Ultraviolet irradiation, mostly in the presence of a peroxide, increases the electrical conductivity, thus produces oxidation ions in solutions of aromatic diols, to a lesser extent in those of monohydroxyl compounds, and to a still lesser, but measurable, extent in a hydrocarbon itself, namelyohyphen;xylene. Ultraviolet spectroscopy permits identification of the chief oxidation products:ohyphen;phthalic aldehyde in the case ofohyphen;xylene. The ions are probably oxidation intermediates of relative stability. Whereas the anion can be derived from the acids, the cations are probably oxoniumhyphen;type ions, derivable from theohyphen;aldehydes formed.
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