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Anionic polymerization of isoprene in tetrahydrofuran: A study of isomerization reactions and ion-pair propagation rates

✍ Scribed by A. Garton; R.P. Chaplin; S. Bywater

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
349 KB
Volume
12
Category
Article
ISSN
0014-3057

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✦ Synopsis

The ion-pair propagation rates for isoprene have been determined in tetrahydrofuran with counter-ions lithium and sodium. Because of the instability of the carbonions of diene monomers in this solvent, a parallel spectroscopic study was carried out to check for the occurrence of side-reactions. With Li* counter-ion, the anions were found to be stable up to 0 but with Na +. instability was noticeable even at -40: and may be significant at even lower temperatures. For these reasons, the lithium ion-pair rates show normal bebaviour but those for sodium are difficult to interpret.

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