As early as 1866, tannic acid, gallic acid, wood spirit, acetic acid, essential oil and eucalyptol were produced from various species of eucalyptus, and researches made by Australian chemists, notably by Messrs.
It is soluble in water and possesses an odour resembling that of acetic acid.
6-dihydroxyxanthone, isoeuxanthone, is formed when 0-resorcylic acid is heated with acetic anhydride.
7-dihydroxyxanthone, known as euxanthone, is prepared by heating euxanthic acid with hydrochloric acid or by heating hydroquinone carboxylic acid with 3-resorcylic acid and acetic anhydride (S.
It may be prepared by the addition of potassium nitrite to an acetic acid solution of cobalt chloride.