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Irradiation (λmax = 300−375 nm) of FvRu2(CO)4 (1, Fv = η5:η5-bicyclopentadienyl) or (μ2-η1:η5-cyclopentadienyl)2Ru2(CO)4 (2) with dimethyl cis- or trans-butenedioate resulted in FvRu2(η2-trans-CHRCHR)(CO)3 (3, R = CO2CH3). Prolonged irradiation of 1−3 provided FvRu2(η2-trans-CHRCHR)2(CO)2 (4a, R = CO2CH3) and FvRu2(η2-cis-CHRCHR)(η2-trans-CHRCHR)(CO)2 (4b, R = CO2CH3). Photocatalytic isomerization of cis to trans alkene occurred in the presence of 1−4. Irradiation of 1−3 with dimethyl butynedioate produced FvRu2(μ2-η2-dimethyl butynedioate)(CO)3 (5). Prolonged irradiation of 1−5 with the alkyne afforded FvRu2(μ2-η2:η4-CRCRCRCR)2(CO) (6, R = CO2CH3). Irradiation of a THF solution of 6 generated FvRu2(μ2-η2:η4-CRCRCRCR)2(THF) (7, R = CO2CH3). Photochemical alkyne cyclotrimerization was observed in the presence of 1−7. In the presence of CO, 7 reverted to 6 thermally. Heating 7 in the presence of dimethyl cis-butenedioate, thiophene, PPh3, or dimethyl sulfoxide (DMSO) afforded FvRu2(μ2-η2:η4-CRCRCRCR)2(L) (8...

organometallics

Photosubstitution of (Fulvalene)tetracarbonyldiruthenium by Alkenes and Alkynes: First Observation of Alkyne Coupling on Fulvalene Dimetals and Synthesis of a (Fulvalene)dimetallacyclopentadiene(alkene) Complex