Azoles are five-membered cyclic compounds containing one or more heteroatoms in the ring, at least one of which must be nitrogen. The rings contain the maximum number of non-cumulative double bonds consistent with the normal valencies of the ring atoms. This 1976 volume sets out in detail the structure and properties of these compounds and their derivatives. After an introduction and a section dealing with general physical properties there is an extensive discussion of electrophilic and nucleophilic substitution reactions. This is followed by a description of the types of reaction which modify the nucleus of the azole family. A short section on photochemical reactions compares those reactions which are not easy to classify with the thermolyses discussed in the previous chapter. To complete the work there is an extensive discussion of the properties of functional side groups and an extensive bibliography detailing about 1500 publications on azole chemistry.