Ruthenium Ring‐Opening Metathesis Polymerization Catalysts Bearing o‐ Aryloxide‐N‐Heterocyclic Carbenes |
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| Authors: | Yong Kong Yungang Tang Zunzhi Wang Shansheng Xu Haibin Song Baiquan Wang |
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| Affiliation: | 1. State Key Laboratory of Elemento‐Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China;2. Department of Chemistry, College of Science, Tianjin University, Tianjin 300072, People's Republic of China;3. State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People's Republic of China |
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| Abstract: | ![]()
A series of o‐aryloxide‐N‐heterocyclic carbene ruthenium complexes 2–4 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 2 – 4 is studied. Among them, complex 4 exhibits the highest activity and efficiency toward ROMP of NBE at 85 °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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| Keywords: | copolymerization organometallic catalysts ring‐opening metathesis polymerization transition metal chemistry |
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