- Cyclohexylation of resorcinol with cyclohexanol catalyzed by tungstophosphoric acid supported zirconia catalysts
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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.
- Balasubramanian,Devassay,Halligudi,Deepika,Umbarakar,Vinu
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- Abnormal Cannabidiols as agents for lowering intraocular pressure
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The present invention provides a method of treating glaucoma or ocular hypertension which comprises applying to the eye of a person in need thereof an amount sufficient to treat glaucoma or ocular hypertension of a compound of formula I wherein Y, Q, Z, R, R1 and R2 are as defined in the specification. The present invention further comprises pharmaceutical compositions, e.g. ophthalmic compositions, including said compound of formula I.
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Page/Page column 8
(2008/06/13)
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- Synthesis of cyclohexylphenols
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Catalytic alkylation of phenols with cyclohexanol gives o- and p-cyclohexylphenols as the major products. The effect of temperature, catalyst nature, and reactant concentration on the reaction outcome was studied.
- Postnova,Koshel',Lebedeva,Kuznetsova,Koshel'
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p. 1415 - 1417
(2007/10/03)
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- Resorcinol derivatives
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The present invention relates to the use of certain resorcinol derivatives as skin lightening agents.
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- Resorcinol derivatives
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The present invention relates to the use of certain resorcinol derivatives as skin lightening agents.
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- ALKYLATION OF PYROCATECHOL AND RESORCINOL WITH CYCLOHEXENE IN THE PRESENCE OF ALUMINUM PHENOLATE
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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.
- Kozlikovskii, Ya. B.,Koshchii, V. A.,Butov, S. A.,Ovsiyuk, T. F.
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p. 746 - 749
(2007/10/02)
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- Vat dye and sulfur dye compositions
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Specific vatting accelerators according to claims 1 and 2 are described. These can be added to a vat dye or sulfur dye composition, or to a dye bath or printing paste containing a vat dye or sulfur dye, by virtue of which an improvement of dye yield, particularly on cellulose materials, is obtained.
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