کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1347664 980320 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Divergent enantioselective pathways in the catalytic asymmetric addition of diethylzinc to aldehydes in the presence and absence of titanium tetraisopropoxide
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Divergent enantioselective pathways in the catalytic asymmetric addition of diethylzinc to aldehydes in the presence and absence of titanium tetraisopropoxide
چکیده انگلیسی
The stereochemical outcome of the asymmetric addition of diethylzinc to aldehydes catalyzed by (R,R)-hydrobenzoin can be influenced by the absence or presence of Ti(O-iPr)4. The enantiomeric ratios obtained in the absence of Ti(O-iPr)4 favor the (S)-enantiomer, whereas the ratios obtained from the use of Ti(O-iPr)4 favor the formation of the (R)-enantiomer. The formation of the opposite enantiomers is attributed to the different transition states mediated by either zinc or titanium.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron: Asymmetry - Volume 19, Issue 22, 17 November 2008, Pages 2563-2567
نویسندگان
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