Isopropyl vinyl ether

Methyl vinyl ether Ethyl vinyl ether Isopropyl vinyl ether -Butyl vinyl ether Isobutyl vinyl ether... 

Isopropylacrylaldehyde oxime, 2453 f Isopropyl vinyl ether, 1957 f Isovaleraldehyde, 1958 Limonene, 3337... 

Table 5-3 shows the order of reactivity of monomers in propagation. It is not a simple matter to explain the order of propagation rate constants for a set of monomers because there are variables—the reactivity of the monomer and the reactivity of the carbocation. For example, carbocation stability is apparently the more important feature for isopropyl vinyl ether and results in decreasing its propagation reactivity compared to isobutylene. 

TABLE 5-8 Effect of Solvent on kp in Radiation Polymerization of Isopropyl Vinyl Ether at 30° C ... 

Isopropyl-2-methyl-l,3-cyclohexadiene, see 1,5-p-Menthadiene, 3332 f Isopropyl nitrate, 1262 f Isopropyl nitrite, 1258 f Isopropyl propionate, 2498 f Isopropyl vinyl ether, 1951... 

The energies of activation of vinyl ether polymerizations are much larger isobutyl and isopropyl vinyl ether E = 21 kJmol-1 ethyl vinyl ether Ea 54 kJ mol This indicates that carbenium ions of vinyl ethers are less reactive, probably due to an equilibrium with dormant oxonium ions formed by an intramolecular cyclization [Eq. (67)]. The overall activation energies should also increase to more positive values if formation of the active carbenium ions is endothermic. 

---