quinones replacement of an aromatic amine by an hydroxyl group with water and sodium bisulfide in the Bucherer reaction thermal decomposition of aryl diazonium salts, the salts are converted to phenol by the oxidation of aryl silanes—an aromatic variation of the Fleming-Tamao oxidation catalytic synthesis from aryl bromides and iodides using nitrous oxide Classification There are various classification schemes. A commonly used scheme is based on the number of carbons and was devised by Jeffrey Harborne and Simmonds in 1964 and published in 1980: Drugs and bioactive natural products References Functional groups Disinfectants