cis,trans-1,5-Cyclodecadiene—Sulfur Dioxide Copolymer

An alternating linear copolymer of cis,trans-1,5-cyclodecadiene and sulfur dioxide has been prepared in quantitative yield. Transannular carbon-carbon bond formation gives four saturated carbon atoms between the sulfone groups. The polymer is resistant to alkali but degrades thermally above 150°C with random chain cleavage.     

Planar Chromatography of Cholic Acid-Derived cis—trans Isomeric bis-Steroidal Tetraoxanes

JPC – Journal of Planar Chromatography – Modern TLC - Seven pairs of cis—trans isomers of bis-steroidal tetraoxanes have been examined by both normal-phase (NP) and reversed-phase...     

Crystal Structure and EPR Spectra of cis—Dioxo—molybdenum（V） Complex with o—Aminophenol

ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｌｙｂｄｅｎｕｍｉｓｗｉｄｅｌｙｕｓｅｄｉｎｂｉｏｌｏｇｉｃａｌｓｙｓｔｅｍｓｄｕｅｔｏｔｈｅｔｗｏｂａｓｉｃｆｏｒｍｓ :ｎｉｔｒｏｇｅｎａｓｅｓａｎｄｏｘｏｔｒａｎｓｆｅｒａｓｅｓｏｒｏｘｏｍｏｌｙｂｄｏｅｎｚｙｍｅｓ .Ｔｈｅｌａｔｔｅｒａｓｔｈｅｍｏｎｏｎｕｃｌｅａｒａｃｔｉｖｅｓｉｔｅｓｏｆａｍｕｃｈｍｏｒｅｄｉｖｅｒｓｅｇｒｏｕｐｏｆｅｎｚｙｍｅｓｉｎｇｅｎｅｒａｌｆｕｎｃｔｉｏｎｃａｔａｌｙｔｉｃａｌｌｙｔｒａｎｓｆｅｒａｎｏｘｙｇｅｎａｔｏｍｅｉｔｈｅｒｔ…     

Crystal Structure of cis—2—[P,P—Diethoxy） phosphono（m—nitro）benzyloxy]

The crystal structure of the title compound cis-2-[(P, P-Diethoxy)phosphono(m-nitro)benzyloxy]-4-Phenyl-5,5-Dimethyl-1,3,2-Dioxaphosphorinane 2-Sulfide, C22H29NO8P2S, was determined by single crystal X-ray diffraction. It crystallizes in the monoclinic system, space group P21/c, with Mr=529.49, a=9.888(2), b=20.831(4), c=12.797(3) , β=94.42(3)°, V=2628(1) 3, Z=4, Dx=1.338 g/cm3, λ=0.71073, μ=0.2796 mm-1 and F(000)=556. The structure was solved by direct methods. The final R factor is 0.052 and Rw is 0.057 for 1793 unique observed reflections [I≥3σ(I)]. A cis-configuration and a preferred chair conformation for the molecule have been established by X-ray diffraction analysis. The results presented also give a good explanation to the correlation between the configurational assignments and the regularity in the chemical shifts of C4-H and 31P NMR.     

Synthesis and Crystal structure of cis—Dichloro—（tetrakis（methylthio）—ethylene）Palladium（Ⅱ）

1 INTRODUCTION Recently much more attention has been paid to palladium bidentate chelate. Such as palladium diphosphino complexes can be used to catalyze crossing-coupling[1] and monocoupling[2]; palladium diamine complexes can be used to catalyze norbornene polymerization[3] and it can also bind to biologically important molecules[4]. Owing to the above reasons, palladium(Ⅱ) complexes with these ligainds are well researched. However, the neutral analogs with derivatives of dithiole are…     

CRYSTAL AND MOLECULAR STRUCTURE OF cis—（μ—PhS—（CH2）3SPh）PdCl2

<正> The title complex, C15S2Cl2H16Pd, Mr = 437. 73, crystallizes in monoclinic space group P21/c with a = 10. 177(2), b=10. 788(1), c= 15. 305(1) (?),β=102. 73(1)°, V = 1638. 1(?)3, Z = 4, Dx =1.77g/cm3, μ = 16.8cm-1, F (000) = 872. The final structure refinement converged with unweighted and weighted R factors of 0. 025 and 0. 033 for 2490 observed unique reflections. The complex has mononuclear structure with the ligand cis-chelated to the Pd(Ⅱ) atom.     

cis—Mo(DMF)_3Br_3异构体的晶体和分子结构

制得了cis—Mo(DMF)_3Br_3(DMF指N,N—二甲基甲酰胺)的一种异构体并用X射线三维衍射数据进行了晶体结构测定。晶体的空间群属Pca2_1。晶胞大小为a=20.157(4),b=13.950(4),c=13.142(4)。晶体的测量密度为2.02g/cm~3,与Z=8相符。结构用直接法-Fourier合成法解得,最终R因子为0.060。结构分析表明,晶体仍为cis-Mo(DMF)_3Br_3,分子中Mo周围的三个Br原子和三个DMF配位基的O原子仍按顺式排列成近八面体,但DMF的取向不规则。分子不再具有对称性。     

Synthesis and Crystal Structure of cis—[meso—1,3—Bis（propylsulfinyl）propane]dichloroplatinum（Ⅱ）

1 INTRODUCTION A number of Pt complexes with monosulfoxide have been isolated and characterized[1]. It was indicated that the sulfoxide group trends to coordinate to soft metals (Pt, Pd, etc.) by its sulfur atom[2]. Pt(Ⅱ) trends to bond to disulfoxides in cis-mode and such complexes have potential antitumor activity[2]. However, only few examples of such complexes have been structurally characterized[3]. We will report herein the crystal structure of a new Pt(Ⅱ) complex with a disulf…     

NMR MICROSCOPY OF γ-IRRADIATED cis 1.4-POLYBUTADIENE

NMR microscopy has received great attention from various fields of research, especiallymaterial science by its possibility to study materials directly without destruction. Althoughthis technique is almost limited to the detection of fluids constricted in solid samples, suchas water in biological systems, solvent diffused in a polymer material~1 and liquid saturatedrock systems~2, the mechanical defects of high elastic rubbers have also been detected~3We are extending this technique to the direct study of the effect of y-irradiation on cis1, 4-polybutadiene (PB). This article deals with the investigation of radiation inducedcrosslinking of PB by NMR microscopy.     

1—十二烷基氮杂环庚烷—2—酮的合成

已内酰胺与溴代十二烷在氢氧化钾的作用下，于甲苯中进行Ｎ－烷基化反应，合成了１－＋二烷基氮杂环庚烷－２－酮，收率８８％－９２％。     

神经网络—紫外光度法同时测定水中硝酸盐氮和亚硝酸盐氮

研究了硝酸盐和亚硝酸盐的紫外吸收光谱。利用基于ＢＰ算法的人工神经网络对光谱数据处理,提出同时测定水样中硝酸盐氮和亚硝酸盐氮的新方法。对人工合成试样和实际水样进行了测定。结果满意。采用均匀设计法构建试验系统及网络运行参数的选择。效果良好。     

Vaporization enthalpies and vapor pressures of the major components of opopanax oil, α-santalene,cis α-bisabolene,cis α-bergamotene

Structural Chemistry - The vapor pressures and vaporization enthalpies of the major components of opopanax oil, a medicinal that has been in use since biblical times, are evaluated by correlation...     

新的cis—Pt(diphos)(Ⅹ)_2配合物的合成和谱学表征

本文合成了三个新的双膦螯合配体和一系列新的cis-Pt(diphos)X_2(diphos=R_2PCH_2CH_2PR_2,R=Et,n-Pr,n-Bu,i-Bu;X=Cl~-,Br~-,I~-,CN~-,SCN~-,NO_2~-)配合物,经过IR、~(31)PNMR和元素分析表征了它们的结构,并观察到~(31)P化学位移δp、铂-磷偶合常数J(p1-p)与配体X的反位效应和双膦配体的σ-供电性质有关。此外,根据谱学研究,发现SCN~-和NO_2~-配体存在键合异构现象,并对谱带进行了归属。     

铂配合物cis—[Pt（nh3）2（4—mepy）Cl]NO3与甲在—谷胱甘肽作…

使用质子核磁共振方法了新的抗癌活性配合物ｃｉｓ」Ｐｔ（ＮＨ３）２（４－ｍｅｐｙ）Ｃｌ「＾＋与甲基－谷胱甘应及其动力学。结果表明Ｐｔ与ＧＳ－Ｍｅ间形成１：１加合物。为了解结合部位，对Ｐｔ－ＧＳ－Ｍｅ配合物进行ｐＨ滴定，由ＧＳ－Ｍｅ的质子核磁共振谱对ｐＨ的依赖关系判断Ｇｓ－Ｍｅ只通过Ｓ原子与Ｐｔ配位，而氨基和羧基不参与配位反应。