Synthesis of Unsymmetrical Ethers Catalysed by Polyvinyl Sulfuric Acid & PVSA / Nano RH SiO2 as a Novel Solid Acid Nanocomposite

Journal of Nanoanalysis

مقاله 2، دوره 4، شماره 3، آذر 2017، صفحه 189-195   

نوع مقاله: Original Research Paper

شناسه دیجیتال (DOI): 10.22034/jna.2017.539361

نویسندگان

Roya Moeinzadeh^{* 1}؛ Hadi Asareh²؛ Ali Reza Kiasat²

¹Department of Chemistry, Dezful Branch, Islamic Azad University, Dezful, Iran

²Chemistry Departments, College of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran

چکیده

The methodology involves preparing polyvinyl sulfuric acid as a solid acid by simple mixing of
polyvinyl alcohol with chlorosulfonic acid in CH2Cl2 at room temperature. The catalytic ability of
the solid acid was investigated for the facile conversion of benzylic alcohols to the unsymmetrical
ethers with aliphatic alcohols in the presence of the solid acid. Results show that the solid acid is
an appropriate catalytic agent for these condensation reactions. The silica was also extracted from
low-cost rice husk and the amorphous silica gel nanoparticles were prepared with sol- gel method.
The polyvinyl sulfuric acid was supported on nano rice husk silica. Then the catalytic effect of this
system was investigated for synthesis of unsymmetrical ethers which consisted of a combination of
high acidic power for this solid acid and high- surface area of nanoparticles. Results show that totally
catalytic effect of polyvinyl sulfuric acid supported on nano silica is more suitable than polyvinyl
sulfuric acid. The reason for this is in its ability to produce the end products in shorter reaction times
while having high isolated yields.

کلیدواژه‌ها

Silica nanoparticles؛ Polyvinyl sulfuric acid؛ Unsymmetrical ethers؛ Sol-gel method؛ Rice husk