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Reactivities of fluorenyl species as ethylene oxide polymerization initiators—III. Kinetic studies with 9-methylfluorenyl alkali salts

✍ Scribed by D. Lassalle; S. Boileau; P. Sigwalt

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
321 KB
Volume
13
Category
Article
ISSN
0014-3057

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✦ Synopsis

It has been shown that initiation of the anionic polymerization of ethylene oxide by 9-methylfluorenyl alkali salts is a simple process of addition whereas side reactions occur for fluorenyl salts. Reactivities of different kinds of ionic species were determined by spectropbotometry in the case of 9-methylfluorenyl alkali salts in ethereal solvents at -30 °. The rate of cleavage of ethylene oxide is highly dependent on alkali cation. Contact ion pair reactivity decreases on increasing the bulkiness of the cation. Moreover free ions and separated ion pairs are less reactive than contact ion pairs. This behaviour might be explained by the important r61e of ethylene oxide as a strong coordinating agent with cations and also by the fact that 9-methylfluorenyl anion is quite delocalized.

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Reactivities of fluorenyl species as eth
Reactivities of fluorenyl species as ethylene oxide polymerization initiators—I. Ultraviolet and visible absorption spectra of 9-methylfluorenyl alkali salts
✍ D. Lassalle; S. Boileau; P. Sigwalt 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 252 KB

Al~tract--The behaviour of 9-methylfluorenyl alkali salts is nearly the same as that of the corresponding fluorenyl salts, as shown by studies of the effects of temperature, counterion and solvent on the ultraviolet and visible spectra. A marked shift in ). max on substituting a methyl group on the