Dicyclopentadienyl complexes of titanium,niobium, and tungsten in the controlled synthesis of poly(methyl methacrylate)

Organometallic compounds Cp₂TiCl₂, (EtC₅H₄)₂NbCl₂, and (PrⁱC₅H₄)₂WCl₂ were assessed as additives that control polymer chain growth in the polymerization of methyl methacrylate. In the presence of compounds mentioned in amounts comparable with that of the initiator, a uniform process with no gel-effect occured and respective linear increase in the molecular weight of the polymer up to high degrees of the monomer conversion was observed.     

Interaction of dicyclopentadienyl chloride complexes of yttrium and lutetium with sodium naphthalenide

The reaction of Cp₂LuCl with sodium naphthalenide gives an anionic hydride complex [(Cp₂LuH)₃H][Na(THF)₆] (1) and complex Cp₂Lu(2-C₁₀H₇)(THF) (2) containing a -bonded naphthyl ligand. The structure of1 was confirmed by X-ray analysis. When Cp₂YCl is used as the starting material, Cp₃Y and an anionic hydride complex also containing a -naphthyl ligand are formed. A reaction mechanism involving the formation of an unstable complex [(Cp₂Ln⁺)₂(C₁₀H² ₈-)] (4) and its fragmentation into hydride and -naphthyl species is proposed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 20–20, November, 1994.     

二茂镁的原位合成及其与羰基化合物的反应

研究了通过萘锂还原法制得的活性镁与环戊二烯原位合成环戊二烯基镁(Cp~2Mg)的方法。Cp~2Mg的存在是由它与醛酮反应生成富烯得到证实。此法产率高, 方法简单, 条件温和。     

环氧氯丙烷橡胶的热可逆共价交联

以环戊二烯二羧酸钾 [DCPD(COOK) 2 ]为交联剂 ,采用溶液反应法使环氧氯丙烷橡胶 (环氧氯丙烷均聚物 ,CER)交联 ,制得了凝胶含量达 88 75 %的交联CER ,研究了溶剂种类、反应温度、催化剂及交联剂用量对凝胶形成量的影响 .IR谱证明 ,DCPD(COOK) 2 与CER发生双端酯化而交联 ;反应溶解性试验表明 ,该共价交联聚合物具有热可逆转化特性 ,热可逆转化百分率随反应温度的提高、交联剂用量的增多而下降     

THE ESR STUDY OF SOME DICYCLOPENTA-DIENYL TITANIUM HALIDE COMPLEXES

The ESR spectra of some [Cp_2Ti(L)X] complexes (Cp: C_5H_5, MeC_5H_4; L: phosphane,isocyanide, pyridine, amine and carbon monoxide; X: F, Cl, Br, I) have been obtained.When X is Cl, Br or I, the linear relationships between the g value and hyperfine couplingcoustant a(Ti) are explained in terms of the electron character of the L ligand and the ESRspectral trends of the complexes are studied.     

水相法合成双(环戊二烯基)钛氨基酸配合物的研究

以N-(取代苯基)氨基乙酸及盐与双(环戊二烯基)二氯化钛在水相及有机相反应,得到了五个双(环戊二烯基)钛氨基酸配合物,对配合物进行了熔点、元素分析、IR及^1HNMR的表征,确定了它们的结构。这些配合物在空气中稳定。经比较,水相中的合成反应速度快,操作简便,产物较易分离,产率高。     

二茂铁-磷钼酸电荷转移配合物修饰电极的制备及电化学性能的研究

采用电化学方法在异电基体玻碳（GC）电极上制备了二茂铁 （Fc）－磷钼酸（PMo12）电荷转移配合 物修饰电极（Fe5PMo12/GC)。研究了该电极的电化学行为,发现其在硫酸溶液中进行伏安扫描时具有良好的稳定性,而且对酸性水溶液中的过氧化氢具有较好的电催化学原作用, 初步探讨了电催化还原机理。