Efficient Synthesis of the Oxadiazole Biphenyl Tetrazoles

Since the discovery of losartan[1](DUP 753), the leading non-peptide AT1 antagonist, several highly potent AT1 selective antagonists bearing heterocycles have been reported. [2] The tetrazole group is a common acidic functionpresent in many these antagonists.     

变量有广义界线性规划的直接对偶单纯形法

本文讨论变量有广义界线性规划问题借助标准形线性规划同单纯形法技术，建立问题的一个直接对偶单纯形法。分析了方法的性质，给出了初始对偶可行基的计算方法，并用实例说明方法的具体操作。     

用可溶性催化剂合成顺式聚丁二烯的研究——Ⅰ.用CoCl2·4C5H5N-(C2H5)2AlCl作催化剂

本文研究了催化剂的用量、单体的浓度、聚合温度等聚合条件对聚丁二烯的转化率、分子量以及链结构的影响。试验结果表明:这个催化剂的特点是催化剂用量极少,1,4-顺式含量高而且稳定,聚合速度太快,高聚物的分子量过大,因此进一步研究了聚合速度的控制和高聚物分子量的调节。已得到的结果是:(1)在不同溶剂中聚合的速度相差甚大。其快慢的顺序是,苯>甲苯>二甲苯>三甲苯。(2)添加一些如苯基-β-萘胺、N,N′-二苯基对苯二胺等胺类,既可减慢聚合速度,又能降低高聚物的分子量。(3)调节体系中水分的含量,控制高聚物的分子量。(4)利用二种溶剂混合的不同比例,调节高聚物的分子量。(5)加入少量的萘、蒽等稠环芳烃于庚烷溶剂中,则大大提高高聚物的分子量。对上述结果进行了讨论。     

氧化偶联聚合方法合成电活性聚芳醚酮

通过氧化偶联聚合方法成功地合成出电活性聚芳醚酮. 该反应条件温和, 操作简单, 室温下即可进行. 用红外光谱、核磁共振谱、高效凝胶渗透色谱、循环伏安、热失重、X射线衍射等技术对所合成的聚合物进行了表征, 并探讨了聚合物的性能.     

高效液相色谱-串联质谱法测定鸡组织中的喹烯酮标示残留物

采用液相色谱-串联质谱（HPLC—MS／MS）法测定鸡组织（肌肉、肝、肾）中喹烯酮标示残留物3-甲基喹噁啉-2-羧酸的含量。组织匀浆样品经碱水解、液液萃取，采用HPLC—MS／MS电喷雾电离（ESI），正离子模式，多反应监测（MRM），以喹噁啉-2-羧酸为内标进行定量。检出限为5μg／kg。     

DNA为模板的铂纳米团簇沉积

Platinum nanoclusters were deposited along the supercoiled DNA strands after incubation of cis-(trans-1R，2R-diaminocyclohexane)(dl-camphorato)platinum(Ⅱ) (Cdp)， an analogue of the anti-tumor drug-carboplatin， with DNA and K₂PtCl₄ for 600 min and then through reduction of dimethylaminoborane (DMAB). The decrease of absorption of DNA at 260 nm indicates the coordination of Cdp and DNA. TEM and AFM were employed to characterize the morphologies and structures of platinum nanoclusters.     

~1H MAS NMR characterization of hydrogen over silica-supported rhodium catalyst

Hydrogen species in both SiO2 and Rh/SiO2 catalysts pretreated in different atmospheres (H2, O2, helium or air) at different temperatures (773 or 973 K) were investigated by means of 1H MAS NMR. In SiO2 and O2-pretreated catalysts, a series of downfield signals at -7.0, 3.8-4.0, 2.0 and 1.5-1.0 were detected. The first two signals can be attributed to strongly adsorbed and physisorbed water and the others to terminal silanol (SiOH) and SiOH under the screening of oxygen vacancies in SiO2 lattice, respectively. Besides the above signals, both upfield signal at -110 and downfield signals at 3.0 and 0.0 were also detected in H2-pretreated catalyst, respectively. The upfield signal at -110 originated from the dissociative adsorption of H2 over rhodium and was found to consist of both the contributions of reversible and irreversible hydrogen. There also probably existed another dissociatively adsorbed hydrogen over rhodium, which was known to be p hydrogen and in a unique form of "delocalized hydrogen". It wa     

Extraction and Crystal Structure of Karounidiol

1 INTRODUCTION Karounidiol is a natural pentacyclic triterpene compound, which was identified as a novel compound initially from the Japanese commercial seeds of Trichosanthes kirilowii Maxim. (Fam. Cucurbitaceae)[1], and then isolated from the Chinese commercial seeds of T. kirilowii Maxim. and T. rosthornii Harms[2, 3] and the Japanese wild plant seeds of T. cucumeroides (Ser.) Maxim.[4]. It has not been isolated from other plants up to now, so we are thinking about how to use th…     

环化聚合的研究——聚合温度对甲基丙烯酸酐聚合反应机构的影响

前报关于对称非共轭双烯的环化聚合反应机构我们提出了单分子与双分子结合考虑的反应机构,由此而推得环化聚合组分方程为 -(d[M]/d[m])=A+(B/[M])A,B为反应速度常数的函数,本文报导甲基丙烯酸酐(MAN)在不同温度下进行环化聚合的研究进一步验证上述方程。当分别在60,40及25°聚合时,以d[M]/d[m]对1/[M]作图,都得到了直线,它们的截距分别为2.90,2.15及1.70。若只考虑单分子环化机构则截距将总是1,而不可能随聚合温度不同而改变,因此证实了前文所提出的方程及机构。本文并求得了在60,40及25°聚合时的双分子反应与单分子反应速度(双/单)的比值分别大于 2.7[M],2.0[M]及 1.4[M]。随聚合温度下降,双/单比值也下降,故当温度更低及在较稀单体浓度下聚合时,才有可能主要按单分子环化机构进行。本文还求得双分子环化反应活化能(E_(1c))较单分子环化反应活化能(E_c)高约3.7千卡/克分子,因而对为什么聚合温度升高时聚合体环化率也将升高作出解释。     

Synthesis of a Novel Core-shell Type Acrylic-polyurethane Hybrid Emulsion Containing Siloxane and Fluorine as well as Water and the Oil Resistances of Cured Film

Aqueous acrylic-polyurethane dispersions have become one of the major types of materials used in coating, paint and adhesive industries, because of excellent properties and environmental advantages1-5. However, some properties for cured film such as water…