A solid acid catalyst has been prepared by grafting Boron trifluoride on mesoporous molecular sieve MCM 41 and characterized by XRD and FTIR techniques. The XRD and FTIR results indicated that the BF 3·Et 2O inte...A solid acid catalyst has been prepared by grafting Boron trifluoride on mesoporous molecular sieve MCM 41 and characterized by XRD and FTIR techniques. The XRD and FTIR results indicated that the BF 3·Et 2O interlocks with the silicon groups of MCM 41 surface to form strong solid acid. The solid acid catalyst would effectively promote the opening of epichlorohydrin with isobutanol to form 1 isobutoxy 3 chloropropanol, and showed a nice activity and selectivity.展开更多
A new trithiocarbonato Mo complex(Et_4N)_2[(S_2)Mo2O_2(μ-S)_2(CS_3)]was obtained from a system containing MoO_4^(2-),S_x^(2-),and CS_2 and characterized by IR and X-ray structural analysis. The complex crystallizes i...A new trithiocarbonato Mo complex(Et_4N)_2[(S_2)Mo2O_2(μ-S)_2(CS_3)]was obtained from a system containing MoO_4^(2-),S_x^(2-),and CS_2 and characterized by IR and X-ray structural analysis. The complex crystallizes in the (?)onoclinic space group P2_1/c with a=9.539(3)(?), b=20.745(2)(?),c=15.452(2)(?),β=94.58(2)°,and Z=4.The structure was solved by direct and difference Fourier synthesis methods.Least squares refinement using 2910 reflections with I>3σ(I)converged to R=0.054.The CS_3^(2-) iigand in the complex chelates to Mo atom and values of the C-S bond distances in the CS_3^(2-) ligend indicate a substantial contribution of three resonance forms.展开更多
Homoisoflavonoids are in the subclass of the larger family of flavonoids having one more alkyl carbon than flavonoids. Among them, 8-C-Methylated homoisoflavones have not been extensively studied for synthesis and bio...Homoisoflavonoids are in the subclass of the larger family of flavonoids having one more alkyl carbon than flavonoids. Among them, 8-C-Methylated homoisoflavones have not been extensively studied for synthesis and biological evaluation. Author’s current objective is to synthesize 8-C-Methylated homoisoflavones by the reaction of 3-C-methylated dihydrochalcones with N,N’-dimethyl (chloromethylene) ammonium chloride generated<em> in situ</em> from DMF and PCl<sub>5</sub> for one carbon extension at about room temperature. The 3-C-methylated dihydrochalcones were synthesized by the reduction of 3-C-methylated chalcones, which were prepared from 3-C-methylated acetophenones and aromatic aldehydes in the presence of base. All the synthesized novel homoisoflavones’s structures were characterized by NMR and Tandem Mass Spectrometry.展开更多
Practical BF3.Et20 catalyzed reactions between indoles and a series of carbonyl compounds at room temperature are described, which afford bis（indolyl）methanes with isolated yields up to 96%,
The title compound was prepared by dissolving 1.3g MoCl3·3H2O into 20 ml anhydrous formic acid. The solution was then heated and refluxed for half an hour. After cooling a bit, 20ml anhydrous ethanol saturated wi...The title compound was prepared by dissolving 1.3g MoCl3·3H2O into 20 ml anhydrous formic acid. The solution was then heated and refluxed for half an hour. After cooling a bit, 20ml anhydrous ethanol saturated with HCl and 0.5g （Et4N）I were added to the solution. The brown twin crystals were crystallized in three days. The formula of the product was confirmed by elemental chemical analysis. Found: Mo, 36.09; Cl, 26.84; C, 15.19; H, 3.54; N, 1.76. Calcd: Mo, 36.82; Cl, 27.21; C, 16.90; H, 2.97; N, 1.79. Diffraction work of a selected twin展开更多
Vilsmeier reagent formed from phthaloyl dichloride and DMF was found to be very effective for converting 2-hydroxyacetophenones, deoxybenzoins and dihydrochalcones into corresponding chromones, isoflavones and homoiso...Vilsmeier reagent formed from phthaloyl dichloride and DMF was found to be very effective for converting 2-hydroxyacetophenones, deoxybenzoins and dihydrochalcones into corresponding chromones, isoflavones and homoisoflavones with excellent yield. This method offers significant advantages such as efficiency and mild reaction conditions with shorter reaction time.展开更多
文摘A solid acid catalyst has been prepared by grafting Boron trifluoride on mesoporous molecular sieve MCM 41 and characterized by XRD and FTIR techniques. The XRD and FTIR results indicated that the BF 3·Et 2O interlocks with the silicon groups of MCM 41 surface to form strong solid acid. The solid acid catalyst would effectively promote the opening of epichlorohydrin with isobutanol to form 1 isobutoxy 3 chloropropanol, and showed a nice activity and selectivity.
文摘A new trithiocarbonato Mo complex(Et_4N)_2[(S_2)Mo2O_2(μ-S)_2(CS_3)]was obtained from a system containing MoO_4^(2-),S_x^(2-),and CS_2 and characterized by IR and X-ray structural analysis. The complex crystallizes in the (?)onoclinic space group P2_1/c with a=9.539(3)(?), b=20.745(2)(?),c=15.452(2)(?),β=94.58(2)°,and Z=4.The structure was solved by direct and difference Fourier synthesis methods.Least squares refinement using 2910 reflections with I>3σ(I)converged to R=0.054.The CS_3^(2-) iigand in the complex chelates to Mo atom and values of the C-S bond distances in the CS_3^(2-) ligend indicate a substantial contribution of three resonance forms.
文摘Homoisoflavonoids are in the subclass of the larger family of flavonoids having one more alkyl carbon than flavonoids. Among them, 8-C-Methylated homoisoflavones have not been extensively studied for synthesis and biological evaluation. Author’s current objective is to synthesize 8-C-Methylated homoisoflavones by the reaction of 3-C-methylated dihydrochalcones with N,N’-dimethyl (chloromethylene) ammonium chloride generated<em> in situ</em> from DMF and PCl<sub>5</sub> for one carbon extension at about room temperature. The 3-C-methylated dihydrochalcones were synthesized by the reduction of 3-C-methylated chalcones, which were prepared from 3-C-methylated acetophenones and aromatic aldehydes in the presence of base. All the synthesized novel homoisoflavones’s structures were characterized by NMR and Tandem Mass Spectrometry.
基金fundings from the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, Partenariats Hubert Curien Xu Guangqi 2012 (No. 27967RE)Fundamental Research Funds for the Central Universities (Nos. CDJRC10220004 and CDJZR11220005)Natural Science Foundation Project of CQ CSTC (Nos. 2010BB5064 and cstc2013jcyjA0217) for financial support
文摘Practical BF3.Et20 catalyzed reactions between indoles and a series of carbonyl compounds at room temperature are described, which afford bis（indolyl）methanes with isolated yields up to 96%,
文摘The title compound was prepared by dissolving 1.3g MoCl3·3H2O into 20 ml anhydrous formic acid. The solution was then heated and refluxed for half an hour. After cooling a bit, 20ml anhydrous ethanol saturated with HCl and 0.5g （Et4N）I were added to the solution. The brown twin crystals were crystallized in three days. The formula of the product was confirmed by elemental chemical analysis. Found: Mo, 36.09; Cl, 26.84; C, 15.19; H, 3.54; N, 1.76. Calcd: Mo, 36.82; Cl, 27.21; C, 16.90; H, 2.97; N, 1.79. Diffraction work of a selected twin
文摘Vilsmeier reagent formed from phthaloyl dichloride and DMF was found to be very effective for converting 2-hydroxyacetophenones, deoxybenzoins and dihydrochalcones into corresponding chromones, isoflavones and homoisoflavones with excellent yield. This method offers significant advantages such as efficiency and mild reaction conditions with shorter reaction time.
