30311-98-9Relevant articles and documents
Cyclohexylation of resorcinol with cyclohexanol catalyzed by tungstophosphoric acid supported zirconia catalysts
Balasubramanian,Devassay,Halligudi,Deepika,Umbarakar,Vinu
, p. 2986 - 2992 (2018/01/10)
We demonstrate a highly active and reusable heterogeneous catalyst system, tungstophosphoric acid (TPA) supported on zirconia (ZrO2), for the cyclohexylation of resorcinol by cyclohexanol to produce value added chemicals such as 2-cyclohexyl resorcinol, 4-cyclohexyl resorcinol and 3-Hydroxy cyclohexyl phenyl ether under liquid phase reaction condition. TPA/ZrO2 catalysts prepared with different TPA loadings (5-30 wt.%) by wet impregnation method and calcined in the temperature range of 650-850°C were characterized by Nitrogen sorption analysis, XRD, FTIR, DTG and DTA, and 31P MAS NMR spectroscopy. Among the catalysts studied, 15 wt.%TPA/ZrO2 catalyst calcined at 750°C gave the highest conversion of resorcinol (51.2%) with the selectivities for 3-Hydroxy cyclohexyl phenyl ether (53.9%) and 2-cyclohexyl resorcinol and 4-cyclohexyl resorcinol together (46.1%) under optimum reaction conditions. However, the selectivity of the products were controlled by varying the reaction conditions. At higher conversion of resorcinol (78.9%), only C-alkylated products were formed at 200°C with 15 wt.%TPA/ZrO2 catalyst calcined at 750°C. The combination of TPA and ZrO2 coupled with calcination temperature offered an excellent platform for the conversion of resorcinol into O-or C-alkylated products.
ALKYLATION OF PYROCATECHOL AND RESORCINOL WITH CYCLOHEXENE IN THE PRESENCE OF ALUMINUM PHENOLATE
Kozlikovskii, Ya. B.,Koshchii, V. A.,Butov, S. A.,Ovsiyuk, T. F.
, p. 746 - 749 (2007/10/02)
The alkylation of pyrocatechol and resorcinol with cyclohexene in the presence of aluminum phenolate leads to a mixture of isomeric mono- and dicyclohexyldihydroxybenzenes, in which as a rule the ortho-alkylation products predominate.
