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- W2023007512 abstract "The metallation of (alkylthio)fluorobenzenes by organolithium compounds, lithium amides and butyllithium/potassium tert-butoxide superbasic mixture was re-examined. To avoid the formation of defluorinated compounds all the reactions must be carried out below −80°C. The para-substituted 1a and 1b showed a regiochemistry directed by the halogen; the ortho-derivative 1c underwent metallation ortho to the halogen when treated with lithium tetramethylpiperidide, an α-metallation with butyllithium while sec-butyllithium was less selective. Compounds 1a and 1c allowed the preparation of disubstituted products. At temperatures higher than −80°C increasing amounts of dehalogenated products are formed, whose formation can be explained through the intermediacy of arynes." @default.
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- W2023007512 date "1999-09-01" @default.
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- W2023007512 title "Metallation reactions. XXV. A re-examination of the metallation reaction of (alkylthio)fluorobenzenes" @default.
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