کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9605606 | 44098 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photochemistry of 2â²-halobenzanilides: reaction mechanism
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The UV photolysis of acetonitrile solutions of 2â²-halobenzanilide were followed by UV-spectroscopy, HPLC and time resolved laser flash photolysis. The chemical yields of the major products produced from the irradiation with medium pressure Hg-lamp were measured. The chemical yields of the photosubstitution product ranged from 3 to 45% (the yield was 3% when the starting material was a solution of 2â²-chlorobenzanilide in CH3CN and was 45% when the starting material was a solution of 2â²-bromobenzanilide in 10% 1 mol NaOH:CH3CN). The quantum yield measurements of the photoproducts were carried out in N2 and O2 atmosphere in the presence and absence of OH ions. The results showed an enhancement in the yield of the photosubstituted product in the presence of OH ions and in switching from chloro- to bromo-substituent. The presence of O2 lowered the yield of photosubstitution and photoreduction products. Time resolved studies showed two peaks, one appeared at 395 nm and the second centred around 315 nm. These two peaks were identical in both cases of 2â²-halobenzanilides (halo = Cl or Br).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 172, Issue 3, 5 June 2005, Pages 258-268
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 172, Issue 3, 5 June 2005, Pages 258-268
نویسندگان
Ahmed M. Mayouf,