Conclusions
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1.
1-Hexen-5-one in the presence of the triphenylphosphine complexes of Ru and Rh, in a H2 atmosphere, at 82°, is isomerized to give cis- and trans-2-hexen-5-one, and is reduced to 2-hexanone.
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2.
RuCl2(PPh3)3 catalyzes mainly the shift, while RhCl(PPh3)3 catalyzes mainly the reduction of the C=C bond of 1-hexen-5-one. The reduction is accomplished mainly via the transfer of hydrogen from a secondary alcohol.
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3.
The carbonyl group of 1-hexen-5-one is not reduced due to the predominant coordination of the unsaturated ketone via the C=C bond, and not via the C=O group.
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Literature cited
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Translated from Izvestiya Akademii. Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 575–578, March, 1976.
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Sharf, V.Z., Freidlin, L.K., Shekoyan, I.S. et al. Isomerization and reduction of 1-hexen-5-one in presence of RuCl2 (PPh3)3 and RhCl (PPh3)3 complexes. Russ Chem Bull 25, 557–560 (1976). https://doi.org/10.1007/BF01106652
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DOI: https://doi.org/10.1007/BF01106652