**4. Conclusions**

Thus, Ti-Mg-catalyzed carbozincation of 1-alkynylphosphine sulfides with Et2Zn in a solution of diethyl ether proceeds in a stereoselective manner, while the use of methylene chloride, hexane, and toluene as solvents leads to the formation of a mixture of stereoisomers. In the present work, it was also demonstrated that the selective Ti-Mg-catalyzed 2-zincethylzincation of 2-alkynylamines and 1-alkynylphosphines is possible not only in diethyl ether, as we showed earlier [1], but also in such solvents as hexane, methylene, benzene, toluene, and anisole. This study opens up further prospects for the use of metal complex catalyzed organozinc synthesis to create new methods for the production of olefins based on various transformations of functionalized acetylene derivatives.

**Supplementary Materials:** The following are available online at http://www.mdpi.com/2073-4344/9/12/1022/s1, analytical data and NMR spetrum for all compounds.

**Author Contributions:** Conceptualization and methodology, A.M.G. and O.S.M.; investigation and writing—original draft preparation, R.N.K.; writing—review and editing, I.R.R. and U.M.D.

**Funding:** This work was financially supported by the Russian Science Foundation (grant No. 19-73-10113).

**Acknowledgments:** We acknowledge the Center of collective use of the unique equipment «Agidel» at the Institute of Petrochemistry and Catalysis of the Russian Academy of Sciences.

**Conflicts of Interest:** The authors declare no conflict of interest.
