The asymmetric a-sulfenylation of Ni（II） complex of glycine with S-substituted 4-methylbenzenesulfonothioate is reported. Due to the mild and simple reaction conditions, this asymmetric reaction is compatible with v...The asymmetric a-sulfenylation of Ni（II） complex of glycine with S-substituted 4-methylbenzenesulfonothioate is reported. Due to the mild and simple reaction conditions, this asymmetric reaction is compatible with various functional groups.展开更多
Summary of main observation and conclusion 3-Olefinic oxindoles can undergo interrupted Morita-Baylis-Hillman reaction with formaldehyde. Apart from the previous reported dephosphoration to access reductive aldol-type...Summary of main observation and conclusion 3-Olefinic oxindoles can undergo interrupted Morita-Baylis-Hillman reaction with formaldehyde. Apart from the previous reported dephosphoration to access reductive aldol-type products, here we uncovered that completely different pathways were followed by tuning the substitutions of 3-olefinic oxin doles. In com bin ation with formalin, an unexpected domino phosphorus-ylide formation, aldol-type addition, hemeacetal formation and O-substitution process was observed to produce 1,3-dioxolane derivatives. Moreover, a switchable sequence to produce formate derivatives via a key hydride transfer process was furnished by simply replacing formalin with paraformaldehyde. Density functional theory calculations were conducted to well elucidate the catalytic reaction mechanism.展开更多
La0.67–xDyxPb0.33MnO3（x=0.00 and x=0.10） were elaborated by the solid state method and checked by X-ray diffraction. Close to magnetic temperature transition, the order transition and the critical behavior were inv...La0.67–xDyxPb0.33MnO3（x=0.00 and x=0.10） were elaborated by the solid state method and checked by X-ray diffraction. Close to magnetic temperature transition, the order transition and the critical behavior were investigated by dc magnetization measurements versus x composition. The critical properties were investigated through various techniques such as modified Arrott plot（MAP）, Kouvel-Fisher（KF） method and critical isotherm（CI） analysis based on the data of static magnetic measurements recorded around the Curie temperature TC. The values of critical exponents（β and γ） estimated were found to lie between those predicted for a 3D-Ising model for x=0.00 and those of 3D-Heisenberg model for x=0.10. The reliability of the critical exponent＇s values was confirmed by the Widom scaling relation and the universal scaling hypothesis. The change in the universality class should be due to the increase of the Dy content.展开更多
基金We gratefully acknowledge financial support from the National Natural Science Foundation of China （Nos. 81620108027, 21632008, 21472209, 21672231 and 81220108025）, the Major Project of Chinese National Programs for Fundamental Research and Development （No. 2015CB910304）, National S＆T Major Projects （No. 2014ZX09507002-001）, and the State Key Laboratory of Bioorganic Chemistry.
文摘The asymmetric a-sulfenylation of Ni（II） complex of glycine with S-substituted 4-methylbenzenesulfonothioate is reported. Due to the mild and simple reaction conditions, this asymmetric reaction is compatible with various functional groups.
文摘Summary of main observation and conclusion 3-Olefinic oxindoles can undergo interrupted Morita-Baylis-Hillman reaction with formaldehyde. Apart from the previous reported dephosphoration to access reductive aldol-type products, here we uncovered that completely different pathways were followed by tuning the substitutions of 3-olefinic oxin doles. In com bin ation with formalin, an unexpected domino phosphorus-ylide formation, aldol-type addition, hemeacetal formation and O-substitution process was observed to produce 1,3-dioxolane derivatives. Moreover, a switchable sequence to produce formate derivatives via a key hydride transfer process was furnished by simply replacing formalin with paraformaldehyde. Density functional theory calculations were conducted to well elucidate the catalytic reaction mechanism.
文摘La0.67–xDyxPb0.33MnO3（x=0.00 and x=0.10） were elaborated by the solid state method and checked by X-ray diffraction. Close to magnetic temperature transition, the order transition and the critical behavior were investigated by dc magnetization measurements versus x composition. The critical properties were investigated through various techniques such as modified Arrott plot（MAP）, Kouvel-Fisher（KF） method and critical isotherm（CI） analysis based on the data of static magnetic measurements recorded around the Curie temperature TC. The values of critical exponents（β and γ） estimated were found to lie between those predicted for a 3D-Ising model for x=0.00 and those of 3D-Heisenberg model for x=0.10. The reliability of the critical exponent＇s values was confirmed by the Widom scaling relation and the universal scaling hypothesis. The change in the universality class should be due to the increase of the Dy content.
