13C NMR spectra and reactivity in cationic polymerization of vinyl and alkenyl ethers
β Scribed by Higashimura, T. ;Okamura, S. ;Morishima, I. ;Yonezawa, T.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1969
- Tongue
- English
- Weight
- 162 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0449-2986
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## Abstract **Summary:** Vinyl ether oligomers with reactive end groups were prepared by alkylation of silyl enol ethers during propagation. Silyl enol ethers were added to the cationic polymerization of isobutyl vinyl ether, ethyl vinyl ether and methyl vinyl ether. The polymerizations were carrie
## Abstract The ^17^O NMR spectra of 58 Ξ±,Ξ²βunsaturated (vinyl) ethers were recorded in CDCl~3~ solution. The dependence of the chemical shift on the number and position of alkyl substituents in the vinyl moiety and on the nature and bulkiness of the alkoxy group was explored. The oxygen chemical s
## Abstract The structures of cyclic polyketones, their hydrates and reduction products were studied in different solvents by ^13^CβNMR. spectroscopy. In dimethylsulfoxide solution rhodizonic acid **(1)**, croconic acid **(2)** and squaric acid **(3)** exhibit signal averaging. In anhydrous tetrahy