کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617669 | 49176 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Claisen rearrangement with a novel solid superacid UDCaT-5: Atom economical and selective conversion of allyl-4-methoxyphenyl ether into 2-allyl-4-methoxyphenol
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کلمات کلیدی
UDCaT-5Solid acids - اسیدهای جامدHeteropoly acids - اسیدهای هیدروپولیکSulfated zirconia - زیرکونیا سولفاتSolid superacids - سوپر اسیدهای جامدHexagonal mesoporous silica - سیلیکا مزوپور شش ضلعیKinetics - سینتیک (جنبش شناسی) mesoporous materials - مواد مزوپورMechanism - مکانیسم یا سازوکارClaisen rearrangement - نوآرایی کلایزن، بازآرایی کلایزن
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Claisen rearrangement with a novel solid superacid UDCaT-5: Atom economical and selective conversion of allyl-4-methoxyphenyl ether into 2-allyl-4-methoxyphenol Claisen rearrangement with a novel solid superacid UDCaT-5: Atom economical and selective conversion of allyl-4-methoxyphenyl ether into 2-allyl-4-methoxyphenol](/preview/png/9617669.png)
چکیده انگلیسی
The Claisen rearrangement of allyl aryl ethers provides a convenient route to obtain allyl phenols which are precursors to a variety of natural products. All uncatalyzed Claisen rearrangements are energy intensive requiring temperatures above 200 °C whereas those using homogeneous acid catalysts leads to a loss in yield and selectivity, in addition to pollution problems. In the current work, the Claisen rearrangement of allyl-4-methoxyphenyl ether to 2-allyl-4-methoxyphenol was investigated at 90 °C using chlorobenzene as a solvent over several solid acid catalysts such as dodecatungstophosphoric acid/hexagonal mesoporous silica (HMS), Cs2.5H0.5PW12O40/K10 clay, sulfated zirconia and a new mesoporous solid superacid UDCaT-5. 2-Allyl-4-methoxyphenol is used in perfumes, flavors, soaps, detergents, air fresheners, and cosmetic materials. UDCaT-5 was found to be superior, robust and recyclable and 100% selective. A complete theoretical and experimental analysis is also presented. This is a 100% atom economical and efficient process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 83, Issues 1â3, 1 September 2005, Pages 357-364
Journal: Microporous and Mesoporous Materials - Volume 83, Issues 1â3, 1 September 2005, Pages 357-364
نویسندگان
Ganapati D. Yadav, Sharad V. Lande,