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Conventional methods to produce o-bromobenzenethiols involve addition of bromine to aniline, then using diazonium intermediates for addition of sulfur.

Determinations of the electrical conductivity of the diazonium chloride and nitrate also show that the diazonium radical is strictly comparable with other quaternary ammonium ions.

Oxyazo Compounds.—The oxyazo compounds are prepared by adding a solution of a diazonium salt to a cold slightly alkaline solution of a phenol.

The rapid addition of the diazonium salt solution to the sodium sulfite seems to be advantageous.

For these reasons, one must assume the existence of pentavalent nitrogen in the diazonium salts, in order to account for their basic properties.