Reactions of co-ordinated ligands. Part 19. Insertion reactions of acetylenes, methylenecyclopropane, and buta-1,3-diene with tricarbonyl(η5-indenyl)methylmolybdenum and dicarbonyl(η5-indenyl)methyliron

Abstract

Reaction of [MoMe(CO)(η⁶-C₉H₇)] with but-2-yne affords the vinyl ketone complex [[graphic omitted]}(CO)₂(η⁵-C₉H₇)]. In contrast, 3,3-dimethylbut-1-yne reacts under similar conditions to give consecutively [[graphic omitted]}(CO)₂(η⁵-C₉H₇)] and the η³-pyranyl complex [Mo{η³-[graphic omitted]}(CO)₂(η⁵-C₉H₇)]. But-2-yne and 3,3-dimethylbut-1-yne react with [FeMe(CO)₂(η⁵-C₉H₇)] to give the corresponding vinyl ketone complexes. Methylenecyclopropane reacts slowly with [MoMe(CO)₃(η⁵-C₉H₇)] to give the 1,2-ring-opened complex [Mo{η³-anti-CH(Me)C(COMe)CH₂}(CO)₂(η⁵-C₉H₇)] and with buta-1,3-diene to afford [Mo{η³-CH₂CHCHCH₂(COMe)}(CO)₂(η⁵-C₉H₇)]. The mechanism of formation of these products is discussed.