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Träfflista för sökning "WFRF:(Yin Xiang) srt2:(2008-2009)"

Search: WFRF:(Yin Xiang) > (2008-2009)

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1.
  • Zhang, Xiang, et al. (author)
  • Asymmetric epoxidation of chromenes catalyzed by chiral pyrrolidine SalenMn(III) complexes with an anchored functional group
  • 2008
  • In: Applied organometallic chemistry. - : Wiley. - 0268-2605 .- 1099-0739. ; 22:10, s. 592-597
  • Journal article (peer-reviewed)abstract
    • Chiral pyrrolidine SalenMn(III) complexes with an anchored functional group at the N-aza-substituent in the pyrrolidine backbone were synthesized, and used as catalysts for asymmetric epoxidation of substituted chromenes. The complex 1 with an anchored imidazole as acceptor could effectively catalyze epoxidation of substituted chromenes in the absence of expensive additive 4-phenyl pyridine N-oxide (PPNO) by the coordination of the anchored organic base to the central manganese ion. Complexes 2 and 3 with a quaternary ammonium salt unit at the Naza-substituent in the pyrrolidine backbone displayed higher activities than Jacobsen catalyst and the analogous complex 4 without anchored functional group in the aforementioned reaction.
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2.
  • Zhang, Xiang, et al. (author)
  • Intramolecularly two-centered cooperation catalysis for the synthesis of cyclic carbonates from CO2 and epoxides
  • 2008
  • In: Tetrahedron Letters. - : Elsevier BV. - 0040-4039 .- 1359-8562. ; 49:46, s. 6589-6592
  • Journal article (peer-reviewed)abstract
    • A catalyst systern containing an electrophilic center and a sterically hindered nUcleophilic center in one molecule was applied to the cycloaddition reaction of CO2 and epoxides. This intramolecularly two-centered cooperation catalyst showed activity even at a high [epoxide]/[catalyst] ratio up to 50000 under mild conditions such as solvent-free, ambient temperature, and low CO2 pressure. The reaction of CO2 with (S)-propylene oxide at 80 degrees C in the presence of the bifunctional catalyst gives (S)-propylene carbonate in 96% ee with retention of stereochemistry.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Wang, Hui (2)
Sun, Licheng (2)
Zhang, Xiang (2)
Jia, Yin-Bao (2)
Lu, Xiao-Bing (2)
Li, Bo (1)
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Wang, Dong-Ping (1)
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University
Royal Institute of Technology (2)
Language
English (2)
Year
2008 (2)

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