کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
66320 48425 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sulfonated carbon/silica composite functionalized Lewis acids for one-pot synthesis of 1,2,4,5-tetrasubstituted imidazoles, 3,4-dihydropyrimidin-2(1H)-ones and for Michael addition of indole to α,β-unsaturated ketones
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Sulfonated carbon/silica composite functionalized Lewis acids for one-pot synthesis of 1,2,4,5-tetrasubstituted imidazoles, 3,4-dihydropyrimidin-2(1H)-ones and for Michael addition of indole to α,β-unsaturated ketones
چکیده انگلیسی

Novel Lewis acid catalysts were prepared from sulfonated carbon/silica composites derived from starch and silica by treatment with Lewis acids AlCl3, SbCl3, Bi(NO3)3, ZnCl2 and FeCl3. The catalytic activity of the Lewis acids was evaluated for one-pot synthesis of 1,2,4,5-tetrasubstituted imidazoles, 3,4-dihydropyrimidin-2(1H)-ones and for Michael addition of indole to α,β-unsaturated ketones. Different Lewis acids were investigated with a view to select the most effective solid Lewis acid for organic synthesis. All the Lewis acid catalysts were characterized by FTIR, XRD and AAS analysis and the most active catalyst CSC-Star-SO3-AlCl2 was also characterized by TGA, SEM and TEM.

Novel sulfonated carbon/silica composite functionalized Lewis acids viz. CSC-Star-SO3-AlCl2, CSC-Star-SO3-SbCl2, CSC-Star-SO3-FeCl2, CSC-Star-SO3-Bi(NO3)2 and CSC-Star-SO3-ZnCl have been prepared and their catalytic activity was evaluated for the one-pot synthesis of 1,2,4,5-tetrasubstituted imidazoles, 3,4-dihydropyrimidin-2(1H)-ones and for Michael addition of indole to α,β-unsaturated ketones. CSC-Star-SO3-AlCl2 was found to be the most active catalyst for catalyzing these reactions.Figure optionsDownload high-quality image (84 K)Download as PowerPoint slideHighlights
► Sulfonated carbon/silica functionalized Lewis acids were prepared from starch.
► Different Lewis acids were tested with a view to select the most active solid acid.
► Lewis acid catalysts were characterized by FTIR, XRD and AAS analysis.
► Most active catalyst CSC-Star-SO3-AlCl2 was also characterized by TGA, SEM and TEM.
► CSC-Star-SO3-AlCl2 was found to be recyclable under the reaction conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 352, January 2012, Pages 75–80
نویسندگان
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