Progress in Heterocyclic Chemistry (PHC) is an annual review series commissioned by the International Society of Heterocyclic Chemistry (ISHC). Volumes in the series contain both highlights of the previous year's literature on heterocyclic chemistry and articles on emerging topics of particular interest to heterocyclic chemists. The chapters in Volume 22 constitute a systematic survey of the important original material reported in the literature of heterocyclic chemistry in 2009. - Covers the heterocyclic literature published in 2009 - Includes specialized reviews - Features contributions from leading researchers in their fields