S. Lunak et al., PHOTOCHEMICAL HYDROXYLATION OF SALICYLIC-ACID DERIVATIVES WITH HYDROGEN-PEROXIDE, CATALYZED WITH FE(III) AND SENSITIZED WITH METHYLENE-BLUE, Collection of Czechoslovak Chemical Communications, 59(4), 1994, pp. 905-912
Substitution of hydrogen in the carboxy or hydroxy group of a salicyli
c acid molecule with a methyl group, which hinders the coordination of
Fe(III), results in a pronounced reduction of photocatalytic effects.
The complex of Fe(III) with salicylic acid is the precursor of the th
ermal catalyst arising on irradiation.