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The kinetics and machanism of the electrophilic substitution of heteroaromatic compounds. Part XXXI. The standardisation of acid catalysed hydrogen exchange rates

1973; Royal Society of Chemistry; Issue: 7 Linguagem: Inglês

10.1039/p29730001065

2050-8239

Ali El-Anani, John Banger, Giorgio Bianchi, Sérgio Clementi, C. D. Johnson, Alan R. Katritzky,

Analytical Chemistry and Chromatography

It is suggested that k0(100°) at pH = 0 should be used for correlations of hydrogen exchange rates. A procedure for obtaining these k0 values is given involving successive determination of (A)k(stoich)T°; (B)k(stoich)T° at pH = 0; (C)k(stoich)(100°) at pH = 0; (D) correction for minority species reaction; and (E) correction for isotope effects. This procedure is applied to available data.