Synergistic catalysis of one-pot cascade reactions by acidic and basic binary porous polymers

Xiaochen Wang; Lingyu Zhang; Zengjing Guo; Yuming Shi; Yu Zhou; Jun Wang

doi:10.1016/j.apsusc.2019.01.217

Synergistic catalysis of one-pot cascade reactions by acidic and basic binary porous polymers

Xiaochen Wang, Lingyu Zhang, Zengjing Guo, Yuming Shi, Yu Zhou, Jun Wang

College of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

Acidic and basic porous polymers were facilely prepared through the radical copolymerization of target monomers and the crosslinker divinylbenzene (DVB), respectively. Combination of these polymers endowed highly efficient, heterogeneous recyclable acid-base binary catalysts for cascade deacetalization-Knoevenagel reaction, offering high yield and stable reusability. Binary polymers with strong acid sites and superior base sites afforded an unprecedented turnover frequency (TOF) in the condensation of benzaldehyde dimethylacetal and nitriles (285 h ⁻¹ for malononitrile and 57 h ⁻¹ for inert methylene substrate ethyl cyanoacetate). The excellent synergistically catalytic performance was ascribed to the unique self-protection effect of the in-situ formed acid and base sites embedded in the polymeric network. This study provided a facile, versatile and efficient strategy towards acid-base bifunctional heterogeneous catalysts by combining acidic and basic porous polymers.

Original language	English
Pages (from-to)	221-229
Number of pages	9
Journal	Applied Surface Science
Volume	478
DOIs	https://doi.org/10.1016/j.apsusc.2019.01.217
State	Published - 1 Jun 2019

Keywords

Acid-base binary catalysts
Cascade reaction
Heterogeneous catalysis
Porous polymer

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10.1016/j.apsusc.2019.01.217

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title = "Synergistic catalysis of one-pot cascade reactions by acidic and basic binary porous polymers",

abstract = " Acidic and basic porous polymers were facilely prepared through the radical copolymerization of target monomers and the crosslinker divinylbenzene (DVB), respectively. Combination of these polymers endowed highly efficient, heterogeneous recyclable acid-base binary catalysts for cascade deacetalization-Knoevenagel reaction, offering high yield and stable reusability. Binary polymers with strong acid sites and superior base sites afforded an unprecedented turnover frequency (TOF) in the condensation of benzaldehyde dimethylacetal and nitriles (285 h −1 for malononitrile and 57 h −1 for inert methylene substrate ethyl cyanoacetate). The excellent synergistically catalytic performance was ascribed to the unique self-protection effect of the in-situ formed acid and base sites embedded in the polymeric network. This study provided a facile, versatile and efficient strategy towards acid-base bifunctional heterogeneous catalysts by combining acidic and basic porous polymers.",

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doi = "10.1016/j.apsusc.2019.01.217",

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T1 - Synergistic catalysis of one-pot cascade reactions by acidic and basic binary porous polymers

AU - Wang, Xiaochen

AU - Zhang, Lingyu

AU - Guo, Zengjing

AU - Shi, Yuming

AU - Zhou, Yu

AU - Wang, Jun

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Acidic and basic porous polymers were facilely prepared through the radical copolymerization of target monomers and the crosslinker divinylbenzene (DVB), respectively. Combination of these polymers endowed highly efficient, heterogeneous recyclable acid-base binary catalysts for cascade deacetalization-Knoevenagel reaction, offering high yield and stable reusability. Binary polymers with strong acid sites and superior base sites afforded an unprecedented turnover frequency (TOF) in the condensation of benzaldehyde dimethylacetal and nitriles (285 h −1 for malononitrile and 57 h −1 for inert methylene substrate ethyl cyanoacetate). The excellent synergistically catalytic performance was ascribed to the unique self-protection effect of the in-situ formed acid and base sites embedded in the polymeric network. This study provided a facile, versatile and efficient strategy towards acid-base bifunctional heterogeneous catalysts by combining acidic and basic porous polymers.

AB - Acidic and basic porous polymers were facilely prepared through the radical copolymerization of target monomers and the crosslinker divinylbenzene (DVB), respectively. Combination of these polymers endowed highly efficient, heterogeneous recyclable acid-base binary catalysts for cascade deacetalization-Knoevenagel reaction, offering high yield and stable reusability. Binary polymers with strong acid sites and superior base sites afforded an unprecedented turnover frequency (TOF) in the condensation of benzaldehyde dimethylacetal and nitriles (285 h −1 for malononitrile and 57 h −1 for inert methylene substrate ethyl cyanoacetate). The excellent synergistically catalytic performance was ascribed to the unique self-protection effect of the in-situ formed acid and base sites embedded in the polymeric network. This study provided a facile, versatile and efficient strategy towards acid-base bifunctional heterogeneous catalysts by combining acidic and basic porous polymers.

KW - Acid-base binary catalysts

KW - Cascade reaction

KW - Heterogeneous catalysis

KW - Porous polymer

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VL - 478

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JO - Applied Surface Science

JF - Applied Surface Science

ER -

Synergistic catalysis of one-pot cascade reactions by acidic and basic binary porous polymers

Abstract

Keywords

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