In this paper the ring-opening cross-metathesis of silicon substituted norbornenes with ethene is reported. Silicon containing norbornenes could be selectively ring-opened via a cross-metathesis with ethene employing Ru-based catalysts (RuCl2-(PCy3)(=CHSiMe3) (3) or RuCl2(PCy3)(2)(=CHPh) (4)). It was also found that for the ethenolysis, the order of sequence of the individual reagents is of crucial importance. Under mild reaction conditions and by premixing of ethene and the catalyst before the silicon containing norbornene (C13H24O3Si (5) or C12H24OSi2 (6)) was added, it was possible to convert 5 and 6 into the desired silicon containing alpha,omega-diooelefins quantitatively. (C) 2000 Elsevier Science S.A. All rights reserved.
全文通过钯 (II) 二茂铁异蝎酸酯络合物对降冰片烯衍生物进行可切换聚合 Mark Abubekerov、Scott M. Shepard 和 Paula L. Diaconescu* 摘要:二茂铁螯合异蝎酸酯络合物 [fc(PPh 2 )(BH[(3, 5-Me) 2 pz] 2 )]PdMe ((fc P,B )PdMe, fc = 1,1'-二茂铁,pz = 吡唑) 催化降冰片烯和降冰片烯衍生物在用 [ Ac Fc] 氧化后的加成聚合反应BAr F ] (乙酰基二茂铁四(3,5-双(三氟甲基)苯基)硼酸盐)。[(fc P,B )PdMe][BAr F ] 在取代降冰片烯存在下的原位还原导致催化活性显着降低。添加一当量的氧化剂可恢复活性。引言乙烯基聚降冰片烯由于其优异的热稳定性而成为光学应用的重要材料,高玻璃化转变温度、小双折射和介电损耗。1- 然而,聚降冰片烯很脆,即使在高分子量
Synthesis of Novel Palladium Complexes Containing β‐Diketonate and NHC Ligands and their Catalytic Ability for Addition Polymerizations of the Functional Norbornenes
作者:Dong Jin Lee、Myungwoong Kim、Chan Kyung Kim、Ik Mo Lee
DOI:10.1002/bkcs.11761
日期:2019.7
containing various N‐heterocycliccarbene (NHC) ligands have been successfully synthesized by the reaction with various β‐diketonate complexes. Treatments of Pd(acac)2 with NHC salts such as 1,3‐di(2,6‐diisopropylphenyl)imidazolium chloride (IPr·HCl) or 1,3‐di(mesityl)imidazolium chloride (IMes·HCl) resulted in [Pd(acac)(NHC)Cl] complexes and these complexes were characterized by NMR. Moreover, these
Novel Pd Catalysts with β-Diketiminates for Homopolymerization of Functionalized Norbornene Derivatives in Water/Organic Mixed Solvents
作者:Eung Jun Lee、Wook Kyoung Won、Byoungki Lee、Youn Hee Kye、Ik Mo Lee
DOI:10.5012/bkcs.2013.34.9.2720
日期:2013.9.20
Polynorbornenes prepared by vinyl addition pathway are known to have some desirable characteristics for wider application but they have some critical drawbacks such as brittleness, poor solubility and adhesion. In order to improve these drawbacks, extensive research for the successful homo- and copolymerization of polar functionalized norbornene with olefin has been carried out. Even though considerable advance has been achieved in the polymerization of polar functionalized monomers, successful catalytic systems for the homopolymerization of polar functionalized norbornene are rare. In this study, a novel successful catalytic system for the polymerization of polar functionalized norborene is proposed. This system employs Pd $\beta}$-diketiminate/borate cocatalyst in water/organic mixed solvents and it is unique due to introduction of water as a component of solvents. Polymers obtained in this study show high Mw with narrow PDI. Effects of several reaction parameters to the polymer activity and properties are investigated and optimal catalytic system are proposed.