نتایج جستجو برای: reagents
تعداد نتایج: 28929 فیلتر نتایج به سال:
A systematic review of sustainable gold extraction from raw ores using alternative leaching reagents
Drawing on recent experimental and commercial developments, this review reappraises potential substitute leach reagents for cyanide in the gold mining sector. In addition to extraction, application of these processing, pre-treatment purification stages is explored. The main objective here discuss how extraction process can be more sustainable, with a view developing greener leaching reagents.
Aliphatic ,w-dibromides can be converted to the corresponding c,w-di—Grignard reagents; for those members carrying less than four carbon atoms between the functions, special procedures are required. The synthesis, structure and applications of the di-Grignard reagents are discussed; particular emphasis is placed on the structures of the corresponding cyclic dialkylmagnesiums, and on the use of ...
We describe a general catalytic methodology for the enantioselective dearomative alkylation of pyridine derivatives with Grignard reagents, allowing direct access to nearly enantiopure chiral dihydro-4-pyridones yields up 98%. The involves dearomatization in situ-formed N-acylpyridinium salts, employing alkyl organomagnesium reagents as nucleophiles and copper (I) complex catalyst. Computationa...
Organomanganese reagents were prepared by the insertion of magnesium into aryl halides in the presence of MnCl2·2LiCl. These organomanganese reagents smoothly undergo 1,2-addition, acylation, and Pd-catalyzed cross-coupling with various electrophiles. Especially, the oxidative homocoupling of organomanganese reagents was completed in one pot without an additional transition-metal catalyst.
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید