کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
49697 46760 2016 4 صفحه PDF ندارد دانلود رایگان
عنوان انگلیسی مقاله
Non-covalent immobilization of chiral copper complexes on Al-MCM41: Effect of the nature of the ligand
ترجمه فارسی عنوان
بی‌حرکتی غیرکووالانسی مجموعه های مس کایرال بر روی Al-MCM41: اثر ماهیت لیگاند
کلمات کلیدی
کاتالیزم نامتقارن؛ کاتالیزورهای امولسیون شده؛ مواد مزوپور؛ بیس (اگزازولین)؛ فلز مس؛ Cyclopropanation
Asymmetric catalysis; Immobilized catalysts; Mesoporous materials; Bis(oxazolines); Copper; Cyclopropanation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• Chiral box- and azabox-Cu complex were non-covalently immobilized on Al-MCM41.
• Cu(OTf)2 was first impregnated by incipient wetness and then treated at 450 °C.
• Final modification with box and azabox leads to stable immobilized complexes.
• Azabox-Cu complexes were more stable upon recycling up to 5 times.

Cu-Al-MCM41, prepared by deposition of copper(II) triflate with incipient wetness impregnation and thermal treatment under air flow, can be modified with different chiral ligands of the bis(oxazoline) family. The efficiency of the supported chiral catalysts in the enantioselective cyclopropanation of styrenes with ethyl diazoacetate depends on the nature of the ligand. The azabis(oxazolines) perform much better than the bis(oxazolines) and give stable catalysts that can be used for at least five consecutive runs, with productivities that can reach values close to 1000 molecules of cyclopropane per copper site. The best enantioselectivities obtained with these catalysts are in the range of 60–70% ee in the reaction at 90 °C.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Communications - Volume 83, 5 August 2016, Pages 74–77
نویسندگان
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