The principles of electronic structure form the foundation of understanding chemical reactivity in Organic Chemistry. Molecular orbitals, electron distribution, and the interplay between bonding and antibonding interactions dictate how molecules behave and transform during reactions. Concepts such as electron density, orbital overlap, resonance, and delocalization are central to predicting reaction pathways, stability of intermediates, and the overall outcome of chemical processes. Mastery of these principles allows chemists to rationalize and design reactions with greater precision and insight.

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This work was developed with the aim of serving as a facilitating tool for learning one of the foundations of Organic Chemistry, as well as to help address the shortage of national literature on the subject. It is intended for a diverse audience, ranging from undergraduate and graduate students to those who, even out of curiosity, wish to understand and deepen their knowledge of the different orbital interaction phenomena that occur in everyday chemical processes.