کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188392 | 1381154 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Novel vanadium catalyst system with tartaric acid salts for highly selective asymmetric oxidative coupling polymerization
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The asymmetric oxidative coupling polymerization (AOCP) of 2,3-dihydroxynaphthalene (DHN) with a novel catalyst system, oxovanadium(IV) stearate in the presence of the sodium or lithium salt of tartaric acid, under an O2 atmosphere was carried out. For example, the polymerization with a catalytic amount of the d-(â)-tartaric acid disodium salt in THF at room temperature for 48 h followed by acetylation of the hydroxyl groups gave a methanol-insoluble polymer in a 40% yield, which showed the highest specific rotation value ([α]D) of â223 among the polymers so far obtained by the AOCP of DHN. The enantioselectivity during the polymerization was estimated to be an 88% enantiomeric exess (S).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 22, 19 October 2007, Pages 6565-6570
Journal: Polymer - Volume 48, Issue 22, 19 October 2007, Pages 6565-6570
نویسندگان
Soichiro Murakami, Shigeki Habaue, Hideyuki Higashimura,