New binary lanthanide catalysts for stereospecific diene polymerization
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New binary lanthanide catalysts composed of tetrahydrofuran adducts of lanthanide chlorides and triethylaluminum in hydrocarbon solvents which stereospecifically polymerize butadiene and isoprene are described. For example, the catalyst composed of NdCl3·2THF with Et3Al can be used to form both polybutadiene and polyisoprene with 97% and 95% cis-1,4 units, respectively, with good activity. The organometallic intermediates in these polymerizations have been shown to be reactive enough to be successfully quenched with carbon dioxide to form carboxylic acids. © 1982, American Chemical Society. All rights reserved.
author list (cited authors)
Yang, J. H., Tsutsui, M., Chen, Z., & Bergbreiter, D. E.