Conclusions
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1.
Pyridine is hydrogenated to piperidine in the presence of Re2S7 (5–10% on the weight of pyridine) at 230–250°, a hydrogen pressure in excess of 100 atm, and a reaction time of 3–6 h, while in alcohol medium the piperidine also undergoes simultaneous N-alkylation.
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2.
In the indicated reactions the Re2S7, obtained from ammonium perrhenate by precipitation with H2S in acid medium, is twice as active as the sample that is obtained by the fusion of ammonium perrhenate with thiourea, and it is five times as active as ReS2.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1583–1587, July, 1973.
The authors express their gratitude to T. Ya Rubinskaya for assistance in determining rhenium by the polarographic method, and to V. V. Zaspykin for running the differential thermal analysis.
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Ryashentseva, M.A., Minachev, K.M. & Tsibizova, N.A. Hydrogenation of pyridine over rhenium sulfides. Russ Chem Bull 22, 1533–1536 (1973). https://doi.org/10.1007/BF00930056
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DOI: https://doi.org/10.1007/BF00930056