کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
58458 | 47152 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New highly enantioselective thiourea-based bifunctional organocatalysts for nitro-Michael addition reactions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: New highly enantioselective thiourea-based bifunctional organocatalysts for nitro-Michael addition reactions New highly enantioselective thiourea-based bifunctional organocatalysts for nitro-Michael addition reactions](/preview/png/58458.png)
چکیده انگلیسی
A new and effective organocatalytic system, primary amine derived chiral thiourea catalyst and AcOH/H2O additive, which converts different ketones to γ-nitroketones in high yields (82–99%) and enantioselectivities (90–99%) is described. The transition state geometries for formation of R and S enantiomers in this Michael addition have been calculated and analyzed. It is shown that only one oxygen atom of the nitro group is bound to the thiourea moiety, in juxtaposition to the literature-known working hypothesis which involves a bonding of both oxygens.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 121, Issues 1–2, 15 March 2007, Pages 151–157
Journal: Catalysis Today - Volume 121, Issues 1–2, 15 March 2007, Pages 151–157
نویسندگان
Shengwei Wei, Denis A. Yalalov, Svetlana B. Tsogoeva, Stefan Schmatz,