Syndiospezifische polymerisation von propylen: 3-, 4-, 3,4-und 4,5-substituierte zirkonocenkomplexe des typs (C13H8-nRnCR′2C5H4)ZrCl2 (n = 1, 2; R = alkyl, aryl; R′ = Me, Ph)

Article abstract of DOI:10.1016/0022-328X(95)06048-2

Substituents in the positions 3, 4, 5 and 6 of the fluorenylidene fragment clearly influence the polymerization behaviour of the syndiospecific catalyst systems (C₁₃H_8-nR_nCR′₂C₅H₄)ZrCl₂/MAO (n = 1, 2; R = alkyl, aryl; R′ = Me, Ph). We report seven new catalyst precursors of this type, including first polymerization results. An X-ray study of the 4,5-dimethyl derivative 10b explains the reduced activity and stereospecifity of this catalyst.