Bonding in Electron-Rich Molecules : Qualitative Valence-Bond Approach via Increased-Valence Structures : Springer : 9783319166759 : 3319166751 : 10 Nov 2015 : This second edition was updated to include some of the recent developments, such as ?increased-valence? structures for 3-electron-3-centre bonding, benzene, electron conduction and reaction mechanisms, spiral chain O4 polymers and recoupled-pair bonding. The author provides qualitative molecular orbital and valence-bond descriptions of the electronic structures for primarily electron-rich molecules, with strong emphasis given to the valence-bond approach that uses ?increased-valence? structures. He describes how ?long-bond? Lewis structures as well as standard Lewis structures are incorporated into ?increased-valence? structures for electron-rich molecules. ?Increased-valence? structures involve more electrons in bonding than do their component Lewis structures, and are used to provide interpretations for molecular electronic st