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Effect of Cocatalysts on the Catalytic Activities of Tantalum‐ and Niobium‐Based Catalysts for Ring‐Opening Metathesis Polymerization of Norbornene
Author(s) -
Nakayama Yuushou,
Tanimoto Masaya,
Shiono Takeshi
Publication year - 2007
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600712
Subject(s) - norbornene , romp , niobium , tantalum , polymerization , polymer , catalysis , metathesis , ring opening metathesis polymerisation , polymer chemistry , materials science , chemistry , organic chemistry
A series of pentavalent tantalum and niobium complexes with aryloxy ligands was prepared, and their catalytic behavior for the ROMP of norbornene was studied in the presence of an alkylaluminum cocatalyst. Tantalum complexes 1 – 4 showed very high activity for the ROMP of NBE in combination with i Bu 3 Al to give high‐molecular‐weight polymers. In contrast, the niobium complexes 5 and 6 , as well as NbCl 5 , exhibited very high activity upon activation with Me 3 Al to give high‐molecular‐weight polymers.