1-Hetero-1,3-dienes activated by nitrogen, oxygen or sulfur react with
bis(pyridine)iodonium(I) tetrafluoroborate (IPy(2)BF(4)) to give 3-io
dofunctionalized 1-hetero-1,3-dienes in good yields. The reaction take
s place in a single one-pot procedure at room temperature under mild c
onditions.