Separation and structural analysis by 1 H‐NMR of the telomers of methyl methacrylate with thiophenol
1988; Wiley; Volume: 26; Issue: 12 Linguagem: Inglês
10.1002/pola.1988.080261214
ISSN1099-0518
AutoresJean‐Marie Bessière, Bernard Boutevin, L. Sarraf,
Tópico(s)Electron Spin Resonance Studies
ResumoAbstract The stereoselectivity of the addition step and the transfer step of the radical telomerization of methyl methacrylate with thiophenol has been studied by determining the structure and the amount of each isomer by 1 H‐NMR. We found, in this case, that the addition step gave preferentially a diad r and that the transfer step gave preferentially a diad m. On the other hand, the tacticity observed for higher telomers is preferentially syndiotactic, similar to that of the poly(methyl methacrylate) prepared by radical initiation. The propagation process for radical telomerization obeys, as for the radical polymerization, Bernoulli's statistics.
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