125153-18-6Relevant articles and documents
Dissymmetric ansa zirconocene complexes with di- and trisubstituted indenyl ligands as catalysts for homogeneous ethylene homo- and ethylene/1-hexene copolymerization reactions
Rimkus, Andrea M.,Alt, Helmut G.
, p. 72 - 82 (2017/02/18)
Different routes for the synthesis of 1,2- and 1,2,3-substituted indene derivatives are described. Representative substituents are: Me, Ph, PhCH2, PhCH2CH2, PhCH2CH2CH2, CH2CH?=?CH2. Subsequent deprotonation of these substituted indenes and reaction with indenyl zirconium trichloride gave the corresponding dissymmetric bis(indenyl) zirconium complexes. After activation with methylaluminoxane (MAO) these complexes show high activities both in ethylene homopolymerisation and ethylene/1-hexene copolymerisation. The rate of comonomer incorporation can reach 33.3% (15/MAO). The copolymers exhibit lower melting points than the homopolymers and their crystallinities α are lower compared with the homopolymers.
Unbridged metallocene dichloride complexes with mono-substituted indenyl ligands and their application for the polymerization of propene
Schmidt, Roland,Alt, Helmut G.
, p. 304 - 309 (2007/10/03)
The synthesis of unbridged metallocene dichloride complexes of the type Ind′2ZrCl2 (Ind′ = 2-alkyl- or arylalkyl-substituted indenyl) is described. The complexes are characterized by 1H- and 13C-NMR spectroscopy and mass spectrometry. After activation with methylalumoxane these complexes can be used for propene polymerization; they produce block copolymers consisting of alternating isotactic and atactic blocks. The polymerization results and the polymer properties are presented. The influence of the catalyst structure on the polymerization behaviour is discussed.
AN EFFICIENT INTERMOLECULAR CARBON-CARBON BOND FORMATION VIA SmI2-PROMOTED ANION RADICAL ALKYLATION
Ujikawa, Osamu,Inanaga, Junji,Yamaguchi, Masaru
, p. 2837 - 2840 (2007/10/02)
Anion radicals generated from the corresponding ketones with the efficient one electron transfer system, SmI2-THF-HMPA, attacked a variety of activated olefins at room temperature affording the corresponding addition products in good to excellent yields,