Abstract
An excellent conversions of benzaldehyde was obtained under solvent and solvent free conditions by utilizing Co(im)20.5 DMA as catalyst for the synthesis of benzylidene malononitrile. The catalytic prospect of this crystalline porous framework was extended to oxidation reactions involving ethylene glycol (EG) and ethylbenzene (EB). Unexpectedly, EG was totally oxidized to oxalic acid; which demonstrates the catalyst non-selectivity towards glycolic acid. For EB oxidation under a solvent less condition in the presence of oxygen as oxidant (0.8 Mpa), and a 42% conversion was achieved with 78.4% selectivity for acetophenone at 120°C for a period of 2 h. Key words: Metal-organic frameworks, zeolitic imidazolate frameworks, ethylene glycol, ethylbenzene.
Highlights
The phase after the substantial foundation of metalorganic frameworks (MOFs) synthetic chemistry is the utilization of its chemical versatility and functionality.MOFs have been identified for prospective applications in gas separation and storage, sensors, drug delivery and catalysis (Czaja et al, 2009; Yilmaz et al, 2011; Kuppler et al, 2009; Shekhah et al, 2011)
Ethylbenzene (98.50%) was used as obtained without any further purification, and the asynthesized catalyst with DMA guest molecule was exchanged by dichloromethane (DCM) (3 × 15 ml) for 3 days; thereafter the residual solvents were removed under vacuum at 200°C for 6 h
To achieve a selective oxidation of ethylene glycol to glycolic acid, noble metal such as Au, Ag and Pt can be incorporated into the porous frameworks as metal ions or supported on it, since noble metals have been demonstrated to be effective for the selective conversion of EG to glycolic acid (Biella et al, 2002; Berndt et al, 2003)
Summary
The phase after the substantial foundation of metalorganic frameworks (MOFs) synthetic chemistry is the utilization of its chemical versatility and functionality.MOFs have been identified for prospective applications in gas separation and storage, sensors, drug delivery and catalysis (Czaja et al, 2009; Yilmaz et al, 2011; Kuppler et al, 2009; Shekhah et al, 2011). After unassisted cooling to room temperature, the violet crystals were collected and washed with DMA (30 mL) with a yield of ~45% based on imidazolate ligand.
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