P-Nitrophenyl isopropyl ether

As model compounds, we used isopropyl p-nitrobenzoate for poly(vinyl p-nitrobenzoate), p-nitrophenyl iaobutyrate for poly(p-nitrophenyl acrylate), p-nitrocumene for poly(p-nitrostyrene), and p-nitrophenyl isopropyl ether for poly(p-nitrophenyl vinyl ether). The structure and Hammett s a constants of these model compounds and the chain transfer constants of polystyrene radicals to these compounds are given in Table 5 (3). 

In the reaction of p-nitrophenyl isopropyl ether with radicals produced by the photo-induced decomposition of AIBN, the ESR spectrum obtained is very similar to that observed for p-nitrosophenyl isopropyl ether under similar reaction conditions. Accordingly, the ESR spectra observed for these compounds correspond to that for the nitroxide radicals(II) in the reaction scheme shown in Figure 3. 

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