Pericyclic organometallic reactions. Cycloaddition reactions of (η-cycloheptatriene)Ru(CO)3. Crystal structure of tricarbonyl[(2,3,4,9-η)-bicyclo[4.2.1]non-2-ene-4,9-diyl-7,7,8,8-tetracarbonitrile]ruthenium |
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Authors: | Zeev Goldschmidt Elisheva Genizi Hugo E Gottlieb and Dafna Hezroni-Langermann Heinz Berke and H William Bosch Josef Takats |
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Institution: | Department of Chemistry, Bar-Ilan University, Ramat-Gan 52100 Israel Anorganisch-chemisches Institut der Universität Zürich, Winterturestr. 190, 8057 Zürich Switzerland Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2 Canada |
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Abstract: | (η4-Cycloheptatriene)Ru(CO)3 reacts with tetracyanoethylene (TCNE), 4-phenyltriazoline-3,5-dione (PTAD) and (carbomethoxy)maleic anhydride (CMA) to give stable 3 + 2 σ,π-allylic adducts. The 3 + 2 adduct with TCNE equilibrates via a 4,4]-sigmahaptotropic rearrangement with the less stable 6 + 2 adduct, which decomposes under the reaction conditions to the demetallated 6 + 2 adduct. It is concluded that σ,π-allylic adducts are in general more stable than their isomeric η4-π counterparts. The structure of the 3 + 2 TCNE adduct was determined by a single-crystal X-ray diffraction study. |
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