Phosphotungstic acid on silica with modified acid sites as a solid catalyst for selective cleavage of tert-butyldimethylsilyl ethers

Bhure, Mahesh H.; Kumar, Indresh; Natu, Arun D.; Chikate, Rajeev C.; Rode, Chandrashekhar V.

doi:10.1016/j.catcom.2008.03.017

Cited by 30 publications

(13 citation statements)

References 16 publications

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“…The strong interaction leads to different acid species in comparison with the bulk PTA. From the reference [31], the supported PTA exhibits much weaker acid strength than the bulk PTA, which supports our above proposal.…”

Section: Effect Of Pta Loadingsupporting

confidence: 90%

Supported phosphotungstic acid catalyst on modified activated carbon for Friedel–Crafts alkenylation of diverse aromatics to their corresponding α-arylstyrenes

Zhao

Wang

2015

Applied Catalysis A: General

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Section: Effect Of Pta Loadingsupporting

confidence: 90%

Supported phosphotungstic acid catalyst on modified activated carbon for Friedel–Crafts alkenylation of diverse aromatics to their corresponding α-arylstyrenes

Zhao

Wang

2015

Applied Catalysis A: General

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“…Meanwhile, a proposed reaction mechanism between Nafion, SiOH and PWA is presented in Eqs. (1) and (2) [8,9].…”

Section: Introductionmentioning

confidence: 98%

Nafion/silicon oxide/phosphotungstic acid nanocomposite membrane with enhanced proton conductivity

Mahreni

Mohamad

Kadhum

et al. 2009

Journal of Membrane Science

116

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“…So, designing and developing catalysts with proper acidity and strength is still a subject of great interest. In this context, heteropoly acids and clays are excellent alternatives to the conventional reagents, and are widely used in various organic transformations [32][33][34][35][36][37][38][39]. Among all the known structures of heteropolyacids, Keggin-type heteropolyacids are widely used as catalysts for several organic transformations due to the ease of their preparation, strong acidity and chemical stability [40,41].…”

Section: Introductionmentioning

confidence: 99%

Solid Acid Catalysts: Modification of Acid Sites and Effect on Activity and Selectivity Tuning in Various Reactions

2009

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The effects of acidity and variation in concentration of acid sites of dodecatungstophosphoric acid (DTP), supported DTP and montmorillonite-K catalysts were studied for various organic reactions such as the hydroxyalkylation of phenols to bisphenols, intramolecular rearrangement of benzyl phenyl ether (BPE) to 2-benzyl phenol (2-BP) and selective cleavage of tert-butyldimethylsilyl (TBDMS) ether into the corresponding alcohol. Both dodecatungstophosphoric acid (DTP) impregnated on silica (SiO 2 ) and montmorillonite catalysts showed the highest catalyst activity with 90-95% selectivity to bisphenol for the hydroxyalkylation of phenols to give bisphenol. Temperature Programmed Desorption (TPD) of ammonia and activity results of various catalysts showed that an appropriate combination of both strong and weak acidic sites in the catalyst was highly desirable for high bisphenol selectivity. A 10% DTP/SiO 2 catalyst was found to be highly selective for the cleavage of TBDMS ether into the corresponding alcohol at room temperature giving a high TON of 9.5 9 10 5 even after the 4th recycle. DTP was also found to be a promising solid acid catalyst for the intramolecular rearrangement of BPE giving 2-BP.

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Phosphotungstic acid on silica with modified acid sites as a solid catalyst for selective cleavage of tert-butyldimethylsilyl ethers

Cited by 30 publications

References 16 publications

Supported phosphotungstic acid catalyst on modified activated carbon for Friedel–Crafts alkenylation of diverse aromatics to their corresponding α-arylstyrenes

Supported phosphotungstic acid catalyst on modified activated carbon for Friedel–Crafts alkenylation of diverse aromatics to their corresponding α-arylstyrenes

Nafion/silicon oxide/phosphotungstic acid nanocomposite membrane with enhanced proton conductivity

Solid Acid Catalysts: Modification of Acid Sites and Effect on Activity and Selectivity Tuning in Various Reactions

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