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13C NMR spectroscopy of the carbanion of indene as a function of temperature and counterion

✍ Scribed by J. van der Giessen; C. Gooijer; C. Maclean; N.H. Velthorst

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
243 KB
Volume
55
Category
Article
ISSN
0009-2614

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✦ Synopsis

The ion pairs of indenyl-lithium and -sodium in dimethosyetbane have been investigated by 13C NirlR as a function of temperature. The results are in liie with optical absorption measurements on these systems. Furthermore, they support the interpretation of the temperature dependence of the 'H chemical shif s in terms of a "direct" effect (a polarization of the carbon-proton bonds) and an "indirect" effect (a redistribution 0:' the excess negative chaqe in the anion) caused by the cation. The present paper demonstrates that *%I NblR is very appropriate to study cation-snion interactions.

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