Conclusions
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1.
The cyanoaminocobaltate complex ions [Co(CN)3am]−, prepared by partial substitution of CN ligands in the [Co(CN)5]− complex by an amine (α,α′-dipyridyl, diethylenetriamine, ethylene- and propylenediamine), under mild conditions selectively catalyze the conversion of cis-1,3-pentadiene into the trans isomer.
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2.
The high stereoselectivity of the process is due to the coordination of the cis-diene with the complex in the more stable transoid conformation, and of the trans isomer in the less stable, cisoid conformation.
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3.
The cyanoaminocobaltate complex ions studied catalyze the selective hydrogenation of trans-1,3-pentadiene with a complete retention of the configuration, while [Co(CN)3en]− in an aqueous acetone directs the reaction exclusively in the direction of formation of 1-pentene.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 838–843, April, 1977.
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Freidlin, L.K., Gvinter, L.I. & Suvorova, L.N. Catalytic properties of cyanoaminocobaltate complex ions in hydrogenation reactions and cis-trans transformations of 1,3-pentadienes. Russ Chem Bull 26, 762–767 (1977). https://doi.org/10.1007/BF01108196
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DOI: https://doi.org/10.1007/BF01108196