ChemInform Abstract: Sulfonamidoglycosylation of Methyl Glycosides Employing Perchloric Acid Supported on Silica Gel.

ChemInform ◽  
2009 ◽  
Vol 40 (3) ◽  
Author(s):  
Pedro A. Colinas ◽  
Nicolas A. Nunez ◽  
Rodolfo D. Bravo
Keyword(s):  
Silica Gel ◽  
Perchloric Acid

Perchloric Acid Adsorbed on Silica Gel: An Efficient Heterogeneous Reusable Catalyst for Synthesis of 1,5-Benzodiazepines.

ChemInform ◽  
2006 ◽  
Vol 37 (6) ◽  
Author(s):  
Biswanath Das ◽  
Majjigapu Ravinder Reddy ◽  
Ravirala Ramu ◽  
Kongara Ravinder Reddy ◽  
Madamanchi Geethangili
Keyword(s):  
Silica Gel ◽  
Perchloric Acid ◽  
Reusable Catalyst

Comparison of Different Heterogeneous Catalysts for the Estolides Synthesis from Oleic Acid

2011 ◽  
Vol 364 ◽  
pp. 288-292 ◽  
Author(s):  
Nor Asikin Mohamad Nordin ◽  
Nadia Farhana Adnan ◽  
Noraini Hamzah ◽  
Wan Nor Roslam Wan Isahak ◽  
Alifee Ayatillah ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Silica Gel ◽  
Perchloric Acid ◽  
Heterogeneous Catalysts ◽  
Addition Reaction ◽  
Xps Analysis ◽  
Reaction Products ◽  
Final Conversion ◽  
Direct Addition ◽  
Chromatographic Peaks

Different catalysts, namely various loading of perchloric acid on various supports; HClO4/silica (SiO2), HClO4/silica gel (SG) and HClO4/alumina (Al2O3) were tested for the direct addition reaction of oleic acid (OA) to form estolide compounds. The reactions were carried out under vacuum (2 mBar) for 10 hours at 70 °C under solvent-less conditions. LC-MS ToF of reaction products results showed chromatographic peaks for the presence of two new estolide compounds, oleic-oleic monoestolide acid (m/z563.51, as [M-H]-), and oleic-oleic diestolide acid (m/z845.77 [M-H]-). The optimum loading of HClO4for every support are 15 wt.% HClO4/SiO2(SiO215), 10 wt.% HClO4/SG (SG10) and 35 wt.% HClO4/Al2O3(Al2O335). The SG10 turned out to be the best catalyst, achieving a final conversion of 97.5 % with 79.8 % selectivity to oleic-oleic monoestolide acid and 17.7 % selectivity to oleic-oleic diestolide acid. The activity and selectivity of the SG10 have been investigated and compared with homogeneous HClO4. The optimum catalysts for every support were characterized by XPS analysis, BET, TEM and TPD-NH3.

Microwave-Assisted, Rapid, Solvent-Free Aza-Michael Reaction by Perchloric Acid Impregnated on Silica Gel

2009 ◽  
Vol 39 (22) ◽  
pp. 3982-3989 ◽  
Author(s):  
Surya Prakash Singh ◽  
T. Vijaya Kumar ◽  
M. Chandrasekharam ◽  
L. Giribabu ◽  
P. Yella Reddy
Keyword(s):  
Silica Gel ◽  
Perchloric Acid ◽  
Michael Reaction ◽  
Solvent Free ◽  
Microwave Assisted
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