Conclusions
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1.
Under pulse conditions, 1,3,5-hexatriene on silica gel at 300 and 450°, and on MgO at 450°, undergoes catalytic C5- and C6-cylization with the formation of methylcyclopentadienes and cyclohexadienes. The latter are dehydrogenated to benzene, partially on silica gel and to a substantial degree on MgO.
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2.
The addition of H3PO4 to silica gel and to MgO increases the yield of cyclopentadienes, while the addition of KOH to MgO lowers the yield of cyclopentadienes and increases the yield of benzene.
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3.
Under the same conditions, 1,3-cyclohexadiene on silica gel is dehydrogenated to benzene, is hydrogenated to a much less degree to cyclohexene, and is isomerized to methylcyclopentadienes.
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Deceased.
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1543–1546, July, 1974.
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Rozengart, M.I., Bryukhanov, V.G., Polinin, V.L. et al. Catalytic C5- and C6-cyclization of 1,3, 5-hexatriene on silicon oxide and magnesium oxide. Russ Chem Bull 23, 1461–1464 (1974). https://doi.org/10.1007/BF00929652
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DOI: https://doi.org/10.1007/BF00929652