Regioselective --cyclohexylation of phenols with cyclohexanol in the presence of transition metal modified zeolite-Hβ

Raje, Vivek P.; Bhat, Ramakrishna P.; Samant, Shriniwas D.

doi:10.1016/j.molcata.2005.06.039

Cited by 2 publications

(3 citation statements)

References 19 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2-Phenylcyclohexanol could have been formed by pathways including dehydrogenation of 2-cyclohexylcyclohexane and hydrogenation of 2-phenylcyclohexanone. 2-Cyclohexylphenol could have been formed by alkylation of phenol, either with cyclohexanol or cyclohexene [26,27].…”

Section: Discussionmentioning

confidence: 99%

Cyclohexanone Conversion Catalyzed by Pt/γ-Al2O3: Evidence of Oxygen Removal and Coupling Reactions

et al. 2011

View full text Add to dashboard Cite

The conversion of cyclohexanone, often identified as an intermediate in the conversion of lignin-derived compounds, was catalyzed by Pt/c-Al 2 O 3 in the presence of H 2 at 573 K. Dehydrogenation was a kinetically significant reaction, indicated by a high selectivity for phenol. Oxygen-removal reactions are indicated by products including benzene, cyclohexene, and cyclohexene. Bimolecular reactions involving cyclohexanone and/or products of its conversion led to the formation of bicyclic C 12 compounds, with 2-cyclohexylcyclohexan-1-one and 2-phenylphenol being the most abundant. Increasing the H 2 partial pressure led to increased oxygen removal and faster formation of monocyclic and bicyclic hydrocarbons. At temperatures higher than 573 K, dehydrogenation became the dominant reaction class.

show abstract

Section: Discussionmentioning

confidence: 99%

Cyclohexanone Conversion Catalyzed by Pt/γ-Al2O3: Evidence of Oxygen Removal and Coupling Reactions

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Venkatesha et al reported that clays modified with sulfonic acids such as phenoldisulfonic acid and methanesulfonic acid were found to be more active than the zeolites for alkylation of p -cresol with cyclohexanol . Raje et al have also reported the regioselective o -cyclohexylation of phenol ( o -CP) with cyclohexanol by transition-metal-modified zeolite-Hβ . Among these solid acid catalysts, heteropolyacid (HPA) supported ZrO 2 , Al 2 O 3 , TiO 2 , and mesoporous SiO 2 have gained considerable importance for use as heterogeneous catalysts because of their high acidity. − Although several supports have been employed for immobilization of HPA, mesoporous silica molecular sieves have been found to be attractive because of their excellent surface properties.…”

Section: Introductionmentioning

confidence: 99%

“…Raje et al have also reported the regioselective o -cyclohexylation of phenol ( o -CP) with cyclohexanol by transition-metal-modified zeolite-Hβ . Among these solid acid catalysts, heteropolyacid (HPA) supported ZrO 2 , Al 2 O 3 , TiO 2 , and mesoporous SiO 2 have gained considerable importance for use as heterogeneous catalysts because of their high acidity. − Although several supports have been employed for immobilization of HPA, mesoporous silica molecular sieves have been found to be attractive because of their excellent surface properties. Various methods, including wet impregnation and nanoparticle-assisted stabilization, have been reported to impregnate HPAs into the porous channels of the mesoporous silicas, and these HPA-immobilized catalysts have been widely used as recyclable catalysts in various acid-catalyzed transformations .…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Mesoporous Siliceous Phosphotungstic Acid and Its Superior Catalytic Activity on the Cyclohexylation of Phenol

et al. 2021

View full text Add to dashboard Cite

The synthesis of highly active and reusable mesoporous siliceous phosphotungstic acid materials (mPTA-Si) which are prepared through a simple selfassembly between phosphotungstic acid (PTA), the polymeric surfactant, and the silica precursor assisted by KCl for cyclohexylation of phenol is reported. The surface area and the acidity of these materials are tuned with a simple adjustment of PTA in the silica framework. The prepared samples exhibit mesoporous structure with a high surface area, but the structure is collapsed when the loading of PTA is high. It is established that the Keggin structure of PTA is retained on the final mPTA-Si. mPTA-Si with different loadings of PTA are employed as the catalysts for the cyclohexylation of phenol under liquid phase conditions. Among the catalysts studied, 10.0-mPTA-8.3Si calcined at 350 °C is found to be highly active, selective, and recyclable and offers 100% conversion of phenol with the highest selectivity for p-cyclohexylphenol (96.8%).

show abstract

Regioselective --cyclohexylation of phenols with cyclohexanol in the presence of transition metal modified zeolite-Hβ

Cited by 2 publications

References 19 publications

Cyclohexanone Conversion Catalyzed by Pt/γ-Al2O3: Evidence of Oxygen Removal and Coupling Reactions

Cyclohexanone Conversion Catalyzed by Pt/γ-Al2O3: Evidence of Oxygen Removal and Coupling Reactions

Direct Synthesis of Mesoporous Siliceous Phosphotungstic Acid and Its Superior Catalytic Activity on the Cyclohexylation of Phenol

Contact Info

Product

Resources

About