Three fluorinated derivatives of benzonorbornadiene have been shown to undergo ring opening polymerization at the unsubstituted double bond in the presence of WCl6(CH3)4Sn and MoCl5(CH3)4Sn in chlorobenzene solution at room temperature. The proportion of cis-vinylene units (σc) in the resultant polymers is a function of monomer structure and catalyst, and in one case σcapproached zero; however, the distribution of meso- and racemic dyads in these polymers could not be determined with presently available techniques. © 1986.
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