The Vinyl Reactivity of (Eta (5)-Vinylcyclopentadienyl) Dicarbonylnitrosylchromium. A Novel Vinyl Organometallic Monomer.
Interim technical rept.,
ALABAMA UNIV UNIVERSITY DEPT OF CHEMISTRY
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The novel vinyl organometallic monomer eta5-vinylcyclopentadienyl dicarbonylnitrosylchromium hereafter called vinylcynichrodene, recently prepared, was homopolymerized and copolymerized in the presence of azo initiators, both neat and in benzene solutions. Reactivity ratios were obtained in radical-initiated copolymerizations with styrene and N-vinyl-2-pyrrolidone. The resonance interaction parameter Q was 3.1 for vinylcynichrodene. Copolymerizations with N-vinyl-2-pyrrolidone M2 gave r1 - 5.3, r2 0.079 and e1 -2.07. Thus, it is clear that vinylcynichrodene is an exceptionally electron-rich vinyl monomer resembling vinylferrocene and vinylcymantrene. Vinylcynichrodene readily copolymerized with vinylcymantrene and homopolymerized in high yields in ethyl acetate solution. The molecular weight of polyvinylcynichrodene increased as the monomer to initiator ratio increased suggesting that the rate was not first order in initiator as had been found previously in vinylferrocene polymerizations.
- Polymer Chemistry