This is a descriptive subject, where the main organic reactions of industrial application will be studied. There will be a description of the main industrial processes of preparation of organic Intermedia in order to know: a) the production and transformation processes of the most important organic chemicals, b) The main fields of application of the different products and industrial intermediates, c) The historical evolution of the main productive processes, d) The factors that determine changes and prospects for the future within the framework of sustainability and depletion of raw materials of fossil origin.