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The reaction of phenyliodonium bis(phenylsulfonyl)methylide with flavones affords insertion products into the alkenyl carbon-hydrogen bond of the flavone, presumably by an electrophilic attack of the iodonium ylide on the double bond of the flavone.
Iodonium ylide 2, derived from dimedone, undergoes thermal [3+2]-cycloaddition with acetylenes and nitriles with Rh 2 (OAc) 4 to form the corresponding furans and oxazoles, respectively. Photochemically 2 reacts with various alkenes to form E-dihydrofuran derivatives.
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