Premium
Vinylic polymerization of bicyclo[2.2.1]hept‐2‐ene by Co(II)‐catalysis
Author(s) -
Alt Frank P.,
Heitz Walter
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980901)199:9<1951::aid-macp1951>3.0.co;2-m
Subject(s) - chlorobenzene , norbornene , chemistry , methylaluminoxane , polymer chemistry , bicyclic molecule , ene reaction , polymerization , cobalt , catalysis , metallocene , medicinal chemistry , polymer , organic chemistry
The vinylic polymerization of bicyclo[2.2.1]hept‐2‐ene (norbornene) with Co(II) compounds, such as Co(II) stearate, substituted bis(1,3‐diketo)cobalt(II), Co(dppe)Cl 2 , and the metallocene [η 5 ‐(C 5 Me 5 )Co‐η 2 ‐Cl] 2 , in chlorobenzene activated with methylaluminoxane (MAO) is reported. MAO * synthesized by the hydrolysis of trimethylaluminium in chlorobenzene instead of toluene increases the catalytical activity strongly, and a turn over of 2.7 tons of poly(2,3‐bicyclo[2.2.1]hept‐2‐ene) per mol cobalt per hour was achieved. The polymers obtained are amorphous (WAXS). They show weight‐average molecular weights up to M̄ w = 1.5 · 10 6 and are soluble in chlorobenzene, 1,2‐dichlorobenzene, cyclohexane, and decahydronaphthalene.