PHOTOCHEMICAL ARYLATION OF 2-IODO-5-NITROTHIOPHENE

The arylation of 2-iodo-5-nitrothiophene by a photochemical process ha s been investigated. This compound, in contrast with the photochemical behaviour of 5-iodothiophene-2-carbonitrile, gives the corresponding aryl and heteroaryl derivatives in good yields on irradiation in the p resence of various aromatic substrates (benzene, naphthalene, thiophen e). The photochemical reaction of 2-iodo-2-nitrothiophene in the prese nce of phenylacetylene gives the corresponding substitution product on the alkyne.