Ju-Yeon Lee, I. Cho
1987
Citations
0
Influential Citations
2
Citations
Journal
Bulletin of The Korean Chemical Society
Abstract
2-Methoxy-6-methyl-3,4-dihydro-2H-pyran (), 2-ethoxy-3,6-dimethyl-3,4-dihydro-2H-pyran (), and 2-ethoxy-3-methyl-6-ethyl-3,4-dihydro-2H-pyran () were prepared by (4 + 2) cycloaddition reaction from the corresponding vinyl ketones and alkyl vinyl ethers. Compounds were ring-open polymerized by cationic catalyst to obtain alternating head-to-head (H-H) copolymers. For comparison, copolymer of head-to-tail (H-T) was also prepared by free radical copolymerization of the mixture of the corresponding monomers. The H-H copolymer exhibited some differences in its NMR and IR spectra. However, significant differences were showed between the H-H and H-T copolymers in the NMR spectra. Also noteworthy was that value of H-H copolymer was higher than that of the corresponding H-T structure. Decomposition temperature of the H-H copolymer was lower than that of the H-T copolymer. All the H-H and H-T copolymers were soluble in common solvents.