The .alpha.- versus .beta.-elimination reaction of (Z)-(.beta.-halovinyl)iodonium salts: generation of .alpha.-haloalkylidene carbenes and their facile intramolecular 1,2-migration
Michael type addition of halides to alkynyl(phenyl)iodonium tetrafluoroborates. Stereoselective synthesis of (Z)-β-halovinyl(phenyl)iodonium halides
摘要:
Michael type addition of halide ions (Cl- and Br-) to alkynyl(phenyl)iodonium tetrafluoroborates (1) under acidic conditions proceeds in a completely stereoselective manner and affords (Z)-beta-halovinyl(phenyl)iodonium halides (2), potential progenitors for generating alpha-haloalkylidenecarbenes, in high yields.