Cu2O nanoparticles supported on hydrogentrititanatenanotubes (Cu2O/HTNT) catalysts have been efficiently catalyzed the multicomponent synthesis of 1,2,3‐triazoles in water at room temperature from different azide precursors, for example organic halides, sulfonates and anilines. The catalysts were synthesized by hydrothermal & wet‐impregnation methods and was characterized by HR‐TEM, EDS, XRD, XPS
负载在三钛酸氢纳米管(Cu 2 O / HTNT)催化剂上的Cu 2 O纳米粒子已在室温下有效地催化了水中的1,2,3-三唑由不同的叠氮化物前体例如有机卤化物,磺酸盐和苯胺进行多组分合成。该催化剂是通过水热湿法浸渍法合成的,并通过HR-TEM,EDS,XRD,XPS,N 2吸附脱附和ICP-MS进行了表征。该催化剂可通过离心回收并重复使用多达七个循环。通过单晶X射线衍射研究证明了1-苄基-4-(4-氯苯基)-1H-1,2,3-三唑(25)的结构。
Copper nanoparticles supported on silica coated maghemite as versatile, magnetically recoverable and reusable catalyst for alkyne coupling and cycloaddition reactions
presented. The catalyst has been prepared under mild conditions by fast reduction of anhydrous CuCl2 with lithium sand and a catalytic amount of DTBB (4,4’-di-tert-butylbiphenyl) as electron carrier, in the presence of the magnetic support. The catalyst has been fully characterized and its performance in different coupling and cycloaddition reactions of terminalalkynes has been studied. This new copper-based
Introducing Polar Monomers into Polyisobutylene by Living Cationic Polymerization: Structural and Kinetic Effects
作者:Katharina Hackethal、Diana Döhler、Susanne Tanner、Wolfgang H. Binder
DOI:10.1021/ma9025114
日期:2010.2.23
with styrene monomers 1a, 1b, and 2c proceeded under incorporation of the comonomer into the PIB polymer (as proven by MALDI and NMR spectroscopy), whereas monomer 1c was not incorporated and resulted in broad polydispersities of the resulting PIB polymers. Inline-IR kinetic measurements of the monomerconsumption demonstrated strong effects of the monomer structure on the polymerization kinetics, with
我们报道了使用活性阳离子聚合和TiCl 4 / TMPCl作为引发剂的极性苯乙烯单体与异丁烯(IB)的直接共聚,这首次打开了将极性部分以直接共聚的方式引入PIB聚合物的可能性。研究的极性苯乙烯单体包含吡啶(1a),可力丁(1b,1c),胸腺嘧啶(2c)和/或三唑部分(2a - 2c)。与苯乙烯单体1a,1b和2c共聚在将共聚单体结合到PIB聚合物中的过程中(如通过MALDI和NMR光谱法所证实的),而单体1c没有被结合并导致所得PIB聚合物的宽多分散性。单体消耗的在线IR动力学测量结果表明,单体结构对聚合动力学具有强烈影响,聚合速率(k p)增至15。附着的残基R(R =己基(3a),苯基(3b),对甲氧基苯基(3c),对甲基苯基(3d),对氯苯基(3e)),聚合速率降低(k p)的顺序为3e > 3b > 3c > 3e > 3a = k p(IB)。在相同条件下,相对于IB的均聚,k p