Abstract
The kinetics of hydrolysis of the two methoxy functions in the title compound 1 have been determined as a function of sulfuric acid concentration. Basicity constants for azo group protonation have been evaluated for 1 and several other (phenylazo)pyridines. The 4-OMe group in 1 hydrolyzes very readily in aqueous H 2 SO 4 at 25 o C (half-life, seconds to minutes); the 3-OMe group also hydrolyzes, but more slowly (half-life, hours to days). The results extrapolate to a reactivity difference of 7000 in pure water
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