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1. A Highly Atom Economic, Chemo-, Regio-and Stereoselective Synthesis and Crystal Structure of Novel Spiro-Cyclopentanone | |||
JIN Yijun,ZHANG Yali,LU Jinqiu,ZHAO Chengguang,YANG Shulin | |||
Chemical Engineering 12 March 2013 | |||
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Abstract:The 1,3-dipolar cycloaddition of azomethine ylides derived from acenaphthenequinone and α-amino acid(sarcosine) to a series of 2,5-bis(fluorobenzylidene)cyclopentanones afforded novel spiro-cyclopentanone-pyrrolizines chemo-, regio- and stereoselectively in quantitative yields (95-96%). The crystal structure of one compound containing bis(2,6-difluorobenzyl) (2b) is described. The cyclopentane rings in 2b have an envelope conformation | |||
TO cite this article:JIN Yijun,ZHANG Yali,LU Jinqiu, et al. A Highly Atom Economic, Chemo-, Regio-and Stereoselective Synthesis and Crystal Structure of Novel Spiro-Cyclopentanone[OL].[12 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528473 |
2. Highly Enantioselective HPLC Separation of 5-Methyl-5-phenylhydantoin on the Norvancomycin-bonded Chiral Stationary Phase | |||
Yang Yiwen,Su Baogen,San Hanwen,Ren Qilong | |||
Chemical Engineering 15 February 2007 | |||
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Abstract:Enantiomers of 5-Methyl-5-phenylhydantoin (MPH) were separated on norvancomycin chiral stationary phase (NVC-CSP), which was prepared by covalently linking norvancomycin to acid-treated silica gel. Three mobile phase modes have been investigated: reversed phase, polar organic mode, and normal phase. MPH may be enantioseparated under the reversed phase and polar organic mode. There is no enantioseparation under the normal phase. The effects of composition, column temperature, pH, and flow rate of mobile phase on the enantioseparation were investigated. The enantioseparation by methanol/2% TEAA (pH 5.5) 10/90 at the flow rate 0.6 ml/min and 20篊 is excellent. The hydrophobic interactions and hydrogen bonding are the dominant interactions on enantioseparations between the analyte and macrocycle in this chromatographic system. | |||
TO cite this article:Yang Yiwen,Su Baogen,San Hanwen, et al. Highly Enantioselective HPLC Separation of 5-Methyl-5-phenylhydantoin on the Norvancomycin-bonded Chiral Stationary Phase[OL].[15 February 2007] http://en.paper.edu.cn/en_releasepaper/content/11167 |
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