A novel, efficient, and environmentally friendly method for the synthesis of polyhydroquinoline derivatives by a one‐pot, four‐component unsymmetrical Hantzsch condensation of dimedone, aldehydes, ethyl acetoacetate...A novel, efficient, and environmentally friendly method for the synthesis of polyhydroquinoline derivatives by a one‐pot, four‐component unsymmetrical Hantzsch condensation of dimedone, aldehydes, ethyl acetoacetate, and ammonium acetate in the presence of a catalytic amount of tetrabutylammonium hexatungstate [TBA]2[W6O19] under solvent‐free conditions has been developed. The results showed that this heterogeneous catalyst has high catalytic activity and the desired products were obtained in good to high yields. Moreover, the catalyst was found to be reusable and considerable catalytic activity was still achieved after the fifth run.展开更多
A novel isopolyanion salt [(CH 3Py) 2H] 2W 6O 19 was synthesized by the reaction of a white powdery tungstic acid (WPTA) with p methylpyridine, and characterized by elemental analyses, infrared spectrometry and X ray ...A novel isopolyanion salt [(CH 3Py) 2H] 2W 6O 19 was synthesized by the reaction of a white powdery tungstic acid (WPTA) with p methylpyridine, and characterized by elemental analyses, infrared spectrometry and X ray diffraction methods. In the crystal structure of the title compound there are a hexatungstate anion and two unique [(CH 3Py) 2H] + dimeric cations, and the most specific aspect of its structure is the first reported hydrogen bond existing between two of the p methylpyridine molecules with a N_N distance of 0.267 3 nm. This hydrogen bond is analogous to that between the water molecules in H 5O 2 +, but is rather weaker.展开更多
The title compound bis（1,3-diisopropyl-4,5-dimethylimidazolium） hexatungstate,[C11H21N2]2[W6O19],was synthesized and characterized by single-crystal X-ray diffraction,IR and elemental analysis.It crystallizes in the...The title compound bis（1,3-diisopropyl-4,5-dimethylimidazolium） hexatungstate,[C11H21N2]2[W6O19],was synthesized and characterized by single-crystal X-ray diffraction,IR and elemental analysis.It crystallizes in the monoclinic system,space group P21/n with a=1.112 84（14）,b=1.283 84（17）,c=1.293 28（17）nm,β=96.410（2）°,V=1.836 2（4）nm^3,C22H42N4O19W6,Mr=1 769.70,Dc=3.201 g/cm3,F（000）=1 596,Z=2,μ（Mo Kα）=18.797 mm-1,the final R=0.031 3,wR=0.059 8for observed reflections（I〉2σ（I））.展开更多
基金supported by Islamic Azad University, Mashhad Branch, Iran
文摘A novel, efficient, and environmentally friendly method for the synthesis of polyhydroquinoline derivatives by a one‐pot, four‐component unsymmetrical Hantzsch condensation of dimedone, aldehydes, ethyl acetoacetate, and ammonium acetate in the presence of a catalytic amount of tetrabutylammonium hexatungstate [TBA]2[W6O19] under solvent‐free conditions has been developed. The results showed that this heterogeneous catalyst has high catalytic activity and the desired products were obtained in good to high yields. Moreover, the catalyst was found to be reusable and considerable catalytic activity was still achieved after the fifth run.
文摘A novel isopolyanion salt [(CH 3Py) 2H] 2W 6O 19 was synthesized by the reaction of a white powdery tungstic acid (WPTA) with p methylpyridine, and characterized by elemental analyses, infrared spectrometry and X ray diffraction methods. In the crystal structure of the title compound there are a hexatungstate anion and two unique [(CH 3Py) 2H] + dimeric cations, and the most specific aspect of its structure is the first reported hydrogen bond existing between two of the p methylpyridine molecules with a N_N distance of 0.267 3 nm. This hydrogen bond is analogous to that between the water molecules in H 5O 2 +, but is rather weaker.
基金Supported by the Beijing Higher Education Young Elite Teacher Project(YETP1191)
文摘The title compound bis（1,3-diisopropyl-4,5-dimethylimidazolium） hexatungstate,[C11H21N2]2[W6O19],was synthesized and characterized by single-crystal X-ray diffraction,IR and elemental analysis.It crystallizes in the monoclinic system,space group P21/n with a=1.112 84（14）,b=1.283 84（17）,c=1.293 28（17）nm,β=96.410（2）°,V=1.836 2（4）nm^3,C22H42N4O19W6,Mr=1 769.70,Dc=3.201 g/cm3,F（000）=1 596,Z=2,μ（Mo Kα）=18.797 mm-1,the final R=0.031 3,wR=0.059 8for observed reflections（I〉2σ（I））.
