کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5218370 1383325 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polymer-supported oligoethylene glycols as heterogeneous multifunctional catalysts for nucleophilic substitution
ترجمه فارسی عنوان
گلیکول های الیگو اتیلن حمایت شده از پلیمر به عنوان کاتالیزور های چند منظوره ناهمگن برای جایگزینی نوکلئوفیلی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی

We investigated various structurally modified polystyrene-supported oligoethylene glycols (PSoligoEG) in order to find an optimized PSoligoEG by examining the dependence of their catalytic activity on the oligoethylene glycol chain length and the loading level of the oligoethylene glycol portion on the polystyrene support. From this, we found that the PSpentaEG with the highest pentaEG loading had the best catalytic efficacy among the various PSoligoEGs in nucleophilic substitutions. This PSpentaEG absorbed both polar aprotic solvents, such as DMSO, DMF, and acetonitrile, as well as protic media, such as tert-amyl alcohol and aqueous acetone, and swelled considerably. To expand the scope of the PSpentaEG as a heterogeneous catalyst for diverse nucleophilic displacement reactions, we carried out the thioacetoxylation, nitrilation, azidation, iodination, bromination, chlorination, and methoxylation using the corresponding alkali metal salts in the presence of PSpentaEG in various solvents; all the reactions proceeded smoothly, affording the corresponding products in high yields.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron - Volume 69, Issue 17, 29 April 2013, Pages 3577-3583
نویسندگان
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