Reactions of transition-metal .sigma.-acetylide complexes. 15. Cycloaddition of trans-1,2-bis(methoxycarbonyl)-1-cyanoethene: studies on the mode of ring opening of .sigma.-cyclobutenyl complexes. X-ray structures of two isomers of ruthenium complexes Ru{C:CPhCH(CO2Me)C(CN)(CO2Me)}(CO)(PPh3)(.eta.-C5H5), Ru{C[:C(CN)(CO2Me)]CPh:CH(CO2Me)}(CO)(PPh3)(.eta.-C5H5), and Ru{.eta.3-CH(CO2Me)CPhC:C(CN)(CO2Me)}(CO)(.eta.-C5H5)

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