Conclusions
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1.
The reaction of tert-butyl-3-thienyl sulfone with excess n-butyllithium results in the predominant formation of the 2,4-dilithium derivative.
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2.
tert-Butyl(2,4-dilithium-S-thienyl) sulfone is stable and does not cleave the tert-butylsulfonyl group, in contrast to tert-butyl phenyl sulfone. The difference in the behavior of the sulfones of the benzene and thiophene series is an argument in support of the “arene” mechanism for the cleavage of the tert-butyl-sulfonyl group.
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See [1] for Communication 5.
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2285–2290, October, 1973.
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Stoyanovich, F.M., Gol'dfarb, Y.L. & Chermanova, G.B. Reaction of arylsulfonyl compounds with excess organolithium reagent. Russ Chem Bull 22, 2228–2232 (1973). https://doi.org/10.1007/BF01199616
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DOI: https://doi.org/10.1007/BF01199616