The addition of an alkaline additive toγ-Al2O3 increases the yield of benzene from 1,3,5-hexatriene and 1,5-hexadiene. The yield of benzene from the hexadiene increases with increase in the basicity of the additive in the series: K2O, Rb2O, Cs2O, i.e., it enhances the dehydrocyclizing effect of the catalyst.
An increase in the basicity of the additive increases the yield of hexadienes from 1,3,5-hexatriene, and of hexenes from 1,5-hexadiene, i.e., it enhances the hydrogenating capacity of the catalyst.
The catalytic C5-cyclization of 1,3,5-hexatriene is suppressed completely, while that of 1,5-hexadiene is reduced sharply, when an alkaline additive is added toγ-Al2O3. The yield of methylcyclopentenes from 1,5-hexadiene is increased somewhat when the K2O in the catalyst is replaced by Rb2O or Cs2O.
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B. A. Kazanskii, M. I. Rozengart, V. L. Polinin, and V. G. Bryukhanov, Dokl. Akad. Nauk SSSR,212, 634 (1973).
M. I. Rozengart, V. L. Polinin, V. G. Bryukhanov, and B. A. Kazanskii, Dokl. Akad. Nauk SSSR,202, 608 (1973).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1894–1897, August, 1974.
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Rozengart, M.I., Bryukhanov, V.G., Polinin, V.L. et al. Effect of adding K2O, Rb2O, or Cs2O on catalytic transformations of 1,3, 5-hexatriene and 1,5-hexadiene in the presence of γ-Al2O3 . Russ Chem Bull 23, 1819–1821 (1974). https://doi.org/10.1007/BF00923223
- Additive Increase