Complex formation is widely used as a method of directed change of rate and selectivity of polymerization processes and structure of the obtained polymer. Introduction of complex formation can cause significant influence on reaction ability of monomers. The given work concerns the study of complex formation of Et₂ AlCl with nitrils. Nitrils CH₂ = CHCN and others have two reaction centers, capable to complex formation with t₂ AlCl : CN group and C=C contact.