Kulyabin, Pavel S. published the artcileMultisubstituted C2-symmetric ansa-metallocenes bearing nitrogen heterocycles: influence of substituents on catalytic properties in propylene polymerization at higher temperatures, SDS of cas: 880652-93-7, the main research area is ansa zirconocene carbazolyl preparation stereoisomer catalyst propylene polymerization; Buchwald Hartwig amination preparation carbazolyl ansa zirconocene polymerization catalyst; electrophilic amination cyclization preparation carbazolyl ansa zirconocene polymerization catalyst.
In this work we systematically studied the effects of modifications of substituents on the performance of the isospecific zirconocene-based catalyst family, Me2Si(2-Alk-4-(N-carbazolyl)Ind)ZrX2 (X = Cl, Me), wherein the progenitor was shown to be particularly suitable in high-temperature propylene polymerization processes. In order to obtain the required zirconocenes, we developed a novel synthetic pathway to 4-(N-carbazolyl)indenes through Pd-catalyzed cyclizations of 2,2′-dibromobiaryls with 4-aminoindenes, which were synthesized via Buchwald-Hartwig reaction or electrophilic amination of 4-indenyl Grignard reagents with trimethylsilylmethyl azide. By a number of examples, the anion-promoted rac-to-meso isomerization method was shown to work reliably well for preparation of rac-ZrMe2-complexes. Certain zirconocenes among the 21 tested in propylene polymerization at 70-100° under MAO or borate activation outperformed the parent catalyst in mol. weight capability, regio- or stereoselectivity.
Dalton Transactions published new progress about Aluminoxanes, Me Role: CAT (Catalyst Use), USES (Uses) (MAO). 880652-93-7 belongs to class bromides-buliding-blocks, name is 7-Bromo-2-methyl-1H-indene, and the molecular formula is C10H9Br, SDS of cas: 880652-93-7.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary