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À propos de : Reaction of Cp*(CO)2ReRe(CO)2Cp* with AlkynesProduces DimetallacyclopentenonesCp*(CO)2Re(μ-η1,η3-CRCR‘CO)Re(CO)Cp* Which Reactwith Acid To Form Cationic Bridging Vinyl Complexes        

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  • Reaction of Cp*(CO)2ReRe(CO)2Cp* with AlkynesProduces DimetallacyclopentenonesCp*(CO)2Re(μ-η1,η3-CRCR‘CO)Re(CO)Cp* Which Reactwith Acid To Form Cationic Bridging Vinyl Complexes
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  • Cp*(CO)2ReRe(CO)2Cp*reacted with terminal alkynes HC⋮CR to producedimetallacyclopentenonesCp*(CO)2Re(μ-η1,η3-CHCRCO)Re(CO)Cp*.Protonation of the dimetallacyclopentenones withCF3CO2H produced (μ-vinyl)dirheniumcations[Cp*(CO)2Re(μ-η1,η2-CHCHR)Re(CO)2Cp*]+.
  • Cp*(CO)2ReRe(CO)2Cp*(1) reacted with terminal alkynes HC⋮CR (R = H,CH3, C6H5,C(CH3)CH2,OCH2CH3) to producedimetallacyclopentenonesCp*(CO)2Re(μ-η1,η3-CHCRCO)Re(CO)Cp* (4−8). Thereaction of 1 with alkynes having one ester substituent alsogavedimetallacyclopentenones. Reaction of 1 withHC⋮CCO2Me gaveCp*(CO)2Re[μ-η1,η3-CHC(CO2CH3)CO]Re(CO)Cp* (9)and with CH3C⋮CCO2Me gaveCp*(CO)2Re[μ-η1,η3-(CO2CH3)CC(CH3)CO]Re(CO)Cp*(10). At low temperature, the η2-propynecomplex Cp*(CO)2Re(μ-CO)Re(CO)(HC⋮CCH3)Cp*(12) andCp*(CO)2Re[μ-η1,η3-C(CH3)CHCO]Re(CO)Cp*(11) were observed as intermediates in the formation ofCp*(CO)2Re[μ-η1,η3-CHC(CH3)CO]Re(CO)Cp* (5). Protonation ofdimetallacyclopentenone 2 withCF3CO2H produced[Cp*(CO)2Re(μ-η1,η2-CHCH2)Re(CO)2Cp*]+CF3CO2-(14), a species with a bridging vinylgroup. Protonation of the thermodynamically favored regioisomericdimetallacyclopentenone5 gave[Cp*(CO)2Re(μ-η1,η2-(E)-CHCHCH3)Re(CO)2Cp*]+CF3CO2-(15). Protonation ofkinetically formed regioisomeric dimetallacyclopentenone 11at low temperature gave [Cp*(CO)2Re(μ-η1,η2-CCH3CH2)Re(CO)2Cp*]+CF3CO2-(16).
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