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Volumn 13, Issue 3, 2007, Pages 923-935

Chiral fluorous dialkoxy-diamino zirconium complexes: Synthesis and use in stereospecific polymerization of 1-hexene

Author keywords

Dioxygen ligands; Fluorinated ligands; Polymerization; Tacticity; Zirconium

Indexed keywords

AMINES; MOLECULAR WEIGHT; OLEFINS; POLYMERIZATION; SYNTHESIS (CHEMICAL); X RAY DIFFRACTION ANALYSIS;

EID: 33846409852     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200600895     Document Type: Article
Times cited : (42)

References (82)
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    • 2- dialkoxide ligands, see: a) L. Lavanant, L. Toupet, C.W. Lehmann, J.-F. Carpentier, Organometallics 2005, 24, 5620-5633;
    • 2- dialkoxide ligands, see: a) L. Lavanant, L. Toupet, C.W. Lehmann, J.-F. Carpentier, Organometallics 2005, 24, 5620-5633;
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    • For other Group 3 and 4 and lanthanide complexes bearing fluorinated alkoxide ligands, see: a D. C. Bradley, H. Chudszynska, M. B. Hursthouse, M. Motevalli, Polyhedron 1994, 13, 1907-1918;
    • For other Group 3 and 4 and lanthanide complexes bearing fluorinated alkoxide ligands, see: a) D. C. Bradley, H. Chudszynska, M. B. Hursthouse, M. Motevalli, Polyhedron 1994, 13, 1907-1918;
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    • The synthetic procedure is identical to that of related fluoro amino alcohol ligands HO(CF3)2CH2NH(CH 2CH2OMe) and HO(CF3)2CH 2N(CH2CH2OMe)2, which have been utilized in preparation of the SrII, BaII, and Cu II CVD source reagents: a) Y. Chi, S. Ranjan, T.-Y. Chou, C.-S. Liu, S.-M. Peng, G.-H. Lee, J. Chem. Soc. Dalton Trans. 2001, 2462-2466;
    • II CVD source reagents: a) Y. Chi, S. Ranjan, T.-Y. Chou, C.-S. Liu, S.-M. Peng, G.-H. Lee, J. Chem. Soc. Dalton Trans. 2001, 2462-2466;
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    • 2 by alcohol nucleophiles see also: d) V. A. Petrov, Synthesis 2002, 2225-2231.
    • 2 by alcohol nucleophiles see also: d) V. A. Petrov, Synthesis 2002, 2225-2231.
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    • The lower limit for the racemization barrier ΔG (racemization) was estimated by using the following equations: ΔG(racemization, 4.576Tc[10.319+log(T c/kc, where Tc is the (estimated) coalescence temperature and kc is the exchange rate constant at coalescence, which is given by kc, π[(ΔvAB2, 6JAB2]1/2/21/2. For C(CF 3)2CH2: ΔvAB, 162 Hz, J AB, 10.3Hz, TC, 403 K. See: b) S. Alexander, J. Chem. Phys. 1962, 37, 967-974;
    • C = 403 K. See: b) S. Alexander, J. Chem. Phys. 1962, 37, 967-974;
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    • 19F NMR quartets was observed upon warming, but the diasteromeric ratio changed to about 1:2 at 338 K. The phenomenon is reversible upon cooling.
    • 19F NMR quartets was observed upon warming, but the diasteromeric ratio changed to about 1:2 at 338 K. The phenomenon is reversible upon cooling.
  • 64
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    • Complex 5 is stable overnight at 220 K and decomposes within 6 h at 270 K, and more rapidly at room temperature.
    • Complex 5 is stable overnight at 220 K and decomposes within 6 h at 270 K, and more rapidly at room temperature.
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    • A similar DFT study was also performed on the neutral complexes H and 3, and gave results consistent with spectroscopic observations.
    • A similar DFT study was also performed on the neutral complexes H and 3, and gave results consistent with spectroscopic observations.
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    • Catalytic combinations based on MAO activator were not explored because of the possible transfer of (OZZOR)2- ligands between group 4 metal and aluminum centers; see reference [10b
    • 2- ligands between group 4 metal and aluminum centers; see reference [10b].
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    • At 45 °C and 8 atm, Zr(CH2Ph)2({pyC(CF 3)2O}2, G) combined with [Ph 3C][B(C6F5)4] affords 56 kg PE mol-1 h-1, Mw, 21 800 g mol-1 and Mw/Mn, 3.7; with B(C6F5) 3, 32 kg PE mol-1 h-1, Mw, 16100 gmol-1 and Mw/Mn=2.6. See reference [11
    • n=2.6. See reference [11].
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.