The cationic polymerization of α- and β-pinene oxide has been studied. By use of boron trifluoride or phosphorus penta-fluoride these monomers may be oligomerized (DPn ≃ 6–7). According to 13C-NMR spectroscopy and other evidence, the four-membered ring present in these monomers opens or expands during reaction. The repeat structures of these polymers suggest a unique oxonium ion-carbenium ion propagation mechanism. Simultaneously with the oligomerization, these epoxides also yield large amounts of aldehydes by a related isomerization.
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Ruckel et al. (1976) studied this question.
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