Chain transfer reactions between compounds of transition metals and alkyls, haloalkanes of Group II -III metals play an important role in the catalysis of homogeneous polymerization of olefins . A special place among chain transfer reactions is occupied by the exchange reactions of zirconocene complexes and organoaluminum compounds of various structures. Despite the low activity of these systems in polymerization reactions, they are important for organic and organometallic chemistry. σ-Ligand exchange between metallocene dichloride-and organoaluminum compounds -based systems underlies the generation of hydride and alkyl organometallic complexes initiating the reactions of hydro-, carboand cyclometalation of alkynes and alkenes. Functionally substituted products of hydrometalation and carbometalation obtained in situ are important synthons for the organometallic synthesis of various classes of organic molecules . The nature of the interaction of metallocene complexes of zirconium and organoaluminum compounds has been studied in detail and continues to be studied by L.V. Parfenova with co-workers . However, there are no literature data on the study of the exchange reactions of zirconocene complexes with organocin reagents. Currently known examples of Cp 2 ZrCl 2 -catalyzed 2zincoethylzincation of 5-decyne and substituted 2-alkynylamines , as well as ethylzincation of terminal olefins serve as a reliable prerequisite for the alkylation of metallocene dichlorides using diethylzinc. The results of study of the alkylation of such organozirconium complexes as bis(cyclopentadienyl)hafnium dimethyl (Cp2HfMe2, 1Me2) and [N-