Polymerization of norbornene with a pendent sulfonyl fluoride group catalyzed by palladium complex bearing ^tBu₃P ligand

Abstract

The combination of palladium complex (tBu3P)Pd(Me)Cl (1) and NaB[3,5‐(CF3)2C6H3]4 (NaBAr4) catalyzed homopolymerization of a novel monomer, norbornene (NB) with a pendent 2‐fluorosulfonyltetrafluoroethoxymethyl chain (NBSF). Catalytic activities of 1/NaBAr4 were higher than those of previously reported palladium or nickel catalysts, probably, because the palladium center with electron donative tBu3P ligand was barely poisoned by the sulfonyl fluoride coordination. Thus, 1/NaBAr4 is the current best catalyst system for NBSF polymerization. The catalyst system also gave copolymers of NB with NBSF. The obtained copolymers have high sulfonyl‐fluoride incorporation and a narrow molecular weight distribution. Present catalyst system could control incorporation ratio of NBSF by changing a feed monomer ratio with slow addition of NB solution. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 5133–5141, 2008

Crosslinked electrolytes based on poly(butoxymethylenenorbornene) for proton exchange membrane

“…From the above equation, x could be calculated as 10By/(A‐5B), and the NBMOH content is calculated to be about 6.85% 23. It is indicated that there is about 6.85% of NBMOH in the copolymers.…”

Highly symmetric single nickel catalysts bearing bulky bis(α-diimine) ligand: Synthesis, characterization, and electron-effects on copolymerization of norbornene with 1-alkene at elevated temperarure

“…The contents of 1‐hexene or 1‐octene in copolymers were calculated by the following literature method where I CH3 and I CH2 represents the area of the methyl and methylene in the branched chain end of 1‐hexene or 1‐octene region respectively and I C2/C3 represents the area of the position C2 and C3 methine of norbornene.…”

Vinylic copolymerization of norbornene and higher 1-alkene with three-dimensional geometry binickel catalyst

“…2, the peaks at 0.9-1.0 ppm could be assigned to the hydrogen corresponding to 6′, the peaks at 1.0-1.5 ppm could be assigned to the hydrogen corresponding to 4/5/7/1′/3′/4′/5′, the peaks at 1.6-1.9 ppm could be assigned to the hydrogen corresponding to 3/6 and the peaks at 2.1-2.5 ppm could be assigned to the hydrogen corresponding to 1/2/2′, respectively. The content of 1-hexene in copolymers (see Table 1) could be calculated [39] and were (a) 9.2 %, (b) 20.1 %, (c) 25.3 %. Meanwhile, in Fig.…”