Definition of "oxyazo" [oxyazo]

• In chem., a prefix showing that the compound named is an azo compound containing hydroxyl in one of the radicals, as in oxyazobenzene, C6H5N2C6H4.OH: same as hydroxyazo-, which is to be preferred. (noun)

The Century Dictionary (Public Domain)

• "It is essential that this solution should be tested before use, and this is carried out by coupling it with an alkaline phenol solution; if a dark blue oxyazo colour is formed, the solution may be used."
• "The oxyazo reaction only succeeds when the solution has been boiled with a few drops of hypochlorite solution, quickly cooled and excess of ammonia added."
• "The constitution of the oxyazo compounds has attracted much attention, some chemists holding that they are true azophenols of the type R·N_2·R_1·OH, while others look upon them as having a quinonoid structure, _i. e._ as being quinone hydrazones, type R·NH·N: R_1: O."