Keggin型过渡金属杂多配合物SiW_(11)M~(x-)(M=Mn~Ⅲ、Fe~Ⅲ、Co~Ⅲ)的稳定性、磁性及催化性能研究

合成了三价态过渡金属取代的钨硅杂多配合物αＳｉＷ１１Ｍｘ－（Ｍ＝ＭｎⅢ、ＦｅⅢ、ＣｏⅢ）的Ｋ（或Ｃｓ）盐，通过元素分析、红外、紫外、可见光谱、循环伏安等手段进行了表征．研究了配合物的热稳定性、水溶液中的酸碱稳定性、催化活性以及磁性，常温和变温（８２Ｋ～２７２Ｋ）磁化率数据表明配合物具有顺磁性特征．     

芳氧乙酸苯甲羰甲酯衍生物的研究

芳氧乙酸苯甲羰甲酯衍生物的研究史延年，方建新，李士明（南开大学元素有机化学研究所，天津，３０００７１）关键词ω－溴代苯乙酮，芳氧乙酸苯甲羰甲酯，合成，生物活性２，４－二氯苯氧乙酸及对氯苯氧乙酸作为有效的植物生长调节剂已得到广泛的应用．作者曾合成多种新...     

具有生物活性的有机磷化合物研究 Ⅳ.α-[(取代)苯并噻唑-2-氧代]烃基膦酸酯的合成和生物活性

以2-氯(取代)苯并噻唑和α-羟基烃基膦酸二乙酯为原料合成了8个标题化合物,收率为51%～95%,用元素分析,红外,核磁及质谱确定了结构,测定了它们的除草活性,并对结构和活性关系作了初步的讨论。     

Thermochemistry of substituted pyrroles

The heats of solution of a series of substituted pyrroles in benzene, carbon tetrachloride, chloroform, DMF, and pyridine were measured by a calorimetric method at 298.15 K. The influence of substituents in the pyrrole molecule on the energy parameters of solvation by organic solvents is discussed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 495–499, March, 1993.     

Complexation of selenium to (R)‐Rh2(MTPA)4: thermodynamics and stoichiometry

Variable‐temperature ¹H and ⁷⁷Se NMR data for 3‐phenylselenenyl‐1‐phenyl‐1‐propene (1) in the presence of Rh₂(MTPA)₄ (Rh*) prove that the equilibria are strongly shifted towards the adduct Rh*···1; free selenide molecules cannot be detected as long as uncomplexed rhodium atoms are available. In the case of excess Rh*, both 1 : 2 and 1 : 1 adducts (Rh* vs 1) are formed, and the latter is slightly favoured. With excess selenide, the system strongly favours the complexation of two selenide molecules (1 : 2 adduct), i.e. one at each rhodium atom. In this situation, intermolecular selenide exchange can be monitored by variable‐temperature ¹H NMR spectroscopy and the energy barrier is estimated to be 54–55 kJ mol^?1. Copyright © 2001 John Wiley & Sons, Ltd.     

A Convenient Synthesis of the Substituted 2,3—Diarylindole the Potent Selective COX—2 Inhibitors

Phenyl sulfone-containing 2,3-diarylindole derivatives were designed and indentified to be selective COX-2 inhibitors. A convenient synthetic route was also developed for the synthesis of the novel inhibitors.     

Stereoselective electrochemical transformation of 4-substituted cyclohexanones into cis-5-substituted 2,2-dimethoxycyclohexanols

Electrolysis of 4-substituted cyclohexanones in methanol in the presence of sodium halides as mediators in an undivided cell results in the stereoselective formation of cis-5-substituted 2,2-dimethoxycyclohexanols in 70—80% yields.