期刊
MACROMOLECULAR CHEMISTRY AND PHYSICS
卷 214, 期 4, 页码 492-498出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201200509
关键词
copolymerization; organometallic catalysts; ring-opening metathesis polymerization; transition metal chemistry
资金
- National Natural Science Foundation of China [21174068]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20110031110009]
- Fundamental Research Funds for the Central Universities
A series of o-aryloxide-N-heterocyclic carbene ruthenium complexes 24 is synthesized via sequential reactions of the o-hydroxyaryl imidazolium proligands (2-OH-3,5-tBu2C6H2)(R)(C3H3N2)+Br (R = Me (1a), iPr (1b), Mes (1c)) with Ag2O and [(C6H6)RuCl2]2. All of the complexes are characterized by 1H and 13C NMR spectroscopy, high-resolution mass spectrometry (HRMS), and elemental analysis. The molecular structure of 2 is determined by single-crystal X-ray diffraction analysis. The ring-opening metathesis polymerization (ROMP) of norbornene (NBE) with 24 is studied. Among them, complex 4 exhibits the highest activity and efficiency toward ROMP of NBE at 85 degrees C without any cocatalyst, and the resultant polymers have very high molecular weight (>106 Da) and narrow molecular weight distributions. This complex can also efficiently catalyze the alternating copolymerization of NBE and cyclooctene.
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