STEREOREGULAR FLUOROPOLYMERS .5. THE RING-OPENING POLYMERIZATION OF 2-TRIFLUOROMETHYLBICYCLO-[2.2.1]HEPTA-2,5-DIENE

2-Trifluoromethylbicyclo left bracket 2. 2. 1 right bracket hepta-2,5-diene undergoes metathesis ring-opening polymerization under the influence of the initiators WCl//6/(CH//3)//4Sn, MoCl//5/(CH//3)//4Sn, OsCl//3, RuCl//3, IrCl//3 and ReCl//5. Analysis of the infrared and high-field **1**3C-n. m. r. spectra of the different polymers leads to the following conclusions: the Mo based initiator gives predominantly trans-vinylene units; the Re based system shows the greatest tendency towards stereoregulation and gives predominantly cis-vinylenes; and the other catalysts are unselective in this respect.