ИСТИНА

The metallocene is represented by a formula I, wherein M is a group 3, 4, 5 or 6 transition metal, or a lanthanide metal, or actinide metal; E is: (1) a indenyl deriv. that is bonded to Y through the 4, 5, 6, or 7 position of the indenyl ring, or (2) a heteroindenyl deriv. that is bonded to Y through the 4, 5, or 6 position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom, or (3) a fluorenyl deriv. that is bonded to Y through the 1, 2, 3, 4, 5, 6, 7, or 8 position of the fluorenyl ring, or (4) a heterofluorenyl deriv. that is bonded to Y through the 1, 2, 3, 4, 5, or 6 position of the heteroindenyl ring, provided that the bonding position is not the same as the position of the ring heteroatom; A is a cyclopentadienyl deriv., a heterocyclopentadienyl deriv., a indenyl deriv., a heteroindenyl deriv., a fluorenyl deriv., a heterofluorenyl deriv., or other mono-​anionic ligand; Y is a Group 15 or 16 bridging heteroatom substituent that is bonded via the heteroatom to E and A; and X are, independently, univalent anionic ligands. Thus, 4-​bromo-​1-​methoxy-​2-​methylindane in 400 mL THF was added with 70.7 mL 2.5 M butyllithium at -​78°, added with 9.54 g of SCl2 in 40 mL hexane at -​78°, slowly warmed to room temp. to give 1-​methoxy-​4-​[(1-​methoxy-​2-​methyl-​2,​3-​dihydro-​1H-​inden-​4-​yl)​sulfanyl]​2-​methylindane, which was demoxylated in a mixt. of 200 mL 16 M HCl and 200 ML of methanol for 8 h at reflux to give 12.8 g bis(2-​methyl-​1H-​inden-​7-​yl)​sulfide after the workup. Bis(2-​methyl-​1H-​inden-​7-​yl)​sulfide (8.0 g) was reacted with 24.0 mL 2.5 M butyllithium in toluene, added with 35 mL ether and 15.7 g triethyltin chloride, added with 6.74 g ZrCl4, refluxed for 10 h to give 8.32 g 4,​4'-​sulfandiyl-​bis(η5-​2-​methylindenyl)​zirconium dichloride, which was combined with MAO to polymerize ethylene with activity 27,​072 g​/(mmol·h·atm)​.