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Organolithium addition to styrene and styrene derivatives: scope and limitations

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JournalJournal of the Chemical Society-Perkin Transactions 1
DatePublished - 2000
Issue number7
Number of pages8
Pages (from-to)1109-1116
Original languageEnglish

Abstract

Styrene and a range of aryl-substituted styrene derivatives are shown to undergo efficient carbolithiation-trapping reactions in diethyl ether at -78 to -25 degrees C. The reactivities of different types of organolithium reagents were found to be: tertiary, secondary > primary; much greater than alkenyl, methyl, phenyl. Electron donating groups (e.g. methoxy and dialkylamino) at the ortho- or para- positions of the benzene ring deactivate the double bond towards organolithium addition, but their reactions with butyllithium can be facilitated by using TMEDA as co-solvent. 2-Benzyloxystyrene and 2-allyloxystyrene undergo efficient carbolithiation at -78 degrees C, but at room temperature alkyl transfer occurs, generating the corresponding alkylated phenol. 2-Vinylnaphthalene also undergoes carbolithiation-carboxylation in reasonable yield.

    Research areas

  • CARBOLITHIATION, CYCLIZATION, ALKYLATION, CATALYST, ROUTE

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