Resumen: Silicon compounds play a very important function in different areas of chemistry due to their physicochemical properties, which include being hybrid compounds and thus affect many directions of application. Among them, the Cyclosiloxanes and silsesquioxanes that are used in this work are classical examples of those systems. Both have an inorganic core of Si-O-Si bonds with organic substituents at silicon atoms, resulting in different structures. The project presents basic literature on the chemistry of cyclosiloxanes and silsesquioxanes, the main methods of functionalization, and in the experimental part, the synthesis of T8 type silsesquioxanes and the catalytic reactivity of the Si-H compound in the hydrosilylation of tetravinylcyclotetrasiloxane is demonstrated.