Polymerization of Phenylacetylenes with Rhodium Zwitterionic Complexes: Enhanced Catalytic Activity by π-Acidic Diene Ligands
datasetposted on 23.06.2009 by Naoya Onishi, Masashi Shiotsuki, Fumio Sanda, Toshio Masuda
Datasets usually provide raw data for analysis. This raw data often comes in spreadsheet form, but can be any collection of data, on which analysis can be performed.
Zwitterionic Rh catalysts bearing a series of tetrafluorobenzobarrelene (tfb) ligands proved to be highly active in the polymerization of phenylacetylenes. The highest catalytic activity for the polymerization of phenylacetylene was observed with (tfb)Rh+[(η6-Ph)B−Ph3] (1). Catalyst 1 displayed higher activity to produce higher molecular weight polymer than the conventional nbd analogue, (nbd)Rh+[(η6-Ph)B−Ph3] (5, nbd = 2,5-norbornadiene). In the case of other zwitterionic Rh catalysts bearing polymethylated tfb ligands [tfb-Me2, 2; tfb-Me3, 3; tfb-Me4, 4], the catalytic activity tended to decrease with increasing number of the incorporated methyl groups. Catalyst 1 also showed high activity in the polymerization of phenylacetylene derivatives irrespective of electron-donating or -withdrawing nature of ring-substituents of the monomers.