کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
65628 48398 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cyclotrimerization of alkynes vs. ketone formation in aqueous microemulsion
ترجمه فارسی عنوان
چرخه تولید آلکینها در مقابل تشکیل کتون در میکرو امولسیون آب
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• Cyclotrimerization of water insoluble alkynes in aqueous media.
• Replacement of harmful organic solvents by aqueous microemulsions.
• Elucidation of factors that influence cyclotrimerization in aqueous microemulsions.

In the course of our attempts to develop sustainable conditions for the catalytic organic reactions by replacement of the traditional but environmentally disfavored organic solvents by water, we studied the cyclotrimerizations of alkynes, in aqueous microemulsions. The catalyst for these reactions was the rhodium-trichloride encaged within silica sol–gel. In acidic aqueous media, alkynes can undergo addition of water to form their corresponding ketones. In order to eliminate completely the formation of ketones, relatively low reaction temperatures are required. At higher reaction temperatures, however, buffered microemulsion media is preferable.Cyclotrimerization of alkynes proved to be dependent on the reaction temperatures, the electronic nature of the substrates, the electronic nature of the surfactant and on the hydrophobicity of the sol–gel support. During the cyclotrimerization reaction, the rhodium complex was turned to Rh(0) nanoparticles characterized by TEM measurements.These investigations may be regarded as model studies for the conversion of alkynes into substituted benzenes in water.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 382, February 2014, Pages 93–98
نویسندگان
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