[P^O]配体钯催化剂催化乙烯与丙烯酸甲酯聚合及其共聚合反应

合成了2个[P^O]配体2-(二苯基膦)-苯磺酸(简称L1)和2-[二(5-甲基-苯基)膦]-苯磺酸(简称L2),并用1 H-NMR、31 P-NMR、MS和IR对配体进行表征.分别采用L1、L2与Pd(OAc),原位形成的催化体系对乙烯、丙烯酸甲酯进行催化聚合与共聚反应,发现这类催化体系可以在无任何助催化剂的作用下引发聚合反应.以L1/Pd(OAc)2为催化体系研究了不同反应条件对乙烯与丙烯酸甲酯聚合的影响.对于乙烯单体,当n(L1)∶n(Pd(OAc)2)=1∶1时催化活性较n(L1):n(Pd(OAc)2)=2∶1时高;对于丙烯酸甲酯单体,当n(L1)∶n(Pd(OAc)2)=2∶1时催化活性较n(L1)∶n(Pd(OAc)2)＝1∶1时高;若两者共聚,则当n(L1)∶n(Pd(OAc)2)=1∶1时催化活性更佳.L2/Pd(OAc)2催化体系的活性比L1/Pd(OAc)2催化体系的活性高.     

含有大的吸电子取代基化合物GeR_2Cl_2(R=Ar,Ar′和Ar″)的合成、晶体结构与~(19)F NMR

GeCl4与ArLi和Ar′Li(Ar″Li与Ar′Li 1∶1的混合物)反应生成化合物GeAr2Cl2,GeArCl3和GeAr″2Cl2,测定了GeAr2Cl2和GeAr″2Cl2的晶体结构,并进行了19F NMR表征.     

Palladium(Ⅱ) and Platinum(Ⅱ) Compounds Derived From Potentially Terdentate Ligands

1Introduction Transition metalcomplexes derived from potentially terdentate ligands have attracted great interest in the late years. Among all the examples described so far, those containing palladium(Ⅱ) or platinum(Ⅱ) and ligands holding three heteroatoms with different donor abilities are particularly relevant. In compounds of this kind, the potential hemilability[1] of one of the terminal σ(M-donor atom) bonds, plays an important role in the view of their applications in homogeneous catalysis[2]. On the other hand, it is well-known that in dimetallic complexes the presence of two different metals in a close vicinity may influence their mutual cooperation in a wide variety of processes[3]. Besides that, some examples of the utility of chiral palladium( Ⅱ ) as well as platinum( Ⅱ ) complexes as precursors for organic and/or organometallic synthesis, as chiral recognitors or discriminators, or even in Bio-Medicine have also been reported[4- 6]. However, chiral heterodimetallic compounds holding ferrocenyl units and potentially terdentate ligands are scarce.     

An empirical technique to evaluate the UV irradiation time for highly polluted waters prior to ASV detection

Conducting anodic stripping voltammetry (ASV) to determine non-labile-form metal in a water sample usually requires UV digestion. The time for thoroughly disintegrating metal complexes is lengthy and completion of digestion is not easy to determine. In this study, the degree of dissociation of copper complex, indicated by the ratio of slope changes at ASV titration, was found to be linearly correlated with UV irradiation time (r 2 = 0.976). Using slope changes, an equation for estimating the length of UV ir...     

2-(5-氨甲基-2-羟基苯基)苯并咪唑的合成及荧光性质研究

以水杨醛为初始原料,通过羟甲基化、与邻苯二胺成环、氯甲基化、Gabriel反应制备了2-(5-氨甲基-2-羟基苯基)苯并咪唑,用核磁、红外对中间产物及目标产物进行了结构表征,并研究了各中间产物及目标产物的荧光性质,结果表明目标产物具有较高的荧光量子收率和较大的斯托克斯位移.     

水溶性氮杂环卡宾金属化合物的催化应用

 水溶性氮杂环卡宾金属化合物因催化效率高、选择性和稳定性较好及应用范围广,成为有机合成中重要的催化剂,在选择性催化有机反应中发挥着重要作用。本文综述近年来水溶性氮杂环卡宾金属配合物的主要类型、合成方法及其在金属有机催化反应中的研究进展。     

Opioids and behavior: genetic aspects

Summary Three animal models, based on genetic differences in endogenous opioid peptides and opioid receptors, are described. Obese mice and rats, whose pituitary opioid content is elevated, may be used to investigate eating disorders. Recombinant inbred strains of mice, which differ in brain opioid receptors and analgesic responsiveness, can be used for study of opioid-and nonopioid-mediated mechanisms of pain inhibition. Individual reactivity to opioids can be examined in C57BL/6 and DBA/2 inbred strains of mice. A model that combines a variety of opioid effects is offered and suggests the existence of a genetically determined dissociation of opioid effects on locomotor activity and pain inhibition. In addition, stimulatory locomotor responses in the C57BL/6 reaction type are linked to a high risk of drug addiction and facilitatory effects on adaptive processes, while high analgesic potency in the DBA/2 reaction type is accompanied by a low proneness to drug abuse and amnesic properties of opioids.     

丙硫咪唑制备过程中联产醋酸乙酯试验

对驱虫药物丙硫咪唑生产过程中副产物利用问题进行了试验，对降低生产成本有一定意义。     

苯骈15-冠-5催化二溴卡宾与苯乙烯和多芳代苯乙烯环加成反应动力学

本文研究了在50％NaOH,CH_2Cl_2体系中,苯骈15-冠-5催化产生的二溴卡宾与苯乙烯、多芳代苯乙烯反应的相对速率常数K_(rel),讨论了苯乙烯α及β位上芳基取代基数目和空间位置对K_(rel)的影响。     

微波催化快速合成苯并咪唑及其2-烷基衍生物

在无催化剂、无溶剂条件下,由邻苯二胺与有机酸经微波催化熔融反应,快速合成苯并咪唑及几种2-烷基衍生物．装置简单,操作容易,反应快速并且排污少．产品经红外光谱验证．