Junliang Sun

Publications (73) View all

• Article: A Palladium/Chiral Amine Co-catalyzed Enantioselective Dynamic Cascade Reaction: Synthesis of Polysubstituted Carbocycles with a Quaternary Carbon Stereocenter.

  Guangning Ma, Samson Afewerki, Luca Deiana, Carlos Palo-Nieto, Leifeng Liu, Junliang Sun, Ismail Ibrahem, Armando Córdova
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  ABSTRACT: Polysubstituted 5- and 6-membered carbocycles were synthesized by the title reaction. The one-pot dynamic relay process generates four new stereocenters, including a quaternary carbon center, in a highly enantioselective fashion (99.5:0.5→99:0.5 e.r.) by using a simple combination of palladium and chiral amine co-catalysts.
  Angewandte Chemie International Edition 04/2013; · 13.45 Impact Factor
• Article: A Tailor-Made Molecular Ruthenium Catalyst for the Oxidation of Water and Its Deactivation through Poisoning by Carbon Monoxide.

  Markus D Kärkäs, Torbjörn Akermark, Hong Chen, Junliang Sun, Björn Akermark
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  ABSTRACT: No CO-operation: Two single-site ruthenium complexes, based on a tetradentate ligand, despite structural similarities, display a remarkable difference in their catalytic and chemical behavior. The fact that the CO-containing complex is formed in the catalytic oxidation of water suggests a novel pathway for the deactivation of ruthenium-based catalysts.
  Angewandte Chemie International Edition 03/2013; · 13.45 Impact Factor
• Article: Irreversible Network Transformation in a Dynamic Porous Host Catalyzed by Sulfur Dioxide

  Sihai Yang, Leifeng Lu, Junliang Sun, K. Mark Thomas, Andrew J. Davies, Michael W. George, Alexander J. Blake, Adrian H. Hill, Andrew N. Fitch, Chiu C. Tang, Martin Schröder
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  ABSTRACT: Porous NOTT-202a shows exceptionally high uptake of SO2, 13.6 mmol g–1 (87.0 wt %) at 268 K and 1.0 bar, representing the highest value reported to date for a framework material. NOTT-202a undergoes a distinct irreversible framework phase transition upon SO2 uptake at 268–283 K to give NOTT-202b which has enhanced stability due to the formation of strong π···π interactions between interpenetrated networks.
  Journal of the American Chemical Society 03/2013; 135(13):4954. · 9.91 Impact Factor
• Article: Irreversible Network Transformation in a Dynamic Porous Host Catalysed by Sulphur Dioxide.

  Sihai Yang, Leifeng Liu, Junliang Sun, K Mark Thomas, Andrew J Davies, Michael William George, Alexander J Blake, Adrian H Hill, Andrew N Fitch, Chiu C Tang, Martin Schröder
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  ABSTRACT: Porous NOTT-202a shows exceptionally high uptake of SO2, 13.6 mmol g-1 (87.0 wt%) at 268 K and 1.0 bar representing the highest value reported to date for a framework material. NOTT-202a undergoes a distinct irreversible framework phase transition upon SO2 uptake at 268-283 K to give NOTT-202b which has enhanced stability due to the formation of strong π•••π interactions between interpenetrated networks.
  Journal of the American Chemical Society 03/2013; · 9.91 Impact Factor
• Article: Synthesis of an extra-large molecular sieve using proton sponges as organic structure-directing agents.

  Raquel Martínez-Franco, Manuel Moliner, Yifeng Yun, Junliang Sun, Wei Wan, Xiaodong Zou, Avelino Corma
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  ABSTRACT: The synthesis of crystalline microporous materials containing large pores is in high demand by industry, especially for the use of these materials as catalysts in chemical processes involving bulky molecules. An extra-large-pore silicoaluminophosphate with 16-ring openings, ITQ-51, has been synthesized by the use of bulky aromatic proton sponges as organic structure-directing agents. Proton sponges show exceptional properties for directing extra-large zeolites because of their unusually high basicity combined with their large size and rigidity. This extra-large-pore material is stable after calcination, being one of the very few examples of hydrothermally stable molecular sieves containing extra-large pores. The structure of ITQ-51 was solved from submicrometer-sized crystals using the rotation electron diffraction method. Finally, several hypothetical zeolites related to ITQ-51 have been proposed.
  Proceedings of the National Academy of Sciences 03/2013; 110(10):3749-54. · 9.68 Impact Factor