Enolonium Species-Umpoled Enolates

Shlomy Arava, Jayprakash N. Kumar, Shimon Maksymenko, Mark A. Iron, Keshaba N. Parida, Peter Fristrup, Alex M. Szpilman

Research output: Contribution to journalJournal articleResearchpeer-review


Enolonium species/iodo(III) enolates of carbonyl compounds have been suggested to be intermediates in a wide variety of hypervalent iodine induced chemical transformations of ketones, including α-C-O, α-C-N, α-C-C, and alpha-carbon- halide bond formation, but they have never been characterized. We report that these elusive umpoled enolates may be made as discrete species that are stable for several minutes at-78 degrees C, and report the first spectroscopic identification of such species. It is shown that enolonium species are direct intermediates in C-O, C-N, C-Cl, and C-C bond forming reactions. Our results open up chemical space for designing a variety of new transformations. We showcase the ability of enolonium species to react with prenyl, crotyl, cinnamyl, and allyl silanes with absolute regioselectivity in up to 92% yield.
Original languageEnglish
JournalAngewandte chemie-international edition
Pages (from-to)2599-2603
Publication statusPublished - 2017


  • allylation
  • enolonium species
  • ketones
  • polarity inversion
  • umpolung

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