Halogenation of Alkynes

Abstract

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Electro-alkynylation: Intramolecular Rearrangement of Trialkynylorganoborates for Chemoselective C(sp2)–C(sp) Bond Formation

“…Alkynes are also often used as versatile intermediates in synthesis, constituting reactive moieties in stereoselective hydrogenations, 7 halogenations, 8 (3 + 2)-Huisgen cycloadditions, 9 hydro- 10 and carbometalations, 11 gold-catalyzed rearrangements, 12 and cyclopropenations. 13 Classical methods for their construction comprise wellestablished Corey−Fuchs reactions of aldehydes, 14 Seyferth− Gilbert homologations of ketones, 15 Fritsch−Buttenberg− Wiechell rearrangements, 16 Pd-catalyzed Sonogashira couplings of terminal alkynes, 17 or simple 1,2-eliminations.…”

“…Alkynes are also often used as versatile intermediates in synthesis, constituting reactive moieties in stereoselective hydrogenations, halogenations, (3 + 2)-Huisgen cycloadditions, hydro- and carbometalations, gold-catalyzed rearrangements, and cyclopropenations …”