Dinuclear metallocene complexes as catalyst precursors for homogeneous ethylene polymerization

N-(2-Hydroxyethyl)-2-[3-(p-tolyl)triazen-1-yl]benzamide

“…For the synthesis of new ligands to stabilize dinuclear complexes and control their reactivity, see: Das et al (2008); Estevan et al (2006); Jie et al (2007); Mü ller & Vogt (2007); Schilling et al (2008). For the synthesis of 1,3-bis(aryl)triazenes as precursors for triazenido ligands bearing Lewis basic ortho substituents such as ester, methoxy and methylmercapto groups, see: Nuricumbo-Escobar et al(2007); Ríos-Moreno et al (2003); Rodríguez et al (1999); Tejel et al (2004).…”

“…The synthesis of alternative ligands to stabilize dinuclear complexes and control their reactivity is an area of great importance in coordination and organometallic chemistry (for recent literature see: Das et al, 2008;Estevan et al, 2006;Jie et al, 2007;Müller & Vogt, 2007;Schilling et al, 2008). In this context, we have focused our attention to the synthesis of 1,3-bis(aryl)triazenes as precursors for triazenido ligands bearing Lewis basic ortho substituents such as ester, methoxy and methylmercapto groups (Nuricumbo-Escobar et al, 2007;Ríos-Moreno et al, 2003;Rodríguez et al, 1999;Tejel et al, 2004); it has been found that the nature of the substituent produces a dramatic impact on their coordination chemistry and reactivity.…”

Mononuclear complexes with heterocyclic ligands as ethylene polymerization catalysts for single-reactor bimodal polyethylene technology

“…This can be disadvantageous when processing polyolefins, and solutions are needed to overcome this problem. So far, special support materials and methods, the mixture of different catalysts, the application of dinuclear or multinuclear catalysts and the use of two or more reactors were applied [4][5][6][7][8][9][10][11][12][13]. However, the best solution is the design of catalysts that can solve all these problems in one step and in one reactor.…”

Surface Coordination Polymerization of Ethylene by Hydrozirconation‐Immobilized Metallocene

“…With these vinyl‐substrates, we believe that a well‐known Schwartz hydrozirconation will probably provide a novel method for immobilization of zirconocene (Scheme ). The resultant hydrozirconated surface with a ZrC σ‐bond linkage between the substrate and zirconium atom could be stable and serve as initiators for ethylene poly­merization after cationization by MAO . This work demonstrated the first example for olefin‐surface‐initiated polymerization by metallocene immobilized via hydrozirconation, which provides a new method to prepare polyolefin hybrid material by in situ polymerization.…”