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Polybenzimidazole‐Supported [Rh(cod)Cl] 2 Complex: Effective Catalyst for the Polymerization of Substituted Acetylenes
Author(s) -
Sedláček Jan,
Pacovská Marta,
Rédrová Dana,
Balcar Hynek,
Biffis Andrea,
Corain Benedetto,
Vohlídal Jiří
Publication year - 2002
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20020118)8:2<366::aid-chem366>3.0.co;2-9
Subject(s) - polymerization , phenylacetylene , polymer , polymer chemistry , catalysis , chemistry , monomer , molar mass distribution , solution polymerization , organic chemistry
Abstract The first heterogeneous catalyst which affords polymerization of substituted acetylenes into readily available high molecular weight polymers is reported. The catalyst (Rh/PBI) has been prepared by supporting di‐ μ ‐chlorobis( η 4 ‐cycloocta‐1,5‐diene)dirhodium( I ), [Rh(cod)Cl] 2 , on commercial polybenzimidazole (PBI) porous beads by means of a simple quantitative adsorption from THF solution, and tested in polymerization of phenylacetylene, 4‐fluorophenylacetylene, and 4‐pentylphenylacetylene. The polymer molecules formed were found to be released from the Rh/PBI to surrounding solution during the polymerization performed in THF. Formation of high molecular weight (〈 M 〉 w values up to 325 000) polymers in prevailing cis – transoid configuration has been observed with all monomers. In a comparison with free [Rh(cod)Cl] 2 used as the homogeneous catalyst, the Rh/PBI can be used repeatedly, exhibits somewhat lower polymerization activity but almost no oligomerization activity, and provides polymers of higher molecular weight.