Ключевые слова: New small ring building blocks and their application in the syntheses of natural and non-natural compounds; new higly strained polycyclic compounds with interesting properties; application of organometallic complexes and catalysts in organic synthesis; palladium-catalyzed sequential reactions; titanium-mediated cyclopropanation and other transformations of carbonyl compounds, and organometallic complexes with unconventional chemical and physical properties.