کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10244709 | 47699 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Zwitterion formation: a feasible mechanism for the Pt-catalyzed enantioselective hydrogenation of ketones?
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Zwitterion formation: a feasible mechanism for the Pt-catalyzed enantioselective hydrogenation of ketones? Zwitterion formation: a feasible mechanism for the Pt-catalyzed enantioselective hydrogenation of ketones?](/preview/png/10244709.png)
چکیده انگلیسی
Recently a new mechanism for the enantioselective hydrogenation of (activated) ketones has been suggested, involving a zwitterionic intermediate between the tertiary amine function of the chiral modifier and the keto-carbonyl group of the reactant. The present NMR study indicates that the mechanistic model is probably based on erroneous interpretation of the experimental data; the NMR spectra that have been reported for zwitterion formation may arise from an aldol addition product between the ketone and solvent acetone. Steric effects and the regioselectivity of the hydrogenolysis of the hypothetic zwitterionic intermediate also exclude this mechanism for ketone hydrogenation on Pt.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 234, Issue 1, 15 August 2005, Pages 242-246
Journal: Journal of Catalysis - Volume 234, Issue 1, 15 August 2005, Pages 242-246
نویسندگان
Elisabeth Orglmeister, Tamas Mallat, Alfons Baiker,