Isopropyl p-nitrobenzoate

Isopropyl p-nitrobenzoate [13756-40-6] M 209.2, m 105-106 . Dissolved in diethyl ether, washed with aqueous alkali, then water and dried. Evapn of the ether and recrysln from EtOH gave pure material. 

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). 

The chain transfer constant of polystyrene radicals to ethylene-vinyl p-nitrobenzoate copolymer was compared with those to poly(vinyl p-nitrobenzoate) and their model compound, isopropyl p-nitrobenzoate. As expected, the value of chain transfer constant to the copolymer is larger than that to poly(vinyl p-nitrobenzoate) and smaller than that to the model compound isopropyl p-nitrobenzoate obtained according to the method of Mayo et al. (7) (Table 8). 

Table 8. Chain Transfer Constants of Polystyrene Radicals to Poly(vinyl p-Nitrobenzoate), Ethylene-Vinyl p-Nitrobenzoate Copolymer and Isopropyl p-Nitrobenzoate...

Ethylene-vinyl p-nitrobenzoate copolymer Isopropyl p-nitrobenzoate... 

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