The understanding of functional groups is key for the understanding of all organic chemistry. In the tradition of the Patai Series each volume treats all aspects of functional groups. Each volume contains chapters on the theoretical and computational foundations; on analytical and spectroscopical aspects with dedicated chapters on Mass Spectrometry, NMR, IR/UV, etc.; on reaction mechanisms; on applications in syntheses. Each volume includes chapters on applications. Depending on the functional group there are usually chapters on industrial use, on effects in biological and/or environmental systems. The Patai Series has recently started to cover organo metal functional groups, and after visiting Lithium, Magnesium, Metal Enolates, the Editors have decided to look deeper into the chemistry of organo copper compounds.