Lodine tris

Dimerization of 1-iodoalkynes. Head-to-tail coupling gives 1,1-diiodoenynes. lodination. Arenes undergo iodination in CH2C12- Trifluoroacetic acid or tri-fluoromethanesulfonic acid may be used instead of tetrafluoroboric acid as catalyst. 

The electrophilic aromatic substitution of the pyridine ring continues to be explored as a way to prepare substituted pyridines. Bw-( 5y w-collidine)-iodine(I) and bromine (I) are effective iodinating or brominating agents, respectively, of pyridinols, although the di- or tri-halogenated products are obtained <97TL2467>. lodination of 3-pyridinol produces 5-hydroxy-... 

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