Expanding applications of zeolite imidazolate frameworks in catalysis: synthesis of quinazolines using ZIF-67 as an efficient heterogeneous catalyst

Abstract

A cobalt zeolite imidazolate framework (ZIF-67) was successfully synthesized and characterized by several techniques. The ZIF-67 was used as an efficient heterogeneous catalyst for the cyclization reaction of 2aminobenzoketones and benzylamine derivatives to form quinazoline products. The optimal conditions involved the use of TBHP oxidant in toluene solvent at 80 C. Remarkably, the ZIF-67 catalyst exhibited better performance in the cyclization reaction than common cobalt salts such as Co(NO 3 ) 2 , CoCl 2 , and Co(OAc) 2 and other Co-MOFs such as ZIF-9, Co-MOF-74, and Co 2 (BDC) 2 (DABCO). In addition, the cyclization reaction could only proceed in the presence of the solid Co-ZIF catalyst and there was no contribution from leached active sites present in the solution. The catalyst could be recovered and reused several times without a significant degradation in catalytic activity.

Influence of the 2-methylimidazole/zinc nitrate hexahydrate molar ratio on the synthesis of zeolitic imidazolate framework-8 crystals at room temperature

“…ZIFs possess the unique properties of high crystallinity, large surface area, exceptional chemical and functional tunability. As a result, ZIFs have gained considerable attention for their potential application in gas storage 2 , CO 2 capture 3,4 , separation 5,6 , sensing 7 , catalysis 8 , drug delivery 9,10 and water treatment 11,12 . Zeolitic imidazolate framework-8 (ZIF-8), with sodalite (SOD) topology constructed from Zn and Hmim, is one of the most investigated ZIF materials 13–15 .…”

Fabrication of novel ZIF‐67 Composite Microspheres for Effective Adsorption and Solid‐phase Extraction of Dyes from Water

“…Figure a showed the XRD patterns of the above three samples. The main characteristic peaks of bare ZIF‐67 NPs matched well with those reported in the literature ,,, Some typical characteristic peaks of the XRD pattern for ZIF‐67 CMs were matched well with that of as synthesized ZIF‐67NPs.…”

“…ZIFs often possess unique properties of the microporosity, crystallinity, high specific surface areas, and high chemical and thermal stability, compared with other types of metal‐organic frameworks . Recently, ZIFs has attracted great attention in diverse applications, including liquid adsorption,, catalysis, and chemical analysis ,. It is reported that ZIFs can be used as adsorbents to absorb contaminants in water, such as dyes,, heavy metals salts,, and so on.…”

The ZIF-8 Based on Poly Microspheres as A Novel Adsorbent for Removing Organic Contaminants from Wastewater

“…Compared to other types of MOFs, ZIFs often exhibit unique properties of the microporosity, crystallinity, high surface area, and high chemical and thermal stability [4][5][6][7][8]. Recently, ZIFs has attracted considerable attention in diverse applications, including liquid adsorption [9,10], catalysis [11][12][13], and chemical analysis [14,15]. It has reported that ZIF-67 has been as an efficient heterogeneous catalyst for the cyclization reaction of 2-aminobenzoketones and benzylamine derivatives to form quinazoline products [13].…”

“…Recently, ZIFs has attracted considerable attention in diverse applications, including liquid adsorption [9,10], catalysis [11][12][13], and chemical analysis [14,15]. It has reported that ZIF-67 has been as an efficient heterogeneous catalyst for the cyclization reaction of 2-aminobenzoketones and benzylamine derivatives to form quinazoline products [13]. In addition, ZIF-67 was found to adsorptive remove phenol from aqueous system [16].…”