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Supported sulfonic acids: Metal-free catalysts for the oxidation of hydroquinones to benzoquinones with hydrogen peroxide

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Title: Supported sulfonic acids: Metal-free catalysts for the oxidation of hydroquinones to benzoquinones with hydrogen peroxide
Authors: Maggi, Raimondo1 raimondo.maggi@unipr.it, Piscopo, Calogero G.1, Sartori, Giovanni1, Storaro, Loretta2, Moretti, Elisa2
Source: Applied Catalysis A: General. Jan2012, Vol. 411-412, p146-152. 7p.
Subjects: Sulfonic acids, Catalysts, Metals, Oxidation, Benzoquinones, Hydrogen peroxide
Abstract: Abstract: Some silica- and polystyrene-supported sulfonic acids, prepared by tethering or sol–gel techniques, were employed as metal-free heterogeneous catalysts in the oxidation of hydroquinones to the corresponding 1,4-benzoquinones, carried out with 30% aqueous hydrogen peroxide. The activity of these catalysts was tested in the model oxidation of methylhydroquinone under batch conditions: high yield and selectivity at room temperature and under environmentally friendly conditions can be achieved in the presence of SiO2–(CH2)3–SO3H. The heterogeneous catalyst, that can be easily recovered by simply filtration, can be used for at least three cycles affording the same good results (∼80% yield, ∼91% selectivity). [Copyright &y& Elsevier]
Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 69628238
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: <searchLink fieldCode="AR" term="%22Maggi%2C+Raimondo%22">Maggi, Raimondo</searchLink><relatesTo>1</relatesTo><i> raimondo.maggi@unipr.it</i><br /><searchLink fieldCode="AR" term="%22Piscopo%2C+Calogero+G%2E%22">Piscopo, Calogero G.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sartori%2C+Giovanni%22">Sartori, Giovanni</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Storaro%2C+Loretta%22">Storaro, Loretta</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Moretti%2C+Elisa%22">Moretti, Elisa</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+A%3A+General%22">Applied Catalysis A: General</searchLink>. Jan2012, Vol. 411-412, p146-152. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Sulfonic+acids%22">Sulfonic acids</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Metals%22">Metals</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Benzoquinones%22">Benzoquinones</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+peroxide%22">Hydrogen peroxide</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: Some silica- and polystyrene-supported sulfonic acids, prepared by tethering or sol–gel techniques, were employed as metal-free heterogeneous catalysts in the oxidation of hydroquinones to the corresponding 1,4-benzoquinones, carried out with 30% aqueous hydrogen peroxide. The activity of these catalysts was tested in the model oxidation of methylhydroquinone under batch conditions: high yield and selectivity at room temperature and under environmentally friendly conditions can be achieved in the presence of SiO2–(CH2)3–SO3H. The heterogeneous catalyst, that can be easily recovered by simply filtration, can be used for at least three cycles affording the same good results (∼80% yield, ∼91% selectivity). [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Catalysis A: General is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.apcata.2011.10.032
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 146
    Subjects:
      – SubjectFull: Sulfonic acids
        Type: general
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Metals
        Type: general
      – SubjectFull: Oxidation
        Type: general
      – SubjectFull: Benzoquinones
        Type: general
      – SubjectFull: Hydrogen peroxide
        Type: general
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              Text: Jan2012
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