic active centers . Although MOFs based on divalent metal ions (Mg 2+ , Ni 2+ , Zn 2+ , Cu 2+ ) have received much attention in catalytic studies, only a few reports have been devoted to trivalent or tetravalent metal ions.…”

Investigation of Mn Promotion on HKUST‐1 Metal‐Organic Frameworks for Low‐Temperature Selective Catalytic Reduction of NO with NH3

“…The registered curves did not reveal any significant peak, which is in good agreement with the previously published reports on HKUST-1. [27,53] As a whole, the modification with Mn increased acidity of the catalysts, contributing to the enhanced catalytic performance in the NH 3 -SCR process. The loadings of 7.5 wt.% and 10.0 wt.% showed the same curves of NH 3 desorption, indicating that higher loading than the former does not have significant influence on the acidic properties.…”