Synthesis and Application of Schiff Base Mn(III) Complexes Containing Crown Ether Rings as Catalysts for Oxidation of Sulfides by Oxone
محل انتشار: بیست و ششمین سمینار شیمی آلی ایران
سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 378
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شناسه ملی سند علمی:
ISOC26_172
تاریخ نمایه سازی: 2 شهریور 1398
چکیده مقاله:
Two new crowned Schiff base manganese(II) catalysts 1 and 2 were synthesized and characterizedby IR spectroscopy and CHNS microanalysis. A combination of Oxone, as oxidantand these catalysts in CHCl3 was used for the oxidation of various sulfides to sulfones andsulfoxides. Compared with the crown free catalysts, the prepared catalysts in this research exhibitedexcellent efficiency. Additionally, among the prepared catalysts, catalysts 1, containingpyridine ring, showed better catalytic activity. we think the presence of crown rings bondedto these complexes would not only increase the solubility of the oxidant (KHSO5) in theorganic phase, but also may facilitate bringing the KHSO5 into the vicinity of the manganese[1], leading to faster oxidation of manganese(III) to oxo manganese(V) which is a better oxidantthan KHSO5 [2]. The addition of pyridine improved the chemical yields of all the reactionscatalyzed by catalyst 2, but the reaction times of catalyst 1 remained nearly constant. Itis concluded that the additional N atom on the bridge groups of catalyst 1 itself might play therole of axial base, therefore, the presence of pyridine as an external axial base slightly improvesthe corresponding reaction times in this case [3].
نویسندگان
Sanaz Naderi
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
Reza Sandaroos
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran