Intense, transient colours are produced during the nitrosation of a number of aromatic compounds. The spectrum of that obtained from 4-iodoanisole has been determined by stopped-flow spectrophotometry. The kinetics of the formation of the coloured species from 2-(4-iodophenoxy)ethanesulphonic acid in aqueous solution have been examined. It is concluded that the coloured species are σ-complexes.
A. R. Butler and A. P. Sanderson, J. Chem. Soc., Perkin Trans. 2, 1974, 1671 DOI: 10.1039/P29740001671
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