Abstract
Pentacarbonylrhenium(I) halides, Re(CO)5X(X = Cl, Br or I), initiate the ring-opening polymerization of cyclohexene oxide photochemically without a co-catalyst at room temperature. The rate of polymerization is faster for X = Cl than it is for X = Br or I under comparable conditions. Replacement of the carbonyl ligand by pyridine or triphenylphosphine deactivates the catalyst. The effects of the halide ligand (X), photolysis times, photolysis light wavelength, catalyst concentration, and solvent polarity on the polymerization yield are reported and the mechanism of polymerization is suggested.
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