کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5201926 | 1502912 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Green synthesis of enantiomerically pure l-lactide and d-lactide using biogenic creatinine catalyst
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Green synthesis of enantiomerically pure l-lactide and d-lactide using biogenic creatinine catalyst Green synthesis of enantiomerically pure l-lactide and d-lactide using biogenic creatinine catalyst](/preview/png/5201926.png)
چکیده انگلیسی
Enantiomerically pure lactides of l-lactide (LLA) and d-lactide (DLA) were synthesized with high yield (68.5-69.5%) via depolymerization of oligo-poly-l-lactic acid (O-PLLA) and oligo-poly-d-lactic acid (O-PDLA) catalyzed by biogenic creatinine (CR). The structures of synthesized LLA and DLA were characterized with XRD analysis of the prepared single crystals. Gas chromatograph (with a chiral stationary phase capillary column) analysis demonstrated that the synthesized LLA and DLA possessed enantiomeric excess of 100%. The catalytic efficiency of the catalyst creatinine reached to a high level as observed by the turnover frequency in the range of 338.0-347.7Â hâ1. The residues of the depolymerization were utilized for resynthesizing of the enantiomerically pure lactides for 3 circles without the decrease in the yields of enantiomerically pure LLA/DLA. The catalyst we used in this research was biogenic and the process for lactide synthesis featured a closed-cycle without any waste release. A possible mechanism of CR-catalyzed LLA/DLA synthesis was proposed and discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 101, March 2014, Pages 18-23
Journal: Polymer Degradation and Stability - Volume 101, March 2014, Pages 18-23
نویسندگان
Wei Huang, Yunbiao Qi, Na Cheng, Xupeng Zong, Tianrong Zhang, Wei Jiang, Hong Li, Quanxing Zhang,