The chemistry of cyclopentadienyl nitrosyl and related complexes of molybdenum. Part 9. Reactions of bis(cyclopentadienyl) complexes with dienophilic acetylenes and olefins

Abstract

Reaction of [Mo(C₅H₅)₂I(NO)] with F₃CCCCF₃ and (NC)₂CC(CN)₂ affords [Mo(η⁵-C₅H₅){C₇H₅(CF₃)₂}I(NO)] and [Mo(η⁵-C₅H₅)I{C₇H₅(CN)₄}I(NO)], respectively. Treatment of [Mo(η⁵-C₅H₅)(σ-C₅H₅)(NO)(η²-S₂CNMe₂)] with RCCR (R = CF₃ or CO₂Me), (NC)₂CC(CN)₂, and maleic anhydride gives [Mo(η⁵-C₅H₅){C₇H₅R₂}(NO)(η²-S₂CNMe₂)], [Mo(η⁵-C₅H₅){C₇H₅(CN)₄}(NO)(η²-S₂CNMe₂)] and [Mo(η⁵-C₅H₅){C₇H₅(CO)₂O}(NO)(η²-S₂CNMe₂)]. In all of these complexes the acetylene or olefin has added in a Diels–Alder fashion to a cyclopentadienyl group, and in the first complex the F₃CCCCF₃ group is probably co-ordinated to the metal.