Conclusions
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1.
The IR spectra of complexes of n-butyllithium (BuLi) with dimethyl ether and tetrahydrofuran were studied in the temperature interval −70 to +40° in isooctane. The limiting composition of the complexes corresponds to a ratio Li/ether=1.
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2.
The successive addition of (CH3)2O and THF molecules to the associate of BuLi was studied. Each successive ether molecule interacts less strongly with the BuLi tetramer than the preceding, and the enthalpy of addition of the fourth molecule is estimated at 5 kcal/mole.
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3.
Polymerization of butadiene was conducted on the system BuLi-ether. Tetrahydrofuran has a stronger influence on the polymerization than (CH3)2O.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1937–1942, September, 1972.
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Zgonnik, V.N., Kalnin'sh, K.K., Nikolaev, N.I. et al. Spectroscopic study of the complex formation of organolithium compounds with electron donors. Russ Chem Bull 21, 1881–1885 (1972). https://doi.org/10.1007/BF00854597
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DOI: https://doi.org/10.1007/BF00854597