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Half‐Metallocene Tantalum Complexes Bearing Methyl Methacrylate (MMA) and 1,4‐Diaza‐1,3‐diene Ligands as MMA Polymerization Catalysts
Author(s) -
Matsuo Yutaka,
Mashima Kazushi,
Tani Kazuhide
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20010302)40:5<960::aid-anie960>3.0.co;2-w
Subject(s) - diene , tantalum , methyl methacrylate , polymerization , catalysis , metallocene , polymer chemistry , bearing (navigation) , materials science , chemistry , organic chemistry , polymer , composite material , natural rubber , cartography , geography
Activation with AlMe 3 at low temperature converts half‐metallocene complexes of tantalum with methyl methacrylate (MMA) and diazadiene ligands such as [Cp*Ta( η 2 ‐Cy‐DAD)( η 4 ‐MMA)] (structure shown) into effective catalysts for the polymerization of MMA. Polymerization is complete after 10 min at −20°C and gives a poly(methyl methacrylate) of narrow polydispersity. Cp*= η 5 ‐C 5 H 5 , Cy‐DAD=1,4‐dicyclohexyl‐1,4‐diaza‐1,3‐butadiene.