کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10244552 | 47694 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New immobilized chiral Mn(III) salen complexes on pyridine N-oxide-modified MCM-41 as effective catalysts for epoxidation of nonfunctionalized alkenes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: New immobilized chiral Mn(III) salen complexes on pyridine N-oxide-modified MCM-41 as effective catalysts for epoxidation of nonfunctionalized alkenes New immobilized chiral Mn(III) salen complexes on pyridine N-oxide-modified MCM-41 as effective catalysts for epoxidation of nonfunctionalized alkenes](/preview/png/10244552.png)
چکیده انگلیسی
We prepared new chiral Mn(III) salen complexes 1â²-4â² immobilized on pyridine N-oxide-modified MCM-41 through the axial coordination. Epoxidation of styrene and 4-chlorostyrene with the use of these complexes as catalysts in the presence of NaOCl was found to proceed enantioselectively (ee, 62-69%) at 0â°C in 8-12 h, which is a significantly higher enantioselectivity than that observed for their homogeneous counterparts (ee, 36-51%). These catalysts were also effective for the relatively bulkier alkenes, such as indene and 2,2-dimethylchromene, and have shown a reactivity (82-98%) and an enantioselectivity (69-92%) similar to those observed for their homogeneous system. The catalysts could be recycled several times without loss of performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 235, Issue 1, 1 October 2005, Pages 28-34
Journal: Journal of Catalysis - Volume 235, Issue 1, 1 October 2005, Pages 28-34
نویسندگان
Rukhsana I. Kureshy, Irshad Ahmad, Noor-ul H. Khan, Sayed H.R. Abdi, Surendra Singh, Preti H. Pandia, Raksh V. Jasra,