148180-35-2Relevant academic research and scientific papers
Asymmetric alkene cycloalumination by AlEt3, catalyzed with neomenthylindenyl zirconium η5-complexes
Parfenova, Lyudmila V.,Kovyazin, Pavel V.,Tyumkina, Tatyana V.,Berestova, Tatyana V.,Khalilov, Leonard M.,Dzhemilev, Usein M.
, p. 19 - 25 (2013/02/21)
The paper is devoted to a study of the reaction of terminal alkene cycloalumination by AlEt3 catalyzed with neomenthylindenyl zirconium complexes (p-S)(p-S)-bis[η5-[1-[(1S,2S,5R)-2-isopropyl-5- methylcycloh-exyl]indenyl]]zirconium dichloride (1) or (p-S)-(η5- cyclopentadienyl)[η5-[1-[(1S,2S,5R)-2-isopropyl-5- methylcyclohexyl]indenyl]]zirconium dichloride (2). It was shown that alkene and catalyst structures, as well as solvent, affect the overall yield and enantiomeric excess of the reaction product - 3-alkylsubstituted aluminacyclopentanes. The reaction of terminal alkenes with AlEt3, catalyzed by complex 1, in hydrocarbon solvents gives predominantly S-enantiomers of cyclic organoaluminum compounds with enantiomeric excess up to 37%. Complex 2 shows smaller stereoinduction effect and provides R-enantiomers of aluminacyclopentanes with 6-26%ee. The effectiveness of selenium-containing derivatizing reagent (R)-2-phenylselenopropanoic acid for the enantiomeric excess estimation in β-alkyl-1,4-butanediols obtained from cyclic organoaluminum compounds was shown.
The role of torsional isomers of planarly chiral nonbridged bis(indenyl)metal type complexes in stereoselective propene polymerization
Erker, Gerhard,Aulbach, Michael,Knickmeier, Markus,Wingbermühle, Doris,Krüger, Carl,Nolte, Matthias,Werner, Stefan
, p. 4590 - 4601 (2007/10/02)
Reaction of enantiomerically pure (l-neomenthylindenyl)lithium with ZrCl4(THF)2 gave the three diastereomeric bis(1-neomenthylindenyl)zirconium dichloride complexes 4a-A, -B, and -C, in a 93:2:5 ratio. Similarly, a 82:7:11 mixture of
