- Alkaline earth metal-based metal-organic framework: Hydrothermal synthesis, X-ray structure and heterogeneously catalyzed Claisen-Schmidt reaction
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Two alkaline earth metal-based carboxylate systems, [Mg(HL)(H 2O)2]n (1) and [Ca(H2L) 2]n (2) (H3L = chelidamic acid) have been hydrothermally synthesized, and characterized by single-crystal X-ray diffraction, IR, elemental analysis, and thermo-gravimetric analysis. Compound 1 has a 2D structure incorporating two water molecules. The dehydrated species, 1a, generated from 1 by removal of the coordinated water, has been characterized by thermo-gravimetric analysis, IR, elemental analysis and variable temperature powder X-ray diffraction. Both 1 and its dehydrated species 1a catalyze the Claisen-Schmidt reaction under heterogeneous conditions, but 1a is a more effective catalyst under environmentally friendly conditions. The catalyst can readily be recovered and reused in successive cycles without detectable loss of activity. Compound 2 has a 3D structure and is thermally stable up to 540 °C, but is inactive catalytically. This journal is the Partner Organisations 2014.
- Saha, Debraj,Maity, Tanmoy,Koner, Subratanath
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p. 13006 - 13017
(2014/08/18)
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- PAA-supported Hantzsch 1,4-dihydropyridine ester: An efficient catalyst for the hydrogenation of α,β-epoxy ketones
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A new type of water-soluble polymer-supported NADH co-enzyme model-PAA (polyacrylic acid)-supported Hantzsch 1,4-dihydropyridine ester (PAA-HEH) was designed and synthesized. Catalytic amount of the supported reagent was used in the hydrogenation of α,β-epoxy ketones to the corresponding β-hydroxy ketones and showed great catalytic efficiency in the reduction reaction. This PAA-HEH was an optimal potential for recycling use.
- Zhou, Xin-Feng,Wang, Peng-Fei,Geng, Ye,Xu, Hua-Jian
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supporting information
p. 5374 - 5377
(2013/09/12)
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- Biomimetic hydrogenation: A reusable NADH co-enzyme model for hydrogenation of α,β-epoxy ketones and 1,2-diketones
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A biomimetic method has been developed to transform α,β-epoxy ketones or 1,2-diketones into corresponding β-hydroxy ketones or α-hydroxy ketones using a catalytic amount of BNAH or BNA +Br-. The regeneration of BNAH or BNA+Br - is achieved by a mixture of HCOOH/Et3N. A radical mechanism is proposed to explain these observations.
- Huang, Qiang,Wu, Ji-Wei,Xu, Hua-Jian
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supporting information
p. 3877 - 3881
(2013/07/05)
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- Chemoselectivity in the reaction of 2-diazo-3-oxo-3-phenylpropanal with aldehydes and ketones
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The chemoselectivity in the reaction of 2-diazo-3-oxo-3-phenylpropanal (1) with aldehydes and ketones in the presence of Et3N was investigated. The results indicate that 1 reacts with aromatic aldehydes with weak electron-donating substituents and cyclic ketones under formation of 6-phenyl-4H-1,3-dioxin-4-one derivatives. However, it reacts with aromatic aldehydes with electron-withdrawing substituents to yield 1,3-diaryl-3-hydroxypropan-1-ones, accompanied by chalcone derivatives in some cases. It did not react with linear ketones, aliphatic aldehydes, and aromatic aldehydes with strong electron-donating substituents. A mechanism for the formation of 1,3-diaryl-3-hydroxypropan-1-ones and chalcone derivatives is proposed. We also tried to react 1 with other unsaturated compounds, including various olefins and nitriles, and cumulated unsaturated compounds, such as N,N′-dialkylcarbodiimines, phenyl isocyanate, isothiocyanate, and CS2. Only with N,N′-dialkylcarbodiimines, the expected cycloaddition took place. Copyright
- Zhang, Jiantao,Xu, Jiaxi
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p. 1733 - 1739
(2013/10/21)
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- A magnesium-based multifunctional metal-organic framework: Synthesis, thermally induced structural variation, selective gas adsorption, photoluminescence and heterogeneous catalytic study
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Three magnesium based carboxylate framework systems were prepared through a temperature-dependent synthesis. The compounds were synthesized by a hydrothermal method and characterized by single crystal X-ray diffraction analysis. A stepwise increase in the
- Saha, Debraj,Maity, Tanmoy,Das, Soma,Koner, Subratanath
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p. 13912 - 13922
(2013/09/24)
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- Magnetic nano-Fe3O4-supported 1-benzyl-1,4- dihydronicotinamide (BNAH): Synthesis and application in the catalytic reduction of α,β-epoxy ketones
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A novel magnetically recoverable organic hydride compound was successfully constructed by using silica-coated magnetic nanoparticles as a support. An as-prepared magnetic organic hydride compound, BNAH (1-benzyl-1,4- dihydronicotinamide), showed efficient activity in the catalytic reduction of α,β-epoxy ketones. After reaction, the magnetic nanoparticle- supported BNAH can be separated by simple magnetic separation which made the separation of the product easier.
- Xu, Hua-Jian,Wan, Xin,Shen, Yong-Ya,Xu, Song,Feng, Yi-Si
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supporting information; experimental part
p. 1210 - 1213
(2012/04/18)
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- Study on comparison of reducing ability of three organic hydride compounds
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Selective reduction of three kinds of substrates were studied to evaluate the reducing abilities of N,N-dimethyl-benzimidazolidine (DMBI), 2-phenylbenzimidazoline (PBI) and 2-phenylbenzothiazoline (PBT). As hydride donors, these three five-membered heterocyclic compounds performed different reducing abilities depending on the substrates.
- Feng, Yi-Si,Yang, Chun-Yan,Huang, Qiang,Xu, Hua-Jian
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experimental part
p. 5053 - 5059
(2012/07/28)
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- Catalytic hydrogenation of α,β-epoxy ketones to form β-hydroxy ketones mediated by an NADH coenzyme model
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The hydrogenation of α,β-epoxy ketones can be mediated by a catalytic amount of BNAH or BNA+Br- to form corresponding β-hydroxy ketones in high yield. Na2S2O4 is used as the reducing agent to convert
- Xu, Hua-Jian,Liu, You-Cheng,Fu, Yao,Wu, Yun-Dong
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p. 3449 - 3451
(2007/10/03)
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- Intermolecular aldol type reactions of phenacyl bromide with aldehydes mediated by active metallic indium in aqueous media
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Mediated by active metallic indium generated in situ from metallic samarium and InCl3.4H2O, phenacyl bromide and aldehydes smoothly underwent intermolecular aldol type reaction in aqueous media affording β-hydroxy ketones in good yie
- Wu, Huayue,Ding, Jinchang,Gao, Jing,Liu, Miaochang
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p. 724 - 725
(2007/10/03)
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- Samarium(II) diiodide-mediated intermolecular aldol type reactions of phenacyl bromides with carbonyl compounds
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Intermolecular aldol type reactions of phenacyl bromides with various carbonyl compounds mediated by samarium(II) diiodide afford β-hydroxy ketones in moderate to good yields.The addition of N,N,N',N'-tetramethylethylenediamine or diethylaluminium chlorid
- Aoyagi, Yutaka,Yoshimura, Mizue,Tsuda, Masako,Tsuchibuchi, Tomomasa,Kawamata, Saori,et al.
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p. 689 - 692
(2007/10/02)
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